it became warm how to use recirculation correctly in vw polo sedan so that the glasses do not sweat

Veronica Recirculation is not designed to combat glass fogging.

Victor first understand what this term means. and everything will become intuitive.

Inna, in order not to fog up, it is necessary to expose the air intake from the street.

Lilia In order to avoid sweating glasses when recirculation is on, it is imperative to turn on the air conditioner. It will dry the air. I often travel like this in the summer, but no smells come from the street, and the condo cools better, because every time you don't have to cool new portions of warm air from the street. And if without kondeya, then the glass will quickly fog up.

Tags: Why does the air conditioner immediately turn on on the Polo sedan

A / C compressor clutch does not engage. There is no mass on the A / C compressor. VW Golf 4, Passat, Polo, Bora.

Dec 5. 2012 - The air conditioner turns on itself: ... It turns on almost immediately when the heater is turned on, apparently in order for the exhaust gases to ...

My review of the "Polo sedan"

Six months have passed since the purchase of the car - VW Polo sedan. Mileage 5800 kilometers.

Russian Volkswagen
As you know, the Polo sedan was developed specifically for Russian market, and assemble it also in Russia, at the VW plant in Kaluga. The build quality is excellent. If on the forums about other foreign cars assembled in Russia you can find reviews that there are shoals like protruding burrs or loose parts in the received cars here and there, then everything here is done very neatly and smoothly. No differences from the "European" Polo hatchbacks.
However, I still found the assembly marriage, and what a one! As soon as the spring rains and slush began, the most unpleasant thing appeared: in damp weather, when the air conditioner was turned on from somewhere from under the glove compartment, about 100 ml of water was injected onto the front passenger mat under pressure. The situation repeated itself periodically, apparently as water was collected somewhere inside the car.
In May I went to the official service, Avilon. They checked the drainage (it turned out to be in order), poured water on the car at the car wash - they did not find anything, the effect did not repeat itself (I suspect, they didn’t pour it much). They sympathized, inviting to call in the rain, as the water will again be on the rug. At home, having scratched his turnip, he decided not to wait for the weather from nature. After all, there cannot be only me such a defect for tens of thousands of machines assembled on the conveyor? I sent a message through the form on the vw.ru website to the Russian Volkswagen with a description of the problem and asked to direct me to a service that has experience in eliminating such malfunctions.
Four days later I got a call from Volkswagen and said that the same Avilon would fix the defect - they would give him appropriate recommendations. Then they called from the service, invited to call in. Interestingly, a Volkswagen representative also came to service my car. As a result, it turned out that when assembling my car at the factory they forgot to glue the seam that goes under the plastic apron, on which the "wipers" lie. Water seeped through this seam causing the problem described. The seam was sealed, and - now there were two heavy rains - everything seems to be in order.
The service representatives swore and swore that the defect was indeed very rare. In general, this can be believed, since Avilon is one of the largest VW centers in Moscow, and with their volumes, they would certainly face this problem if it were more or less widespread. In addition, at the request of a Volkswagen representative, the place of repair was photographed - obviously, this is not done with a usual malfunction, organizational conclusions will follow.
Otherwise, there are no problems. Even the bulbs didn't burn out.
Engine and transmission
One engine is installed on the Polo sedan - a regular aspirated 1.6 liter and 105 hp, and a manual or automatic 6-speed gearbox (I have the last one). When I was choosing which car model to buy, this engine seemed frivolous to me: Koreans, for example, in Hyundai solaris and Kia rio they put engines of the same volume, but with a capacity of 122 forces. But it turned out that the Korean "horses" are somehow deadlier than the German ones: their more numerous herd develops almost the same torque (155 Nm versus 153 Nm for the Polo), and at 4200 rpm, while the Polo - at only 3800 rpm ...
It is believed that with the "automatic" you need to put more powerful engines, that way 150 forces. Otherwise, like, "does not go". Nonsense! 105 h.p. Polo in combination with an automatic transmission allows you to drive the car quite effectively. Changes, overtaking, sharp jerks into the formed gaps in traffic jams - no problem. And this is even in the simple operating mode of the box, but there is also a sports one ("S"), in which the gears are shifted up more slowly and downward - faster, so this is generally a fire. In both modes, the reaction to the gas pedal is adequate: you press medium - the car immediately picks up speed, you press "on the floor" ("kickdown") - a pause of 1-1.5 seconds, downshift and a jerk forward. There are no sensations like "not going" and is not close.
By the way, who doubts what to choose when buying a car - a mechanic or an automatic - for me personally, a mechanic is now (Polo is my first car with a gun) is dead. The automatic transmission is just incomparably more comfortable. And conversations like “I like to feel the car” are, in my opinion, from the category of conversations about “warm tube sound”. On automatic box VW, by the way, has a manual mode - you pull the handle, changing gears up and down. Well I tried it, well it works. But why? I never used it anymore.
Comfort and more
The relative budget of the car imposes certain restrictions. Noise isolation is weaker than that of the next class car - "Jetta", the sound of the engine is not so muffled. But, nevertheless, the noise in the cabin is quite acceptable, you can talk and hear the interlocutor at 120 kilometers per hour without straining.
The desire of Volkswagen marketers to emphasize the differences between the Polo and other, more expensive models sometimes makes it ridiculous (sadly). For example, I have such expensive options in my car as climate control, leather multifunction steering wheel, heating windshield, ESP system, side airbags. But on the other hand, there is no lighting lamp for the rear passengers (after all, a penny plafond!). Also here they saved on, again, a penny illumination of the glove compartment (it doesn't matter to me, I don't use it, but people howl on the forums). Trunk lighting (if such a booze has already gone) is.
The head unit and acoustics were very pleased. I, of course, am not a maniac (see "warm tube sound"), but somehow there is no desire to improve. Here, however, on some songs, where the low frequencies are specific, the door trim begins to resonate. Probably, it is necessary to make noise insulation after all.
The stove is weak. At temperatures below -10, the interior warms up for a long time: only after 15 minutes you can be in it without a hat, and after another 15 it becomes quite comfortable. But this is a drawback of many cars, including much more expensive ones, so this evil is inevitable.
In general, the impressions are mostly positive.

What should be done with air conditioning in winter? | All-Russian club ...

Apr 4 2015 - All-Russian club Volkswagen polo sedan ... The air conditioner does not work if the outside temperature is below 4 degrees, even if you turn it on, it will not work, so ... my kander does not turn on in winter. .... I tried to sweat the window in the winter, it didn't sweat without the kondeya, turned it on immediately.

1.1.4. Transmission control. 1.1.5. Outdoor lighting switches, headlight beam dimmers, steering column switches, dashboard switch block. 1.1.6. Heating, ventilation and air conditioning control unit, rear-view mirrors, interior lighting. 1.2. Safety precautions during repair. Volkswagen Forum

1.1.6. Volkswagen Polo. Heating, ventilation and air conditioning control unit, rear-view mirrors, interior lighting.

CONTROL UNIT FOR HEATING, VENTILATION AND AIR CONDITIONING

The car, depending on the configuration, can be equipped with a manual heating, ventilation and air conditioning system and automatic climate control in the cabin - a climate control system. Air can enter the passenger compartment through the central and side vents located on the instrument panel, as well as through the air ducts to the feet of the driver and passengers.
The cabin air filter prevents dust and airborne particles from entering the vehicle interior.
Air escapes from the passenger compartment into the trunk through the ventilation grilles located in the shelf under rear window... Air exits from the trunk through the grilles under the rear bumper.

Side deflector of the heating, ventilation and air conditioning system: 1 - lever for changing the direction of air flows; 2 - regulator of the intensity of air intake.

Central deflectors of the heating, ventilation and air conditioning system.
The HVAC control unit is located in the center console of the instrument panel.

Heating, ventilation and air conditioning control unit (on vehicles with manual control of the system): 1 - air temperature regulator; 2 - switch for operating modes of the heater fan; 3 - air flow distribution regulator; 4 - air conditioner switch button; 5 - button for the air recirculation mode switch.
By turning the knob of the air temperature regulator 1, we change the temperature of the air entering the passenger compartment. To increase the air temperature, turn the regulator knob to the right, to the red sector of the scale, and to decrease the air temperature, to the left, to the blue sector. The intensity of air supply to the passenger compartment is regulated by turning the knob of the fan operating mode switch 2. In this case, one of the four fan speeds is switched on. Turning the switch knob clockwise increases the fan speed. The air flow into the passenger compartment can be adjusted. The flow distribution regulator 3 sets the following directions of air flow in the passenger compartment:
- the air flow through the vents in the dashboard enters the upper part of the car;
- the air flow enters only the area where the legs of the driver and passengers are located;
- the air flow enters the leg area, as well as to the windshield blower grilles;
- the air flow enters only the windscreen deflector grilles.
To turn on the air recirculation mode, press the switch button 5. At the same time, the indicator in the button lights up. To turn it off, press the button again. Recirculated air mode (stopping the supply of outside air to the passenger compartment) is recommended to use when it is necessary to quickly decrease or increase the air temperature in the passenger compartment, as well as when driving in dusty areas or in dense traffic, in order to avoid dust, exhaust gases and unpleasant odors entering the passenger compartment.
It is not recommended to use the recirculation mode for a long time, as this can lead to an increase in air humidity in the passenger compartment and fogging of the windows.
To turn on the air conditioner, press the button 4 of the switch with the engine running and the heater fan on. At the same time, the indicator in the button lights up.
Turn off the air conditioner by pressing the button again. The air conditioner also turns off when the heater fan is turned off. On long climbs or in heavy city traffic, the operation of the air conditioner can cause the engine to overheat. Therefore, if the coolant temperature has exceeded the permissible value, the air conditioner should be turned off. If the car is parked in direct sunlight, open the windows and ventilate the interior before turning on the air conditioner. To avoid fogging the windows in rainy weather, you need to set the maximum fan speed, turn on the air conditioner and turn the air distribution regulator to the position, while the air temperature regulator is recommended to be installed at the border of the blue and red zones.
After long-term parking in hot weather in the sun, when you turn on the air conditioner, do not direct the flow of cold air to the windshield to avoid cracking.
If there is no need to use the air conditioner, then it must be turned on every month for a few minutes, and even during the winter period of operation (during thaws).
This helps to retain the lubricant on the compressor parts and seals, which prolongs the life of the air conditioning system.
The car can be equipped with a climate control system that automatically controls the temperature, quantity and distribution of air flows and adjusts them depending on the conditions set by the driver, as well as weather conditions. At the same time, the possibility remains manual control system.
The climate control unit is located on the center console of the instrument panel.

Climate control control unit: 1 - fan speed regulator; 2 - information display; 3 - air temperature regulator; 4 - button for turning on the air conditioner; 5 - button for switching on the air recirculation mode; 6 - buttons for distribution of air flows in the cabin; 7 - button for switching on the mode of removing frost / moisture from the windshield; 8 - system power button automatic control microclimate.

Single press on the button AUTO turns on automatic mode, in which the preset temperature in the passenger compartment will be maintained automatically. When you press any of the climate control buttons, the automatic mode changes - the function activated by the button will be controlled manually, the rest of the functions - automatically. The air conditioner is switched on and off by pressing button 4. When the air conditioner is on, the display will show AC... The fan speed is adjusted by turning knob 1. The fan settings are shown as dashes on the display. The directions of air flows in the passenger compartment are set by buttons 6. Button 5 is used to select the mode of supplying outside air to the passenger compartment and recirculating air when the supply of outside air to the passenger compartment is cut off. To remove frost / moisture from the windshield, use button 7. When this button is pressed, the air conditioner will be automatically turned on, and the air recirculation is turned off. In this case, the fan speed and the temperature in the passenger compartment are automatically controlled.

REAR VIEW MIRRORS

Depending on the equipment, the vehicle can be fitted with manually operated or electrically driven and heated exterior mirrors. The manually operated outside rearview mirror is adjusted from the passenger compartment by turning the mirror handle. To adjust the position of the power mirrors ...

… There is a regulator on the armrest of the driver's door.
To adjust the position of the left or right exterior mirrors, move (with the ignition on) the knob of the regulator, respectively, to the position L or R... Then, tilting the handle left and right and back and forth, we change the position of the mirror. To turn on the mirror heating, move the regulator knob to position 1.
In the event of a malfunction of the electric drive, the position of the mirror can be adjusted manually by pressing on the edges of the mirror element. The position of the interior rearview mirror can be adjusted horizontally and vertically by rotating the mirror housing on a hinge. There are two modes for the position of the internal mirror: "day" and "night". To reduce the blinding effect of the headlights of cars moving behind, we move the mirror to the "night" position ...

... by moving back the lever located at the bottom of the case.
This changes the angle of reflection of the mirror and the dazzle effect is reduced.
It is not recommended to place objects on the shelf in front of the rear window that could reduce the field of view through the mirror.

INTERIOR LIGHTING

In the upholstery of the headliner of the car, a plafond is installed, in which the interior lamp and two directional lamps are located.

Interior lighting plafond: 1 - directional lamp switch button; 2 - key switch for interior lighting lamps and directional light; 3 - section of the directional light lamp; 4 - section of the interior lighting lamp.
When you press button 1 in the plafond, the corresponding directional lamp lights up. When the button is pressed again, the lamp goes out.
If the button 2 is not pressed (middle position), the lamps for interior lighting and directional light will automatically light up when the car is unlocked, one of the doors is opened or the key is removed from the ignition.
The lighting will turn off a few seconds after all doors are closed or immediately after turning on the ignition. When you press the right edge of key 2, all lamps in the plafond light up. To turn off the lamps in the plafond, press the left edge of the button 2. In this case, the directional light can be turned on by pressing the corresponding button 1.

Schematic diagram of the movement of air flows in the Polo sedan heating system, air conditioning and ventilation: 1 - deflectors for blowing the windshield; 2 - dampers for the distribution of air flows to the windscreen deflectors and the dashboard deflectors; 3 - dashboard deflectors; 4 - air ducts for heating the zone of the driver's and passengers' feet; 5 - damper for air flow distribution to the instrument panel deflectors and heating ducts for the driver's and passengers' feet; b - heater radiator; 7 - cabin air filter; 8 - damper of the air recirculation system; 9 - air intake box; 10 - air intake in the passenger compartment; And - fan impeller; 12 - fan motor; 13 - air conditioner evaporator; 14 - drainage hole for condensate drainage; 15 - damper of the temperature regulator; 16 - the body of the heating and air conditioning system block

The heating, air conditioning and ventilation system is a single complex that provides the most comfortable conditions in the car, regardless of weather conditions and driving mode. The system includes a heater (increases the air temperature under any operating modes of the system), an air conditioner (reduces the temperature and humidity of the air), an air blower (fan) and air ducts with a filter (provides air exchange in the cabin, purifies the air from dust), as well as a control unit ( controls all elements of the system to obtain the set comfort parameters).

The car is equipped with a liquid-type interior heater.
The heater radiator is combined with the engine cooling system by two hoses running through engine compartment.

The radiator is housed in a plastic casing of the climate unit, installed under the central part of the dashboard. The main units of the heater:

Heat exchanger (radiator) 6 of the heater, designed to heat the air entering the passenger compartment with the heat of the engine cooling fluid;

fan (air blower) 11;

For clarity, shown with the air inlet and air intake ducts removed.

The electric motor 12 of the fan with excitation from permanent magnets, providing an adjustable supply of external air to the dampers of the heater and air conditioner. To obtain different values ​​of the fan speed, a block of additional resistors is installed in the electric motor power supply circuit;

Flap 15 of the temperature regulator of the air coming from the heater to the passenger compartment. The amount of air passing through the heat exchanger of the heater and outside air passing bypassing the heat exchanger depends on the change in its position;

Dampers 2 for the distribution of air from the heater through the air ducts to the passenger compartment or for blowing the windshield.

FEATURES OF THE AIR CONDITIONING DEVICE

On Volkswagen cars Polo sedan a compressor-type air conditioning system was installed. The heater units and the heat exchanger of the air conditioner evaporator are arranged in one block. The controls for the air conditioning system are located on the panel, which is common with the controls for the heater.

The compressor is mounted on the engine block and driven by a poly V-belt. The compressor circulates the refrigerant in the system. The compressor shaft is mounted in an aluminum front cover of the housing on bearings and is sealed on the side of the drive pulley with an oil seal. The compressor drive pulley is mounted on a double-row ball bearing and rotates constantly when the engine is running. Torque is transmitted from the pulley to the compressor shaft through the driven disc.

Schematic diagram of refrigerant movement in the air conditioning system: 1 - combined pressure sensor; 2 - pipeline section high pressure; 3 - receiver-dryer; 4 - service valve of the high pressure line; 5 - condenser (air conditioner radiator); b - fan of the condenser and radiator of the cooling system; 7 - air conditioner compressor; 8 - section of the low pressure pipeline; 9 - service valve of the low pressure line; 10 - heater fan; And - the evaporator; 12 - thermostatic valve

If the system is in good working order, when the air conditioner is turned on, a click is heard - this is the clutch pressure plate, under the action of an electromagnet, engages with the drive pulley, and the compressor rotor begins to rotate.

But during the operation of the air conditioner, the following compressor malfunctions may occur.

1. If, when the air conditioner is off, the clutch emits during rotation extraneous sounds, it heats up or there is a burning smell, then, probably, its bearing began to collapse. In this case, the bearing must be replaced. In some advanced cases, it may be necessary to replace the compressor clutch assembly or its component parts.

2. If, after turning on the air conditioner, a click is not heard, then the following malfunctions are possible:

A refrigerant leak has occurred and the control system is blocking the activation of the compressor;

The pressure sensor in the system is out of order;

Malfunctions in the electrical circuits of the control system;

The winding of the coil of the clutch electromagnet is burnt out;

The engine control unit for any reason ( heat engine coolant, high revs engine) blocked the inclusion of the compressor.

3. If the clutch rotates easily and freely, but when the air conditioner is turned on, extraneous noises are clearly audible or even the engine stalls, then most likely it is jammed

Compressor. The internal pumping part of the compressor cannot be repaired. In this case, the compressor will have to be replaced.

4. And the last, most unpleasant option. The click is heard, the clutch easily rotates the compressor shaft, and there is no cooling of the air in the cabin. In this case, the compressor runs idle, pumping nothing. Only an experienced specialist with special control and diagnostic equipment can determine this malfunction.

The most accurate determination of the cause of the malfunction can be after a complete diagnosis in a specialized service center for the repair of car air conditioners.

An emergency pressure relief valve is installed in the lower part of the rear compressor cover. In the event of an increase in pressure in the system in the event of a pressure sensor failure or other abnormal situations, when the set maximum pressure is exceeded, the valve membrane collapses and part of the refrigerant is thrown out into the street. As a rule, the safety valve after this does not have sufficient tightness. Therefore, after eliminating the causes that caused the increase in pressure and discharge of the refrigerant, the valve must be replaced.

When the valve is triggered, the refrigerant is suddenly ejected in strong jets in all directions. To prevent injury to people, it was closed with a cap.
The condenser (air conditioner radiator) of the multi-flow type is located in front of the radiator of the engine cooling system. It is attached with brackets to the radiator of the cooling system. Condenser honeycombs are made of flat thin-walled aluminum tubes with internal longitudinal baffles for rigidity and external fins to improve heat transfer. Aluminum tanks, with flanges for connecting pipelines and receiver. The tanks are divided into sections along the height, therefore, passing through the condenser, the refrigerant flow changes direction several times. The condenser condenses the vapors of the refrigerant compressed by the compressor and removes the resulting heat into the ambient air.

When the air conditioner is turned on, the engine control unit turns on the power circuit for the electric fan of the engine cooling radiator, which improves heat transfer in the condenser and reduces the pressure in the air conditioning system.

At least once a year, preferably before the start of summer operation, flush the fins A of the condenser from adhering dirt, dust and anti-icing agents B. This will improve heat transfer, reduce the pressure in the system and increase the service life of the system elements.

Do not use high pressure washers to clean the condenser. This can damage the B thin-walled fins. Even with regular cleaning, the condenser needs to be replaced more often than we would like. The fact is that he is the first to take over the flow of deicing reagents, dirt and stones from the road. And its tube walls are thin ... In most cases, the condenser is damaged by corrosion in the third or fourth year of operation.

If, as a result of corrosion, the tightness of the condenser is broken, then it is more expensive to repair it. Even if the master argon welding it will be possible to patch the hole, then soon a leak may appear in another place. By the way, the pressure in the system on hot days can reach 25-28 bar.

In addition, one should take into account the complex structure of the condenser tube: along it is divided by partitions into channels, so there is a high probability that after welding some of the channels will be blocked. Accordingly, the dissipated power will drop and the operation of the air conditioner will deteriorate, especially in traffic jams and in hot weather.

After each experiment with patching the condenser, it will be necessary to pay for removal and installation, welding of the condenser and charging the system with refrigerant. So it's best to install a new condenser right away. Instead of an expensive original one, it is quite possible to buy a cheaper condenser from authorized spare parts manufacturers.

The evaporator is located in the cabin heating and air conditioning unit. The evaporator is made of aluminum tubes with external fins to improve heat transfer. Passing through the tubes of the evaporator, the boiling refrigerant actively absorbs heat

From the air blowing over the outer finned surface of the tubes. The air is cooled and blown into the vehicle interior by a fan.

When the air passing through the evaporator is cooled, the water vapor contained in it condenses.

Condensation through a drain pipe connected to the casing of the heating system unit ...
... and led out through a plastic adapter at the bottom right side engine shield, drains under the bottom of the car. If the ambient air humidity is high, a puddle of water may form under the car, which is an indirect sign of the condition of the air conditioning system.

During the operation of the car, particles of road dust and dirt settle on the outer surface of the evaporator, which is damp from condensation.
This layer becomes an excellent environment for life and rapid reproduction of putrefactive bacteria and fungal cultures. Over time, the car appears bad smell... It is felt especially strongly when the air conditioner is turned off and in wet weather. In order to minimize the risk of this problem, when buying a new car, it is necessary to carry out preventive treatment of the evaporator with special chemicals, and replace it regularly cabin filter and clean the drain tube. If, despite the measures taken, the smell still appears, contact specialized service for the repair of car air conditioners for disinfection or flushing of the evaporator. If it is very dirty, the evaporator will have to be replaced.

On the side surface of the evaporator there is a flange for mounting a thermostatic valve.

The block-type thermostatic valve is located in the evaporator housing. The valve is attached to the piping and evaporator with flange connections. Having passed through the throttling hole in the valve body, the liquid refrigerant sharply decreases its pressure and begins to boil. A regulating element is installed in the valve body, which changes the flow area of ​​the throttling hole depending on the pressure and temperature of the refrigerant. The adjusting element is adjusted at the factory and cannot be adjusted during operation.

The receiver-drier is installed on the left side of the condenser and is a collapsible unit. Inside the housing there is a filter element (cartridge) filled with desiccant granules (silica gel). The liquefied refrigerant passing through the receiver is cleaned of possible impurities, dirt and moisture. In the upper part of the receiver housing there is a hole for replacing the filter element.

In case of repair or replacement of air conditioning system elements, if it was in an open state (some units were removed, pipelines were destroyed, etc.), the receiver-dryer cartridge must be replaced. Otherwise, after charging the system, the refrigerant will not dry out and acids may form inside the system, which will destroy the parts of the air conditioner from the inside.

Flexible insert hose design: 1 - outer protective sheath; 2 - fabric cord of the power frame; 3 - plastic sealing layer; 4 - inner oil-resistant layer

The pipelines connect all the elements of the air conditioning system into a single sealed circuit. The pipelines and their flanges are made of aluminum alloys.
Protect metal piping from dents and kinks. Any narrowing of the flow area of ​​the pipeline leads to a decrease in the performance of the system.

To connect the reciprocating elements of the system, the pipelines in some sections are equipped with flexible inserts made of synthetic materials.

O-rings made of neoprene are installed at the joints of the individual elements of the system. During the repair of the system, when the pipe sections are disconnected, the O-rings must be replaced without fail. Tighten the threaded connections of the pipelines to the recommended torque. Weak or excessively tight tightening will deform the sealing surfaces and leak refrigerant.

Service valves for connecting diagnostic and refueling equipment are located on the pipelines.

This is how the service valves of the high A and low B pressure lines are located on the pipelines.
The valves are closed with threaded caps to keep dirt out.
The valves are equipped with spools, similar in design to the spools of wheel tires, but differing from them in size.

A special wrench is used to turn the spools in and out.

It is forbidden to check the presence of refrigerant in the system by pressing the spools of the service valves, since after such a check the valve spool may not close completely and refrigerant will leak from the system!

The pressure sensor is installed in the engine compartment on the high pressure line.

By sensor signals the electronic unit engine control turns off the air conditioner compressor when the system is depressurized or an emergency increase in pressure in it in order to protect the compressor from overloads.
The panel of the control unit for the ventilation, air conditioning and heating system of the vehicle is installed on the console of the instrument panel.

Interior temperature sensor

Located in the front panel of the control unit if the vehicle is equipped with a climate control system. To exclude incorrect readings of temperature values ​​due to the influence of heated panel elements, the sensor is equipped with a forced airflow system. The system provides a uniform flow of air from the front of the vehicle through the sensor housing. For normal air movement, keep the inlet of the sensor housing away from any solid particles or liquid. This is especially true in cases of dry cleaning of the interior. When cleaning the interior with a vacuum cleaner, it is strictly forbidden to bring the suction tip of the vacuum cleaner pipe to the inlet of the sensor. If the flow of air through the sensor housing is obstructed, the automatic climate control system will not function properly.

Sensor outside temperature Although located at the front of the vehicle behind the radiator grille, protected from sunlight and ventilated, it is exposed to factors such as warm air from the engine and radiation from heated asphalt. Therefore, its readings can sometimes be somewhat overestimated, especially after a long idle time in traffic jams. The outside temperature reading can be considered correct when driving at a speed of at least 40 km / h for at least 10 minutes.
To improve the efficiency of the climate control system and more comfortable air flow distribution, a sun sensor is installed in the passenger compartment. Depending on the degree of heating of the passenger compartment by the rays of the sun, the sensor signals the air flows to the head or legs of the driver and front passenger. The sensor is located on the dashboard near the windscreen glass.

Refrigerant. The system is charged with refrigerant HFC134a (R134a). Refrigerant added special oil for compressor lubrication. It is strictly forbidden to use other types of refrigerants and oils in the system.

During the operation of a car air conditioner, situations periodically arise when the air conditioning system needs to be serviced or repaired. For this, modern diagnostic and repair equipment is used. The most common situation is the depressurization of the system and the release of the refrigerant from it.

Highly sensitive halogen leaks with audible indication are used to locate leaks.

In some difficult cases, the so-called method is used. ultraviolet diagnostics of the tightness of the car air conditioner system.

The method consists in introducing a special dye into the system in micro doses.

In places of microleaks, the dye, together with the refrigerant, gradually comes out onto the outer surface of the system elements.
During the inspection of the system, the dye begins to glow (fluoresce) under the influence of ultraviolet rays from a special lamp ...
... and refrigerant leaks become visible.

It should be noted that the colorant has no negative effect on the system. It can remain in the refrigerant and circulate through the system for as long as you like and only serve its purpose when a leak occurs.

After repairing the air conditioner, it is necessary to evacuate and charge the system with the appropriate refrigerant (R134a). The volume of filling the car air conditioner is individual for each car model.

To carry out a high-quality refueling of an automobile air conditioner, you need:

Precision gauge blocks with special connection tips:

Two stage Vacuum pump for complete removal of air and water vapor from the system;
- high-precision (graduation not more than 5 g) scales for dosing the refrigerant to be charged.
Due to the specific features of the repair of the air conditioning system, this section only describes the work on the removal and installation of individual elements and the system control unit. Work related to charging the system with refrigerant should be carried out in specialized service centers.

The air conditioning system is charged with high pressure refrigerant. The contact of liquid refrigerant on the skin of a person causes severe frostbite, therefore, all work related to the maintenance, repair or dismantling of air conditioning system elements, if possible, should be carried out in specialized service centers equipped with professional technological equipment. Take precautions when working on your own.

FEATURES OF THE VENTILATION SYSTEM DEVICE

The vehicle is equipped with a ventilation system of the supply and exhaust type. Outside air can enter the passenger compartment through the door windows when the windows are lowered ...

And through the grille of the air intake box, located in front of the windshield, into the air intake. Air from the air intake is supplied through the air ducts to the vehicle interior through the windshield blowing nozzles, side and center nozzles, through the lower nozzles of the heater body.

The air entering the car from the street is cleaned of dirt and pollen particles in the cabin air filter, located in the housing of the climate control unit.
Filter element air filter must be replaced in accordance with the terms of the maintenance work Exhaust ventilation is carried out through the grilles, which are made in the rear luggage compartment lining.

When placing cargo in the trunk, if possible, try not to obstruct the ventilation grilles, leave a small gap between the luggage and the trim panel. Efficient exhaust ventilation improves temperature regime in the passenger compartment and reduces the formation of condensation on the glass windows.

From the street side, the exhaust ventilation openings are closed by deflectors with petal valves, which are installed in the rear part of the body, in the cavity of the rear bumper (view with the rear bumper removed).

SAFETY RULES FOR REPAIR AND MAINTENANCE OF AIR CONDITIONING SYSTEM

1. Refrigerant is a chemical composition that must be handled with care to avoid harm to health.

2. Work in a well-ventilated area and avoid breathing refrigerant vapors.

3. When performing work related to depressurization of the air conditioning system, always wear protective goggles and wrap fittings, valves and connections with a clean cloth.

4. It is forbidden to carry out welding work on the car near the units and pipelines of the air conditioning system.

5. It is forbidden to bend flexible pipe fittings (hoses) with a radius less than four diameters of the flexible fitting.

6. The hoses should be inspected regularly for cracks and abrasions.

7. Before disconnecting the piping of the air conditioning system, it is necessary to remove all refrigerant from it.

8. Unscrew the threaded connections of the system elements slowly. Keep your face and hands away from the separation to avoid injury if there is residual liquid refrigerant in the system.

9. If the pressure in the system is detected during the disconnection of the pipelines, it is necessary to remove the refrigerant from it.

10. After disconnecting any part, immediately close the holes with caps or tape. This will prevent moisture and dirt from entering the system, which can cause damage to the pumping part of the compressor.

Air conditioning system polo sedan compressor type. The heater units and the heat exchanger of the air conditioner evaporator are arranged in one block. The controls for the air conditioning system are located on the panel, which is common with the controls for the heater.

A schematic diagram of the movement of refrigerant in an air conditioning system is shown in the schematic diagram below.

Schematic diagram of refrigerant movement in the air conditioning system: 1 - combined pressure sensor; 2 - section of the high pressure pipeline; 3 - receiver-dryer; 4 - service valve of the high pressure line; 5 - condenser (air conditioner radiator); 6 - fan of the condenser and radiator of the cooling system; 7 - air conditioner compressor; 8 - section of the low pressure pipeline; 9 - service valve of the low pressure line; 10 - heater fan; And - the evaporator; 12 - thermostatic valve

The compressor is mounted on the engine block and driven by a V-belt, the compressor circulates the refrigerant in the system. The compressor shaft is mounted in an aluminum front cover of the housing on bearings and is sealed on the side of the drive pulley with an oil seal.

The compressor drive pulley is mounted on two<рядном шариковом подшипнике и при работающем двигателе постоянно вращается крутящий момент передается от шкива к валу компрессора через ведомый диск.

NOTES

If the system is working properly, when the air conditioner is turned on, a click is heard - this is the clutch pressure plate, under the action of an electromagnet, engages with the drive pulley, and the compressor rotor begins to rotate.

But during the operation of the air conditioner, the following compressor malfunctions may occur.

1. If, when the air conditioner is off, the clutch emits extraneous sounds during rotation, heats up or there is a burning smell, then, probably, its bearing has begun to deteriorate. In this case, the bearing must be replaced. In some advanced cases, it may be necessary to replace the compressor clutch assembly or its component parts.

2. If, after turning on the air conditioner, a click is not heard, then the following malfunctions are possible:

• a refrigerant leak has occurred and the control system blocks the activation of the compressor;
• the pressure sensor in the system is out of order;
• malfunctions in the electrical circuits of the control system;
• the coil winding of the clutch electromagnet burned out;
• the engine control unit for any reason (high temperature of the engine coolant, high engine speed) blocked the inclusion of the compressor.

3. If the clutch rotates easily and freely, but when the air conditioner is turned on, extraneous noises are clearly audible or even the engine stalls, then most likely the compressor is jammed. The internal pumping part of the compressor cannot be repaired. In this case, the compressor will have to be replaced.

4. And the last, most unpleasant option. The click is heard, the clutch easily rotates the compressor shaft, and there is no cooling of the air in the cabin. In this case, the compressor runs idle, pumping nothing. Only an experienced specialist with special control and diagnostic equipment can determine this malfunction.

The most accurate determination of the cause of the malfunction can be after a complete diagnosis in a specialized service center for the repair of car air conditioners.

An emergency pressure relief valve is installed in the lower part of the rear compressor cover. In the event of an increase in pressure in the system due to a failure of the pressure sensor or other abnormal situations, when the set maximum pressure is exceeded, the valve membrane collapses and part of the refrigerant is thrown out into the street.As a rule, after that the emergency valve does not have sufficient tightness. Therefore, after eliminating the causes that caused the increase in pressure and discharge of the refrigerant, the valve must be replaced.

A WARNING

When the valve is triggered, the refrigerant is suddenly ejected in strong jets in all directions. To prevent injury to people, it was closed with a cap.

Condenso p (air conditioner radiator) multi-flow type is located in front of the radiator of the engine cooling system. It is attached with brackets to the radiator of the cooling system. Condenser honeycombs are made of flat thin-walled aluminum tubes with internal longitudinal baffles for rigidity and external fins to improve heat transfer. Aluminum tanks, with flanges for connecting pipelines and receiver. The tanks are divided into sections along the height, therefore, passing through the condenser, the refrigerant flow changes direction several times. The condenser condenses the vapors of the refrigerant compressed by the compressor and removes the resulting heat into the ambient air.

When the air conditioner is turned on, the engine control unit turns on the power circuit for the electric fan of the engine cooling radiator, which improves heat transfer in the condenser and reduces the pressure in the air conditioning system.

Evaporator located in the unit and the air conditioning of the cabin. The evaporator is made of aluminum tubes with external fins to improve heat transfer. Passing through the tubes of the evaporator, the boiling refrigerant actively absorbs heat from the air blowing over the outer ribbed surface of the tubes. The air is cooled and blown into the vehicle interior by a fan.

On the side surface of the evaporator there is a flange for mounting a thermostatic valve.

Thermostatic valve block type is located in the evaporator housing. The valve is attached to the piping and the evaporator with flange connections After passing through the throttling hole in the valve body, the liquid refrigerant dramatically decreases its pressure and begins to boil. A regulating element is installed in the valve body, which changes the flow area of ​​the throttling hole depending on the pressure and temperature of the refrigerant. The adjusting element is adjusted at the factory and cannot be adjusted during operation.

Receiver drier mounted on the condenser on the left side and is a collapsible unit. Inside the housing there is a filter element (cartridge) filled with desiccant granules (silica gel). The liquefied refrigerant passing through the receiver is cleaned of possible impurities, dirt and moisture. In the upper part of the receiver housing there is a hole for replacing the filter element.

Pipelines connect all the elements of the air conditioning system into a single sealed circuit. The pipelines and their flanges are made of aluminum alloys.

Protect metal piping from dents and kinks. Any narrowing of the flow area of ​​the pipeline leads to a decrease in the performance of the system.

To connect the mutually moving elements of the system, the pipelines in some sections are equipped with flexible inserts (Figure 12.3) made of synthetic materials.

At the joints of the individual elements of the system, o-rings round section made of neoprene. During the repair of the system, when the pipe sections are disconnected, the O-rings must be replaced without fail. Tighten the threaded connections of the pipelines to the recommended torque. Weak or excessively tight tightening will deform the sealing surfaces and leak refrigerant.

Service valves for connecting diagnostic and refueling equipment are located on pipelines.

The valves are closed with threaded caps to keep dirt out.

The valves are equipped with spools, similar in design to the spools of wheel tires, but differing from them in size.

A special wrench is used to turn the spools in and out.

Pressure sensor installed in the engine compartment on the high pressure line.

According to the sensor signals, the electronic engine control unit turns off the air conditioner compressor when the system is depressurized or when the pressure in it rises in order to protect the compressor from overloads.

Control unit panel the ventilation, air conditioning and heating system of the car is installed on the console of the instrument panel.

Air temperature sensor in the passenger compartment is located in the front panel of the control unit if the vehicle is equipped with a climate control system. To exclude incorrect readings of temperature values ​​due to the influence of heated panel elements, the sensor is equipped with a forced airflow system. The system provides a uniform flow of air from the front of the vehicle through the sensor housing. For normal air movement, keep the inlet of the sensor housing away from any solid particles or liquid. This is especially true in cases of dry cleaning of the interior. When cleaning the interior with a vacuum cleaner, it is strictly forbidden to bring the suction tip of the vacuum cleaner pipe to the inlet of the sensor. If the flow of air through the sensor housing is obstructed, the automatic climate control system will not function properly.

Outside temperature sensor Although located at the front of the vehicle behind the radiator grille, protected from sunlight and ventilated, it is exposed to factors such as warm air from the engine and radiation from heated asphalt. Therefore, its readings can sometimes be somewhat overestimated, especially after a long idle time in traffic jams. The outside temperature reading can be considered correct when driving at a speed of at least 40 km / h for at least 10 minutes.

To improve the efficiency of the climate control system and more comfortable air flow distribution, a sun sensor is installed in the passenger compartment. Depending on the degree of heating of the passenger compartment by the rays of the sun, the sensor signals the air flow to the head or legs of the driver and front passenger. The sensor is located on the dashboard near the windscreen glass.

Refrigerant. The system is charged with refrigerant HFC134a (R134a). A special oil has been added to the refrigerant for lubricating the compressor. It is strictly forbidden to use refrigerants and other types of oils in the system.