17. Air conditioning system

Arrangement of elements of the air conditioning system on the car

1 – compressor;
2 – coupling of the compressor;
3 – condenser;
4 – receiver;
5 – condenser fan;
6 – heater block;
7 – switch of double pressure;
8 – pipe No. 1;
9 – pipe No. 2;
10 – pipe of low pressure;
11 – pipe of high pressure;
12 – the soaking-up pipe

The compressor put in action by the car engine compresses gaseous coolant to high pressure, at the same time coolant temperature considerably increases. Then the compressed and heated coolant moves in the condenser installed on a cooling system radiator. The condenser cools gaseous coolant which turns into liquid. Liquid coolant comes to the receiver / dryer where from it water is endowed, then gives liquid to the evaporator located in the heater block in interior of the car. In the evaporator liquid coolant evaporates, turning into gaseous state and, reduces temperature of the air coming to salon. Further gaseous coolant arrives to the compressor, and the cycle is repeated again.

The relay of the conditioner operates electric chains of the fan of the condenser and compressor of the conditioner. Control of the relay is exercised of the control unit of the engine. If cooling liquid exceeds some temperature, the control unit of the engine switches off the relay therefore air conditioning system is switched off. At launch of the engine or acceleration of the car the control unit of the engine switches off the relay therefore air conditioning system within 5 seconds is switched off.

The fan blows air via the evaporator core therefore the stream of the cooled air given to interior of the car increases. Frequency of rotation of the fan is defined by position of the switch of the fan and the block of resistors.

The compressor of the conditioner is primary element of the air conditioning system. If the compressor of the conditioner fails, there is no compression and movement of coolant on a contour of the air conditioning system. The compressor of the conditioner is located on the left side of the engine and is put in action by a belt from a pulley of a bent shaft.

Coupling of the compressor of the conditioner turns on the compressor. Coupling has electromagnetic management.

The condenser is installed before a radiator. The fan of the condenser increases an air stream via the condenser.

The block of the fan / evaporator contains the engine of the fan, the relay of the conditioner, the core of the evaporator and the broad valve.

The core of the evaporator performs functions of cooling and an osushka of air. When cooling air, moisture from air is besieged on the evaporator, and the cooled dry air comes to interior of the car.

The broad valve allows liquid coolant to extend under high pressure, entering the evaporator. The valve passes a certain amount of liquid coolant to exclude flooding of the evaporator.

The drained air can be reheated, passing through a heater radiator. The radiator of a heater heats up the hot cooling liquid passing through it.

Liquid coolant from the condenser where from it water is removed comes to the receiver / dryer and then coolant arrives to the evaporator.

Air conditioning system is filled with R-134a coolant.


Do not add R-12 coolant to air conditioning system intended for R-134a coolant. These coolants should not mix up as it will lead to failure of the air conditioning system.

Do not allow contact of coolant with skin.

During the work near air conditioning system put on goggles.

At hit of coolant on skin or in eyes do not pound the struck place, immediately wash out cold water not less than 15 minutes and see a doctor. Self-treatment is not allowed.

Gaseous coolant is heavier than air and rather quickly has to gather below, for example under the car.

When carrying out welding works near the air conditioning system always delete from it coolant. Electric welding near pipelines with coolant can cause decomposition of coolant under the influence of ultra-violet radiation.

Do not subject air conditioning system detail to influence of high temperature or an open flame. The overheat can lead to increase in pressure in system and to ignition.