Warm up the engine to working temperature.

Establish an air temperature regulator on the lowest temperature, and the handle of management of the heater fan for the highest speed. Open car doors.

After central air provided a demanded temperature mode, check temperature of two pipelines on a partition of the motor compartment, connected to the evaporator.

Thinner pipeline connecting the evaporator to the condenser, should be kolodny, and thicker pipeline connecting the evaporator to the compressor, should be even colder – 2–5 °C. If the pipeline connecting the evaporator to the compressor, much more warmly, than the pipeline connecting the evaporator to the condenser, system needs refueling. Insert the thermometer into the central ventilating lattices of the dashboard at work of central air of air in a mode of the maximum cooling — the temperature shown by the thermometer, should be lower on 15–20 °C than air temperature in car salon. If the difference of temperatures is much less, possibly, the system needs refueling.

If from ventilating lattices warm air moves, check operation of the coupling of the compressor of the conditioner. The assistant should include air central air, at that time when you look at the forward party of the compressor. The coupling at inclusion should publish heard click, and the nave of the coupling should start to rotate.

If the coupling does not work, check the fuses located in the dashboard.

If safety locks are serviceable, according to electric circuits check serviceability of chains of the coupling of the compressor and the pressure sensor.

If chains of the coupling of the compressor and the sensor of pressure are serviceable, possibly, the coupling failed.

If the coupling of the compressor, the relay and their electric chains are serviceable, probably, the system needs refueling by a coolant. All further checks and repair of central air of air are necessary for carrying out at service station