Discount Van Truck

RV Air Conditioning Parts & Spare Parts

All Important Information on the Methods of Use, Installation, Diagnosis and Service Life

Air conditioning in a vehicle is a sealed system in which refrigerant circulates. It is a substance that generates heat when compressed in a liquid state and absorbs it when it expands in a gaseous state. The refrigerant is pressurized by a compressor. This is activated by the engine crankshaft, an electromagnetic clutch or its own electric motor.

After activating the air conditioning, the compressor compresses the refrigerant, heating it to a temperature of 80-90 ºC. Then, either it is directed to the condenser, where the air circulates against the current, or a fan blows on it. These temperature fluctuations cause the condensation process and, changing to a liquid state, the refrigerant passes through a receiver-drier, where dust and moisture are removed.

Symptoms of Malfunction

Noises and hums from the compressor when the air conditioning is on or off indicates that the pulley bearing is worn. However, if the noise only appears when the engine is running, the compressor itself is probably faulty. It must then be replaced. A decrease in cooling efficiency and the appearance of white foam in the inspection window (if present) indicates that the system is leaking. If a condenser is damaged, the system may shut down on its own. The same problem happens when the thermostatic control valve is clogged. The evaporator tubes can also become covered with ice and interruptions in the cold air supply can occur.

Causes of Malfunctions

The deterioration of the compressor and other components are most often caused by a lack of lubricant, which can be explained by a low level of refrigerant or by the fact that the system has not been used for a long time. The air conditioning must therefore be turned on at least once a week. Corrosion that damages the radiator and heater can be caused by a failure of the filter drier, if, for example, it was not replaced during the depressurization of the system.

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