The air conditioning system conditions the air inside the car, this means means while cooling the air it also helps to ensure there isn't too much moisture in the car which stops the air getting humid. The air conditioning unit also cleans the air in the car by filtering the dust and other small particles inside the car.

So the air conditioning system cools the air, reduces moisture content and controls humidity. Air conditioning has four essential parts mainly an evaporator, compressor, condenser and an expansion device which work around the principles of evaporation, condensation, compression and expansion.

An air compressor is a device that compresses low pressure air to high pressure air. The air compressor is the "heart" of the car's air conditioning system.

The air compressor has various uses such as compressing refrigerant for cooling the interior of the car. The refrigerant is sucked in as a gas at low pressure and low temperature from the evaporator, it is then compressed and sent to the condenser as a gas at high temperature and high pressure.

A damaged or failed compressor can be identified by the following signs: Insufficient or no cooling performance, Error code in the air-conditioning central control unit, Development of noise and leakage. Once you have established this part needs replacing, buying a new aircon compressor will ensure your car returns to its optimim performance level to keep you cool when driving.