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The Air Conditioning Compressor is responsible for compressing and circulating refrigerant, a gas that carries heat outside of the car, throughout the air conditioning system. It functions as follows: First, the compressor compresses the refrigerant, which means it pressurizes it; then the refrigerant is sent to the coils of the compressor, which use air that is being blown in from outside the car to cool the refrigerant. The refrigerant became very hot when it was compressed. The now cooled refrigerant changes from a gas to a liquid and is forced into the evaporator, which removes the pressure that was initially added to the refrigerant, thus causing some of the substance to become a gas. The remaining liquid portion of the mixture collects the heat from the gas portion, and allows the evaporator to remain cold. Outside air is then blown through the evaporator and into the interior, causing the vehicle's passengers to feel cold air. Thereafter the cycle continues indefinitely.