A car air-conditioner works on the same principle as your room air-conditioner or a refrigerator. The fundamental principle involved is heat-exchange. A refrigerant gas that forces the transformation of liquid to gas and back to liquid, and in the process it absorbs or releases heat. The compressor of an AC, compresses the low-pressure gas into high-pressure, heating it up in the process. The condenser and the fan force this gas to cool down, turning it into a high-pressure liquid form, losing s

How a Car's HVAC System Works