The compressor is the pump part of the system that moves the cooling solution, Freon, through the car air conditioning system. While moving through the system, the Freon, which is a gas and a liquid, is forced through different sized metal and rubber hoses and tubes, through what is called an expansion valve. This constant pressure and condensing and expanding of the Freon makes it get very cold within the metal and rubber hoses. As the Freon moves into the dash area of the automobile, it is relocated into a metal tube system that is called the evaporator core Company webpage .
This system is comparable in function to a radiator, nevertheless, the very cold Freon within the interior of the metal tubes in the evaporator core cools the air that the air conditioner fan blows from the back of the dash to the front. This cooled air is then blown into the passenger area of the automobile through the vents located in the dash.
The control on the dash that the driver or passenger can adjust doesnt control the temperature level of the evaporator core, rather, it manages how much air is blown across the core. The greater the amount of air, the more cold air that is pushed into the automobiles cab or passenger area. More advanced car air conditioning systems have a thermostat that automatically readjusts the fan and controls the temperature level of the passenger compartment. As the temperature level rises, the thermostat sends a signal to the fan to accelerate and produce even more cold air, reducing the temperature level.
Car air conditioning systems additionally eliminate heat from the automobile with the Freon that is returning from the evaporator core to the condenser. This is done at the front of the engine, usually near the radiator. The warmed Freon is moved to the condenser, which is like the evaporator core, but, instead of allowing the cold Freon to cool the air, it allows the hot Freon to release the heat to metal fins, then a fan blows this heat away from the engine. In this way, the car air conditioning system works as both a cooling and a heat removal system as the Freon circulates through the hoses and metal condenser.