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   Your car's air conditioning system is divided into two sides, known as the high side and the low side.
   The compressor, beginning at the high side, functions like a pump, moving the refrigerant through the system.
   The expansion valve, which begins at the low side, restricts the refrigerant flow, creating the pressure differential the system needs to ensure the increase and decrease in temperature and boiling point.


Climate Control




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Your A/C system consists of four major parts which provide cooling for the passenger compartment. The industry generally has two different system designs. These designs are identified as expansion valve or orifice tube type.


  • The compressor, mounted on the engine, is the pump which circulates the refrigerant through the system, transferring the heat from the passenger compartment to the outside. The compressor is the most important and expensive component of the A/C system.

  • The condenser transfers heat removed from the passenger compartment to the outside air. It is located in front of the radiator, just behind the front grille of the vehicle.

  • The evaporator, located near the dash or firewall, transfers the passenger compartment heat to the refrigerant so it can be sent to the condenser.

  • The dryer absorbs any excess moisture from the refrigerant.


Flexible hoses transfer the refrigerant both to and from the engine-mounted compressor and other system parts which are mounted on the vehicle body. The flexible hoses can be a major refrigerant leak source. The system also has many connections which require rubber seals which need to be checked for leaks.

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