Compressor HVAC: Description and Operation
A/C COMPRESSORDESCRIPTION
A/C Compressor - Typical:
Vehicles equipped with the 3.8L gasoline engine use the Denso 10S17 A/C compressor. Vehicles equipped with the 3.5L gasoline engine use the Denso 10S20 A/C compressor. Both A/C compressors include an integral high pressure relief valve and have the suction and discharge ports located on the cylinder head at the rear of the compressor. A label identifying the use of R-134a refrigerant is located on both A/C compressors.
OPERATION
The A/C compressor is driven by the engine through an electric clutch, drive pulley and belt arrangement. The A/C compressor is lubricated by refrigerant oil that is circulated throughout the refrigerant system with the refrigerant.
The A/C compressor draws in low-pressure refrigerant vapor from the A/C evaporator through its suction port. It then compresses the refrigerant into a high-pressure, high-temperature refrigerant vapor, which is then pumped to the A/C condenser through the compressor discharge port.
The A/C compressor cannot be repaired and, if faulty or damaged, it must be replaced. The compressor clutch, pulley and bearing assembly, and clutch field coil are available for service. If an internal failure of the A/C compressor has occurred, the receiver/ drier must also be replaced.