Compressor HVAC: Description and Operation
COMPRESSOR-A/CDESCRIPTION
NOTE: Denso 10S17 A/C compressor shown. Visteon HS-18 compressor similar.
The A/C system on vehicles equipped with the 2.8L diesel engine use a Denso 10S17 ten cylinder, double- acting swash plate-type A/C compressor (1). This A/C compressor has a fixed displacement of 170 cubic centimeters (10.374 cubic inches).
The A/C system on models equipped with the 3.7L engine use a Visteon HS-18 A/C compressor. This A/ compressor is a 10 cylinder reciprocating swash plate type compressor with a fixed displacement of 180 cubic centimeters (10.9 cubic inches).
Both A/C compressors have the suction and discharge ports (2) located on the compressor cylinder head (3) at the rear of the compressor and have a label identifying the use of R-134a refrigerant.
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 A/C accumulator must also be replaced.