Compressor HVAC: Description and Operation

Denso 7SBU16C A/C Compressor:

The standard front A/C system uses a Denso 7SBU16C seven cylinder, variable displacement swash plate-type A/C compressor. This A/C compressor has a volume control which is regulated by an internal control valve and has both the suction and discharge ports located at the rear of the compressor.

Denso 10S17C A/C Compressor:

The optional independent Konvekta rear A/C system uses the Denso 10S17C ten cylinder, double-acting swash plate-type A/C compressor. This A/C compressor has a fixed displacement of 170 cubic centimeters (10.374 cubic inches), and has both 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.

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.