A/C Compressor Clutch: Operation

WARNING: This page is about a different car, the 2003 Dodge Dakota. However, it is still accessible from the selected car via links, so may be relevant.

The compressor clutch assembly provides the means to engage and disengage the compressor from the engine serpentine accessory drive belt. When the clutch coil is energized, it magnetically draws the clutch into contact with the rotor and drives the compressor shaft. When the coil is not energized, the rotor freewheels on the clutch rotor bearing, which is part of the rotor. The compressor clutch and coil are the only serviced parts on the compressor.

The compressor clutch engagement is controlled by several components: the a/c heater mode control switch, the a/c loss of charge switch, the a/c pressure transducer, the compressor clutch relay, the evaporator temperature sensor and the Powertrain Control Module (PCM). The PCM may delay compressor clutch engagement for up to thirty seconds (Refer to DESCRIPTION ).