RAM 2500 Truck 4WD L6-5.9L DSL Turbo VIN 7 (2001)
Compressor Clutch: Description and Operation
Fig.4 Compressor Clutch - Typical
The compressor clutch assembly consists of a stationary electromagnetic coil, a hub bearing and pulley assembly, and a clutch plate. The electromagnetic
coil unit and the hub bearing and pulley assembly are each retained on the nose of the compressor front housing with snap rings. The clutch plate is
mounted to the compressor shaft and secured with a nut.
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 pulley and drives the compressor shaft. When the coil is not energized, the
pulley freewheels on the clutch hub bearing, which is part of the pulley. 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 low pressure switch, the a/c high
pressure switch, the compressor clutch relay, and the Powertrain Control Module (PCM). The PCM may delay compressor clutch engagement for up to
thirty seconds. Refer to Electronic Control Modules for more information on the PCM controls.
