RAM 2500 Van V8-5.2L Prop VIN 2 (2000)
Compressor Clutch: Description and Operation
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 on the compressor shaft and secured with a nut.
These components provide 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 plate 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 is controlled by several components: the heater-A/C mode control switch, the low pressure cut-off switch, the high pressure
cut-off switch, the fin sensing cycling clutch switch, the thermal limiter switch, the compressor clutch relay, and the Powertrain Control Module (PCM).
The PCM may delay compressor clutch engagement for up to 30 seconds. Refer to Fuel System for more information on the PCM controls.
