RAM 2500 Truck 4WD V10-8.0L VIN W (1997)
Compressor Clutch: Description and Operation
Fig 5 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 and pulley are retained on the compressor 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 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 cycling clutch switch, the high
pressure cutoff switch, the compressor clutch relay, and the Powertrain Control Module (PCM). The PCM may delay compressor clutch engagement for
up to thirty seconds.
