F 350 2WD Pickup V8-460 7.5L VIN G EFI (1997)
Compressor Clutch: Description and Operation
A magnetic A/C clutch is used to drive the compressor shaft. When voltage is applied to the A/C clutch field coil, the clutch plate and hub assembly
(which is solidly coupled to the compressor shaft) is drawn rearward by magnetic force toward the A/C clutch pulley, which rotates freely on the
compressor front head casting. The magnetic force locks the clutch plate and hub assembly and the pulley together as one unit. The compressor shaft
then turns with the A/C clutch pulley. When voltage is removed from the A/C clutch field coil, springs in the clutch plate and hub assembly move the
clutch plate away from the A/C clutch pulley. The clutch plate hub assembly and compressor shaft cease to rotate.
The A/C clutch is energized when the A/C cycling switch, located on the suction accumulator/drier, closes. The closing of the A/C cycling switch
completes the circuit to the A/C clutch and draws it into engagement with the compressor driveshaft.
When the A/C cycling switch is closed and the control knob/lever is set at MAX A/C, NORM A/C, or either of the settings calling for full or partial
defroster operation, the A/C compressor will be operating. (A/C compressor operation during defrost is provided to minimize humidity in the passenger
compartment.)