F 150 4WD Pickup V8-5.4L SOHC VIN 3 (1999)
Compressor Clutch: Description and Operation
NOTE:
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Internal A/C compressor components are not serviced separately. The FS-10 A/C compressor is serviced only as an assembly. The A/C clutch,
A/C clutch pulley, A/C clutch field coil and the shaft seal are serviceable.
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Whenever the A/C compressor is replaced, also replace the A/C evaporator core orifice.
Compressor Clutch Components
The magnetic A/C clutch has the following characteristics:
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It drives the compressor shaft.
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When battery positive voltage (B+) is applied to the A/C clutch field coil, the clutch plate and hub assembly is drawn toward the A/C clutch pulley
.
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The magnetic force locks the clutch plate and hub assembly and the A/C clutch pulley together as one unit, causing the compressor shaft to rotate.
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When B+ 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.
