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Home >> GMC >> 1992 >> Syclone V6-262 4.3L Turbo >> Repair and Diagnosis >> Heating and Air Conditioning >> Compressor HVAC >> Description and Operation >> Compressor Controls
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Compressor Controls

COMPRESSOR CONTROLS

The compressor for the air conditioning system is driven by the engine by means of a belt drive and the A/C Compressor Clutch. The clutch allows the compressor to be disengaged when air conditioning is not required. Power to the A/C Compressor Clutch is supplied by the HTR-A/C Fuse.

The A/C Compressor Clutch Diode is connected across the terminals of the A/C Compressor Clutch. Whenever the clutch is de-energized, the magnetic field around R collapses, generating an induced voltage in the clutch coil. The Diode provides a path for the voltage resulting from the induced voltage so other circuit components are not damaged.


With the A/C Selector Switch in any mode except HEAT or VENT, voltage flows from the A/C Selector Switch through the LT GRN (66) wire to the Evaporator Pressure Switch. Battery voltage is passed through the Evaporator Pressure Switch to the A/C Compressor Clutch through the DK GRN (59) wire. The A/C Compressor Clutch is grounded through the BLK (150) wire and ground G104.

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