Lumina APV V6-3800 3.8L (1994)
Compressor Clutch Relay: Description and Operation
A/C Request And Compressor Clutch Circuit Diagram
The PCM controls the A/C compressor clutch relay. The relay gets battery power when the ignition is turned "ON" and energizes when the PCM
completes the circuit to ground. When the A/C is turned on, the PCM delays the clutch engagement of the A/C compressor to allow the IAC valve to
raise the engine idle speed to compensate for the added load. The PCM also causes the relay to disengage the A/C clutch at wide open throttle, when the
engine is overheating, and when the A/C system pressures are not within a specified range.
