Compressor Clutch Relay: Description and Operation

A/C Request And Compressor Clutch Circuit Diagram:

The PCM controls the A/C compressor clutch relay. 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.