Compressor Clutch Relay: Description and Operation

Relay Center:

The ECM/PCM controls the A/C compressor clutch relay. When the A/C is turned "ON," the ECM/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 ECM/PCM also causes the relay to disengage the A/C clutch at wide open throttle, high pressure power steering pump loads and when the engine is overheating.