A/C Signal: Description and Operation

Conditions

A/C or defrost switch is turned ON.

A/C low pressure, high pressure and electronic cycling switches are closed.

Operation

^ The Control Module receives an A/C selected signal.

^ PCM then engages A/C compressor clutch (by grounding clutch relay).

^ PCM maintains correct engine idle speed, through the Idle Air Control (IAC) Motor.

^ PCM monitors status of switches and cycles compressor clutch accordingly.