Fifth Avenue V6-231 3.8L VIN L FI (1992)
Compressor Clutch Relay: Description and Operation
Relay Identification
Purpose
Powertrain Control Module (PCM) monitors engine load and A/C system pressure, and cycles the A/C compressor clutch accordingly.
Operation
A/C or defrost switch is turned ON.
A/C low pressure, high pressure and electronic cycling switches are closed.
- Powertrain Control Module (PCM) 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.
