A/C Compressor Clutch Controls (Except 1.9L & 3.0L)

NOTE: For A/C compressor clutch circuit testing, see appropriate MANUAL A/C-HEATER SYSTEMS article in AIR CONDITIONING & HEATING. See appropriate SYSTEM WIRING DIAGRAMS article for terminal and wire color identification.

To provide improved idle quality, maintain Wide Open Throttle (WOT) performance and provide A/C system protection, compressor clutch is controlled by PCM.

For proper control of cooling fans, compressor clutch and Idle Air Control (IAC) valve, a refrigerant pressure sensor is used. PCM uses signals provided by sensor to monitor high and low side refrigerant pressures. If PCM detects a fault in refrigerant pressure circuit, compressor clutch will be disabled.

The A/C compressor clutch relay is controlled by PCM. This allows PCM to raise idle speed before engaging compressor clutch, or disable compressor clutch during WOT, high engine RPM, high power steering loads and hot engine restarts. PCM also disables compressor clutch if coolant temperature becomes excessive. For location of A/C compressor clutch relay, see A/C COMPRESSOR CLUTCH RELAY LOCATION table.

A/C COMPRESSOR CLUTCH RELAY LOCATION

Application	Location
"C" Body	Right Front Of Engine Compartment, In Fuse/Relay Block
"E" & "K" Bodies	In Underhood Fuse/Relay Block
"F" Body	In Underhood Electrical Center, On Left Inner Fender Panel
"H" Body	Center Rear Of Engine Compartment, Below Right-Side Maxifuse Block
"J" Body	In Underhood Fuse/Relay Block, At Left Front Of Engine Compartment
"N" Body	In Underhood Junction Block, In Left Side Of Engine Compartment
"W" Body	In Underhood Electrical Center, At Right Front Of Engine Compartment
"Y" Body	In Underhood Electrical Center, In Front Of Battery

WARNING: Vehicles may be equipped with a PCM using an Electronically Erasable Programmable Read Only Memory (EEPROM). When replacing PCM, the new PCM must be programmed.

NOTE: To help save diagnostic time, check for blown fuses or fusible links before proceeding with any testing. If fuses are blown, locate and repair short circuit before replacing fuses. Ensure all related relay and wire harness connections are clean and tight. Repair as necessary.