hello!
To start with, here is the wiring diagram for the compressor clutch circuit on your vehicle:
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Here is the location of the compressor clutch relay:
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You will note that the compressor clutch circuit is controlled by the vehicle's engine control module. The ECM grounds circuit #459 to turn the compressor clutch relay on. The compressor clutch relay then completes a connection between circuit 59 and 248 to apply power to the compressor clutch.
you will need to use a test light or DVOM to dtermine where power is being lost in the circuit. If everything seems to test OK, try using a jumper wire to groiund pin#1 of the relay; if this causes the compressor to come on and run, then the problem is in the ECM controls; from that point you will need to have a scan tool capable of displaying teh live data as seen through the ECM to diagnose any further. (Note: do NOT replace the ecm if this is the case; ECM's rarely fail in this way. it is more often a sensor value out of normal operating range, causing teh ECM logic to disable compressor clutch operation. ECM inputs that affect compressor operation are RPM, TPS, PS pressure, AC refrigerant pressure, and HVAC switch position.)
If you determine that you do NOT have power in some part of the circuit where it should be present, let me know what point this is and I can try to help you diagnose the possible cause.
