Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Chart C10A - A/C Clutch Control (2.8L)
The A/C clutch control relay is ECM controlled to Delay A/C clutch engagement .4 seconds after A/C is turned on. This allows the IAC to adjust engine RPM before the A/C clutch engages. THe ECM also causes the relay to disengage the A/C clutch during WOT operation. The A/C clutch control relay is energized when the ECM provides a ground path for circuit 905.
- Checks to see if the ECM is controlling the A/C clutch control relay.
- This test checks operation of A/C cycling switch.
- This test checks for grounded circuit 905 to ECM. At this point the test light should be off.
- If the ECM recognizes a high power steering pressure the A/C clutch relay will be de-energized. The ECM will pulse circuit 905 on and off to de-energize the relay. This would cause a blinking test light when circuit 905 was tested.
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.