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.
A/C Clutch Relay
With ignition switch in "RUN" position, leave A/C clutch relay connected. Connect a voltmeter between, relay terminal No. 86 and ground. See Figure . Voltmeter should read battery voltage. If battery voltage is present, go to next step. If battery voltage is not present, check fuse No. 8. If fuse No. 8 is okay, check for an open circuit to fuse No. 8.
2) Connect voltmeter between relay terminal No. 30 and ground. See Figure . Voltmeter should read battery voltage. If battery voltage is present, go to next step. If battery voltage is not present, check fusible link in circuit. If fusible link is okay, check for an open circuit to fusible link.
3) Connect voltmeter between relay terminals No. 86 and 85. See Figure . Voltmeter should read battery voltage. If battery voltage is present, go to next step. If battery voltage is not present, check for an open circuit to Air Control Module (ACM) connecter terminal "C5". If circuit is okay, replace Air Control Module (ACM).
4) Connect voltmeter between relay terminals No. 30 and 87. See Figure . A/C compressor clutch should engage. If A/C compressor clutch engages, replace A/C clutch relay.
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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.