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 Compressor Clutch Relay
When HVAC control assembly A/C button is depressed or front defrost mode is selected, an A/C request signal is sent to the Body Control Module (BCM). The BCM then sends a class 2 message to the Powertrain Control Module (PCM) through the class 2 serial data circuit. The PCM internally grounds the A/C compressor clutch relay, closing relay contacts and sending voltage to compressor clutch coil for compressor operation. Compressor clutch relay is located in underhood electrical center. See Figure.
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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.