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 C12A - Engine Cooling Fan (J/N Body)
Battery voltage is supplied to fan control relay terminal E and ignition terminal C. Grounding circuit No. 335 will close relay and is controlled by fan temperature switch when A/C is off or vehicle speed is above 30 MPH. When A/C control switch is on and compressor high side low pressure switch is closed, circuit No. 901 will provide ignition voltage to terminal A of A/C fan relay.
If vehicle speed is less than 30 MPH, ECM terminal 9 and circuit No. 409 are grounded. The A/C fan relay coil is grounded closing relay which in turn grounds circuit No. 335.
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.