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 C-12: Engine Cooling Fan (L Body): Notes
Battery voltage to operate the cooling fan motor is supplied to relay circuit No. 2. Ignition voltage to energize the relay is supplied to relay by circuit No. 39. When the ECM grounds circuit No. 335, the relay is energized and the cooling fan is turned on. When the engine is running, the ECM will turn the cooling fan on if:
- A/C system is on.
- Coolant temperature is greater than 230°F (108°C).
- Code 14 or 15, coolant sensor failure exists.
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.