How to Diagnose a Radiator Fan That Keeps Running With Car off
If your radiator fan keeps running with the car off, start by checking the coolant temperature sensor and thermostat.
Faults in these components can cause the fan to run continuously.
Next, test the fan relay and inspect the wiring for stuck relays, corrosion, or damage.
Also, keep an eye on your battery’s health, as prolonged fan operation may drain it.
Understanding these basics will help you pinpoint the issue and decide if professional help is needed.