- Coolant Temperature: If the coolant temperature is still high when you turn off the engine, the radiator fan may continue to run in order to cool down the engine.
- Faulty Coolant Temperature Sensor: A faulty coolant temperature sensor may be sending an incorrect signal to the engine control module (ECM), causing the fan to run even when it's not needed.
- Faulty Radiator Fan Relay: The radiator fan relay is responsible for turning the fan on and off. If the relay is faulty, it may cause the fan to run continuously.
- Wiring Issue: There may be a wiring issue that is causing the radiator fan to receive power even when the ignition is off.
- ECM Issue: In rare cases, the engine control module (ECM) may malfunction and cause the radiator fan to run continuously.
