1. Coolant temperature sensor failure: The coolant temperature sensor (CTS) is responsible for sending a signal to the engine control unit (ECU) about the temperature of the engine coolant. If the CTS fails or malfunctions, it may send an incorrect signal to the ECU, causing the fan to stay on even after the engine is turned off.
2. Faulty fan switch: The fan switch is a temperature-controlled switch that turns on the fan when the engine coolant reaches a certain temperature. If the fan switch is faulty, it may not turn off the fan when the engine coolant temperature drops below the set threshold, causing the fan to run continuously.
3. Stuck thermostat: The thermostat is a valve that regulates the flow of coolant between the engine and the radiator. If the thermostat is stuck in the closed position, it can prevent the coolant from circulating properly, causing the engine to overheat and the fan to stay on.
4. Cooling system problems: Other problems with the cooling system, such as a clogged radiator, a faulty water pump, or a coolant leak, can also cause the engine to overheat and the fan to run continuously.
To diagnose the exact cause of the issue, it is recommended to have the vehicle inspected by a qualified mechanic who can perform tests on the cooling system and identify the root cause of the problem.
