2. Faulty Coolant Temperature Sensor: The coolant temperature sensor sends a signal to the engine control module (ECM) to turn on the coolant fan when the engine reaches a certain temperature. If the sensor is faulty or damaged, it may not send a signal to the ECM to turn on the fan, even if the engine is overheating.
3. Faulty Relay or Fuse: The coolant fan relay or fuse is responsible for supplying power to the coolant fan motor. If the relay or fuse is faulty or damaged, the coolant fan will not be able to receive power and will not operate.
4. Wiring Problems: Wiring issues can also prevent the coolant fan from working properly. Loose or disconnected wires, as well as faulty or corroded connections, can disrupt the flow of power to the coolant fan motor.
5. Faulty Radiator or Thermostat: A faulty radiator or thermostat can also affect the operation of the coolant fan. If the radiator is clogged or obstructed, it may not be able to properly cool the engine, leading to overheating. A faulty thermostat may also cause the engine to overheat by failing to open properly and allow coolant to flow through the system.
6. ECM Failure: In rare cases, the ECM itself may be responsible for the malfunctioning coolant fan. If the ECM is not functioning properly, it may not be able to send the necessary signals to turn on the fan, even if the engine is overheating.
