1. Faulty Coolant Temperature Sensor: The coolant temperature sensor is responsible for sending signals to the engine control module (ECM) about the temperature of the coolant. If the sensor is faulty or damaged, it may provide incorrect temperature readings, causing the ECM to keep the radiator fan running even after the engine has stopped.
2. Problem with the Relay or Wiring: The fan relay acts as a switch that controls the power supply to the radiator fan. If the relay malfunctions or there is a problem with the wiring, the relay may get stuck in the "on" position, keeping the fan running continuously.
3. ECM Issues: In some cases, the problem could be with the ECM itself. If the ECM is faulty, it may fail to properly process the signals from the coolant temperature sensor or the fan relay, leading to the fan running even when it's not needed.
To troubleshoot the issue, you can check the electrical connections related to the fan and coolant temperature sensor, as well as test the sensor and relay to see if they are functioning correctly. If the problem persists, further diagnosis and possible replacement of the affected component(s) may be necessary. It is recommended to have the vehicle checked by a qualified mechanic to accurately diagnose and fix the problem.
