1. Check the Coolant Level: Open the coolant reservoir and check the coolant level. If it's low, add the appropriate coolant mixture as recommended in the owner's manual.
2. Inspect Cooling System: Visually inspect the cooling system components, including hoses, radiator, and water pump, for any signs of leaks or damage. Repair or replace any faulty parts if necessary.
3. Check Electrical Connections: Ensure that all electrical connections related to the cooling fan are secure and not corroded. Clean or replace any problematic connectors.
4. Test Thermostat: Remove the thermostat and test it by placing it in a pot of boiling water. If the thermostat does not open, replace it with a new one.
5. Check Fan Operation: Disconnect the fan's electrical connector and apply direct power from a 12V source. If the fan doesn't spin, replace the fan motor.
6. Check the Coolant Temperature Sensor: Locate the coolant temperature sensor (CTS) and disconnect its connector. Measure the resistance of the sensor using a multimeter. If the readings are incorrect, replace the CTS.
7. Inspect Fan Relay: Remove the fan relay and check its contacts for damage or corrosion. Clean the contacts or replace the relay if needed.
8. Examine Wiring: Thoroughly inspect the wiring harness related to the cooling fan system for any cuts or breaks. Repair or replace the wiring as required.
9. Check Fuses: Locate the fuses related to the cooling fan system and ensure they are not blown. Replace any faulty fuses.
10. Professional Help: If you are unable to identify and resolve the issue after following the above steps, it is recommended to consult with a qualified mechanic or automotive technician for further diagnosis and repair.
