What to Do When the Car's Water Temperature is Normal but the Fan Keeps Running?
2 Answers
Check whether the antifreeze is insufficient, which may cause the engine's water temperature to rise. Also, inspect the circulation of the coolant to see if it is not flowing smoothly. Additionally, you can examine components such as the water temperature sensor, water pump, thermostat, and cooling fan, as these may also lead to high water temperature. If the car owner's DIY skills are not strong, it is best to take the car to a repair shop for inspection and maintenance.
I've encountered this car repair issue multiple times where the cooling fan keeps running despite normal engine temperature. There are several possible causes: a faulty thermostat switch, a stuck fan relay, or an abnormal control module. The thermostat switch is crucial for sensing coolant temperature—if it fails, it may erroneously send a signal to activate the fan. A jammed relay can cause continuous power supply to the circuit, preventing the fan from turning off. Alternatively, it could be due to an ECU (on-board computer) control error or a wiring short circuit.
First, check if the fan fuse in the fuse box has blown. If it's intact, use an OBD2 scanner to check for error codes, such as the common thermostat code P0115. Without a scanner, try removing the fan relay and shaking it to see if it's stuck—replacing a new relay is cheap, costing only 10-20 yuan. If the problem persists, visit a professional auto repair shop to inspect the thermostat and coolant temperature sensor. A continuously running fan drains the battery excessively, and prolonged operation may lead to battery depletion or fan motor burnout, which isn't cost-effective.
In short, if simple DIY checks don't resolve the issue, don't delay—get it repaired promptly.
