What causes car fan to smoke?

[McJanelle]

Possible causes include fan circuit malfunction or coolant leakage. It is recommended to visit a 4S shop for repair. Additional information is as follows: 1. Fan operation principle: Automatically activates or stops based on coolant temperature. At high speeds, the air pressure difference between the front and rear of the vehicle is sufficient to maintain proper coolant temperature without fan operation. Causes of car fan failure include: 1. Faulty coolant temperature relay: Replace if there's poor contact or no response. 2. Damaged thermostat switch: Prevents fan activation when coolant temperature is high. 3. Fan damage: May be caused by overload or short circuit burning - requires immediate replacement. 4. Wiring issues: Short circuits or broken circuits will generally cause fan failure.

[StJasmine]

That day, smoke suddenly came out from under my car's hood while driving, which scared me to death. It turned out the cooling fan had burned out. The fan is responsible for cooling the engine, and the motor overload causing smoke might be due to prolonged high-temperature operation or dust blockage preventing it from spinning. I quickly stopped the car and turned off the engine. After it cooled down, I found the fan bearing was stuck. The mechanic said common issues include short circuits in the wiring, motor failure, or dirt buildup. Once smoke appears, it could lead to a fire hazard and must be dealt with immediately. Remember to regularly clean the fan blades, especially after driving on rural dirt roads, to prevent dust buildup from burning out the motor. That time, it cost me 200 yuan to fix, but I learned the importance of regular maintenance to save big money in the long run.

[NatalieFitz]

Common causes of car fan smoking include overheating of the fan motor. Worn brushes in the motor may produce sparks and smoke, or poor wire connections could cause short-circuit fires. Insufficient bearing lubrication can also generate smoke due to high friction temperatures. From my own repair experience, other frequent causes include foreign objects jamming the fan blades or voltage surges burning out the coils. If this occurs, immediately turn off the AC and engine - forcing operation may lead to engine overheating and cylinder damage. Visit an auto repair shop to inspect fuses, motors, or wiring. For prevention, check fan operation seasonally and apply lubricant annually. Address minor issues promptly - safety comes first.

[PiperLee]

Smoke from the fan usually indicates a faulty fan. I encountered this issue with my old car—the fan motor burned out and smoked due to high friction from a seized bearing. After stopping immediately, I checked and found the blades clogged with dust, preventing rotation. Replacing the fan solved the problem. Be cautious as smoke could lead to a fire.