What Causes Loud Car Fan Noise?
2 Answers
There are several reasons for loud car fan noise: 1. Excessive bearing wear: Check the radiator and surrounding components to see if the bearing is excessively worn. If so, simply replace the bearing. Also, check if the fan blades are rubbing against anything. If not, the fan is likely faulty, and replacing the fan bearing or coupling should resolve the issue. 2. Fan blades: Inspect the horizontal and vertical clearance of the motor rotor shaft. If no issues are found, remove the motor and fan to check for any deformation in the fan blades. Currently, most auto repair shops typically replace the entire motor. If the problem persists, open the motor to check if the rotor is rubbing against the stator.
I've been driving for so many years and have encountered situations where the fan noise was particularly loud a few times. Usually, it's because leaves or small stones got stuck in the fan blades, causing imbalance during rotation, which increases the noise. It could also be due to wear and aging of the fan bearings, making them dry and lacking lubrication. For older cars, the fan itself may have aged and rusted, naturally leading to louder noises. When the weather is hot, the engine temperature rises, and the fan starts more frequently, which can make the noise louder. But if it's significantly louder than before, there's definitely a problem. I suggest turning off the engine first to check for any debris around the fan and cleaning it thoroughly to see if that helps. If that doesn't work, don't delay—head to the repair shop immediately. A non-functioning fan can lead to engine overheating and serious trouble. Regularly cleaning the radiator area during car washes can help prevent such issues.
