What Causes the Loud Noise from the Car Cooling Fan?
2 Answers
The cooling fan blades becoming deformed or the motor being damaged can cause the cooling fan to produce particularly loud noises. Below is relevant information about the car radiator cooling fan: 1. The fan is not controlled by the key: The cooling fan is directly connected to the battery, so as long as the battery has power and the engine temperature is high, it will continue to operate until the temperature drops. This is because the set values in the shutdown state and the driving state are different. 2. While driving, the fan starts working when the temperature exceeds 100 degrees and stops at 85 degrees: When the engine is off, it starts working at 105 degrees and stops at 85 degrees. When the engine is started again, it switches to driving mode. Since the fan stops working below 100 degrees, after shutting down again, it certainly won't reach 105 degrees, and the fan naturally won't operate.
When the cooling fan suddenly becomes louder while driving, I think it might be due to leaves, debris, or dust stuck in the fan blades, causing unbalanced rotation and resulting in noise and vibration. In summer, when the air conditioning is on and the engine is hot, the fan spinning at high speed is normal and may produce some noise. However, if it becomes unusually loud, extra attention is needed. Worn bearings or motors can produce loud squeaking sounds. I once experienced a loose fan shroud causing severe vibration and a roaring noise. Ignoring this issue increases the risk of poor cooling, leading to engine overheating and breakdown. It is recommended to regularly clean around the fan, inspect the blades for damage, and replace parts if necessary to maintain the full functionality of the cooling system.