Why is the engine fan particularly loud?
2 Answers
The main reasons for the engine fan being particularly loud are as follows: Lack of lubrication in the blower bearing: It may be due to a lack of lubrication in the blower bearing or the presence of foreign objects inside the blower. The solution is to add lubricating oil to the blower bearing. If the noise is caused by foreign objects, simply remove them. If the above methods do not resolve the issue, replacing the blower with a new one may be necessary. Noise from the compressor belt: The noise could be due to a damaged tensioner pulley of the compressor belt or a malfunctioning compressor. This type of noise is usually located in the engine compartment and is easy to identify.
The engine fan suddenly becomes very noisy, and I've encountered this situation several times. It's usually an issue with the fan assembly. The most common problem is bearing wear, causing a squeaking or grinding noise when the fan rotates, especially when the engine is hot, as these components tend to degrade over time. Another possibility is dirty fan blades, where dust or leaves get stuck, causing imbalance and a humming sound. A loose fan belt can also create loud friction noises, which become more noticeable when accelerating. Additionally, electrical faults are not uncommon—a faulty relay might cause the fan to spin wildly, producing a whistling sound. I recommend first checking the fan area for any obstructions yourself, then using a stethoscope to locate the noise source. If no obstructions are found, it's best to visit a repair shop promptly to avoid prolonged damage that could burn out the motor and lead to more serious issues. After all, fan noise isn't just annoying—it signals potential risks, and safety comes first.
