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What are the reasons for the loud fan noise in BMW e90 engine?

2 Answers

McEmily

08/28/25 4:20am

BMW e90 engine fan noise may be caused by the following reasons: Possible excessive bearing wear: Inspect the radiator and surrounding components to check for excessive bearing wear. If damaged, simply replace the bearing. Examine whether the cooling fan blades are rubbing against anything. If not, the fan is likely damaged, and replacing the fan bearing or coupler should resolve the issue. Poor fan cooling performance: This may be related to the fan belt or blade balance issues, or possibly due to a dirty radiator causing poor heat dissipation, which affects air intake volume. This leads to increased electronic fan speed and consequently louder wind noise. This problem does not affect daily usage. Clean the radiator and fan blades, and check for loose fan mounting screws. If the issue persists, directly replace the car's cooling fan.

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ClaytonDella

09/10/25 2:49am

My BMW E90 also had the issue of loud fan noise before, and it took me a long time to figure it out. This situation is mostly caused by a problem in the cooling system, such as the radiator being clogged with dust or poor coolant circulation, forcing the fan to ramp up its speed to cool things down. It could also be due to aging fan bearings, making a squeaky noise when spinning. The problem is most noticeable when using the AC in summer because the compressor generates additional heat. I recommend first checking the coolant level and whether the front radiator fins are clean. If that doesn’t help, you might need to measure the fan motor bearing clearance. Don’t ignore it—if the fan fails completely, the engine could overheat and stall. I had this happen on the highway once, and it was terrifying.

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