What Causes the Loud Noise from the Front Fan of a BMW 5 Series?

1 Answers
DelJustin
07/30/25 1:42am
BMW 5 Series front fan noise issues are typically caused by carbon buildup, excessively low coolant temperature, or shock absorber problems. Here are the details: 1. Carbon buildup: As engine oil ages, it becomes thinner, leading to increased carbon deposits. Thin oil readily mixes with contaminants, accelerating carbon accumulation which significantly reduces engine power. When new oil is introduced, the engine may struggle to adapt to the changed viscosity, potentially causing higher RPMs and consequently louder engine noise. 2. Coolant: When coolant temperature drops too low, it triggers abnormal engine noise. Timely inspection and replacement are crucial to prevent further complications. 3. Shock absorbers: When driving over speed bumps, faulty shock absorbers can manifest as pronounced engine noise.
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