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What Causes the Belt Pulley Noise in Mercedes-Benz?

2 Answers

JakeLynn

08/30/25 5:00am

Mercedes-Benz belt pulley noise is caused by loose belts or poor quality. Water test method for diagnosis: There are multiple belts in the car. Start the engine and pour some water on the belts. If the noise disappears, it indicates an issue with that particular belt. Check whether it's due to looseness or quality problems. Sound diagnosis method: Identify problematic belts by listening to sounds. If noise occurs when turning on the AC, it might be the air conditioning compressor belt. If noise appears when steering, it could be the power steering pump belt. If noise occurs during cold starts, then the engine belt is likely the issue.

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NadiaAnn

09/12/25 2:12am

Last year when I was driving my Mercedes-Benz C-Class, the pulley started squeaking, which really freaked me out. I asked a car-savvy old friend, and he analyzed that belt issues are quite common in Mercedes vehicles, usually caused by the belt itself being worn, cracked, or too loose and slipping. A loose belt can create noise from friction with the pulley, and it’s worse if the tensioner is faulty or seized, leading to belt misalignment or overheating. Oil residue on the belt that wasn’t cleaned properly is also a culprit, especially in humid summers. He suggested checking the belt’s condition visually as soon as possible—look for cracks or splits, and gently test the tension by pulling and pressing (but not too hard to avoid damaging engine components). Start the car in a quiet place to listen for the noise source, and if you can’t handle it yourself, take it to a proper repair shop with professional tools. Delaying repairs could damage the car and be dangerous. Regularly replacing the belt during maintenance can save a lot of trouble.

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