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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Technical Forums > Mechanical Maintenance: Break-in / Oil & Fluids / Servicing / Warranty > auxiliary belt vibration



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      10-11-2023, 03:15 PM   #1
Simbl
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auxiliary belt vibration

Having a belt noise. The belt vibrates at idle only, no other noise at any other rpm. When I turn off ac it stops. Ac works fine and makes no noise at any other rpm. I know the belt is old but look okay from what I can see. I don’t have power steering pump.

I’m thinking it’s the tensioner or the belt.

If it was the ac or the vibration damper it would be constant. But I’m not sure.

Has anyone else had this issue.

Video here:https://youtube.com/shorts/fEenR92-Q...AE2ylN1jBiO92c
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      12-20-2023, 07:59 AM   #2
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Anyone that wants to now I replaced the pulley on the alternator and harmonic damper.
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