Noise coming from rare differntial of my bmw 7 series while driving in slow speed and goes off when driving on 130 140

Comments

I would do a differential fluid flush. If that doesn't fix the problem you may have to replace it or live with the noise.

This is a common problem but there can be many causes:

 

1. A problem with the air conditioning belt

2. Problem with the auxiliary heater or the alternator

3. There might also be a problem with the oil seperator valve or similar gaskets or seals.

 

Have you tried a scanner?

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