update
the shorter belt 6PK 1660 installed few days ago and everything went well till now after 300miles. noise stopped immediately so now i am 100% sure that it was coming from the a/c compressor (again I remind you that noise existed when a/c was not on! )
will try to uninstall its' clutch during the following days.
thanks!
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F30 mineral grey N47 ed
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