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Message: <blockquote data-quote="Galaxy7" data-source="post: 524446" data-attributes="member: 19219">might be aircond belt tensioner. common problem to e36 and e39. i changed mine last time to new unit together with aircond belting but can stand for 1 week only. after 1 week bunyi again. now i'm using custom aircond tensioner, get it from Naidu (PJ, behind Shell jln gasing). now enjin very senyap and sungguh merdu.u can test by start the engine and turn off the aircond to confirm it is related to aircond or not.if no sound after turn off the aircond then it might be the aircond belt tensioner or aircond belting or aircond compressor.</blockquote>