hi new on here got this faint rattle at idle on my car audi a4 1.9tdi 54 plate BKE
if i put the air con on it goes away turn air con off and its back any checked the air con pulley and thats fine bolt in the middle is not loose air con works fine so im thinking it could be the aux belt tensioner i think my car has one belt driving power steering pump`aircon and alternator had the pulley changed on the alternator about a year ago genuine part fron audi so any ideas people thanks beforhand