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well my 95 520i for the last 10 months is sending me bust please help.............it all started early last year a noise coming from the air con. pully with poor performance with the air con. on, i have since found out that the chattering coming from the air con area is causing the knock sensers to retard the timing with the air con on , when the air con is off the car goes A1, now ive had the car to two top line dealers with the following parts replaced at great expense 1st a reco comressor then the idle control valve then the idler pully then the automatic belt tensioner ,today i took the car back and got a brand new A$1300 compressor fitted with no change to the car, the noise coming from this area is getting louder yet my BMW dealers seem to be only guesing , please has anyone else experienced this problem ...HELP me fellow bimmer lovers