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Message: <blockquote data-quote="tank34" data-source="post: 11341" data-attributes="member: 1332"><p>Gents,  need some help trying to identify a problem with E46 325i (2003, 90+k's). I hear a low humming sound especially when the air conditioner is turned on. When I was a kid, I used to ride a bicycle fitted with a little dynamo that powers up the bicycle lamp, and it sounds similar to that. When you turn off the air-conditioner, the noise goes away, so suspect it is either fan belt, or some sort of tensioner. The sound is more audible inside the car then outside. I've gone through the forum and someone has suggested that it could the alternator, but like i said, only comes on when the air-cond is turned on. Any suggestions?</p></blockquote><p></p>