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Old 10-10-2012, 04:54 AM
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16valex 16valex is offline
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Location: New York
Join Date: Jul 2004
Posts: 3,301
Mein Auto: 530I/Stick Blown
Originally Posted by Tiko530 View Post
I have a 2003 530i, today while parked in the driveway I noticed a very low but audible noise coming from the front when I was in the car. It sounded almost like an airplane powering up to take off, it would increase in pitch for a few seconds stay flat then lower in pitch and go away, and would repeat itself a few times. I'm assuming it was some sort of vacuum noise. Very low volume but definitely audible in a quite setting with the radio off, I noticed it again while driving the vehicle later.

Is this a normal noise or something I should be concerned about?
It's your aux fan doing its job, nothing to worry about, perfectly normal.
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