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BMW 3 Series making a strange noise

My 2011 BMW 3 Series is making a strange a whirring noise when the air con is switched on. This noise becomes noticeable when the engine reaches around 1500rpm and it seems to be synchronised with the throttle movement. This happened soon after I had the air con regassed. Any idea what's causing the noise?

Asked on 7 June 2015 by Ewu

Answered by Honest John
The air con pump. Could be that they also re-tensioned the aux belt and tensioned it too tight.
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