Apparently unusual fan noise (when the air-con is on) could be due to leaves being sucked into the air inlet for air-conditioning. I just had mine looked at by BMW Melbourne yesterday, they cleaned it and now it is back to normal.
BMW Germany has come up with a net to cover the inlet to prevent re-occurrence but mine is on back order. So I am guessing with autumn and tree leaves on the street I will be getting that noise again soon.
This is different to the compressor that makes funny noises every now and then - at least for me.
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