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Message: <blockquote data-quote="Herbert" data-source="post: 449851" data-attributes="member: 18029">Bo,Bimmer73 had almost similar problem with his e39 i.e aux fan spinning fast & loud & no power during acceleration.  His aux fan was spinning fast within minutes after switching on air-cond.  He checked with few workshops and some said temp of thermostat is lower (UK specs) thereby causing aux fan to spin faster, aux fax going to kong etc etc.  Two days ago, he took his car to Naidu-under-the tree (BMW air-cond specialist) and detected that air-cond compressor was the cause of the problem.  After replacement of new air-cond compressor, aux fan spin rate became normal and acceleration improved tremendously.</blockquote>