I am Teh Edumacator.
Join Date: May 2005
Location: ATL, London, and Barcelona
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I assume you mean the belt-driven fan rather than the electrical auxiliary pusher fan. You might check the fan clutch. If there is brownish-looking dust on its vent fins or if it wiggles back and forth slightly when the car is running, then you have a busted fan clutch. This is a common ailment on our cars. I replaced mine a few months back and it cost me about $250.
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1999 E39 540i/6-VF Stage 1 S/C, Dinan exhaust, Dinan strut+shock braces, Dinan ltwt flywheel + clutch, Dinan Brembo BBK, Dinan monoball, H&R Springs, Koni Yellows, M5 sways, Dinan forged 18" wheels, &c.
1995 E38 740i. Highly modded. Faster than you.
Sold 2-28-07: 1997 E36 M3/4, 8-30-05 RIP 1997 528i
Lindsay fan club member.