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E90/E91/E92/E93 (2006 - 2013)
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Old 12-16-2013, 05:34 PM
AndrewHA AndrewHA is offline
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Location: Chicago
Join Date: Aug 2013
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Mein Auto: BMW 335xi Coupe
Loud Radiator Fan

I stopped at a red light yesterday and was thinking to myself, "that is one loud truck next to me". The truck pulled away, but the noise stayed. Open my window and heard that it was my car. I pulled over and opened the hood and the radiator fan was going nuts. It might have been normal if it was summer, but it's like 10F outside right now and the engine temp was at about 180F. I also felt some power loss on acceleration before I pulled over. I turned the car off and it has been fine since, but I'm kind of worried.

What does this mean? Is my water pump or thermostat going bad? Car has 50k miles.
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Old 12-16-2013, 09:26 PM
fdriller9 fdriller9 is offline
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Mein Auto: '06 AW 330xi
Water pump is most likely on it's way out.

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Old 12-17-2013, 02:47 AM
hondo402000 hondo402000 is offline
Location: Charlotte, NC
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Mein Auto: 2007-335 HTC
I doubt its the water pump motor, at 50K miles, I doubt, if you run the AC in the winter like I do the fan will run wide open
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Old 12-17-2013, 05:08 AM
wenliang_wang wenliang_wang is offline
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Location: china
Join Date: Jan 2013
Posts: 24
Mein Auto: e90 325i
don't forget checking transmission oil temp. if what you mentioned is ok.
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