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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Technical Forums > Mechanical Maintenance: Break-in / Oil & Fluids / Servicing / Warranty > Aux fan spooling up with heater???



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      03-29-2014, 12:52 PM   #1
WOT Bimmer
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Aux fan spooling up with heater???

Hey guys,

I got into my 2007 328xi w/ 80k, and all was normal until I turned the heater on because it was cold this morning. As soon as I did that the auxiliary fan spooled up, went off, and it has continued this pattern all morning. If I shut the heater off the aux fan immediately shuts off. I have no SES or warning lights of any sort. The coolant is also topped off.

Any ideas what might be causing this? I was going to guess a water pump, but whether or not the heater is on is irrelevant if that was the case. I stumped the tech at the dealer this morning too. :-(

Thanks guys!

Last edited by WOT Bimmer; 03-29-2014 at 01:23 PM.
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      03-31-2014, 01:52 PM   #2
WOT Bimmer
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About one hour after this post my temp gauge came on and my water pump was out. Guess that answers it....
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      04-02-2014, 11:20 AM   #3
Sidewinderpb
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Yup. That's the infamous water pump failure.

Happened to me last month. I brought it to the dealer without taking my mods off (except the intake), and they warrantied it without question.
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