Aux fan spooling up with heater???

WOT Bimmer · 03-29-2014, 11:52 AM

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!

WOT Bimmer · 03-31-2014, 12:52 PM

About one hour after this post my temp gauge came on and my water pump was out. Guess that answers it....

Sidewinderpb · 04-02-2014, 10:20 AM

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.

03-29-2014, 11:52 AM	#1
WOT Bimmer Major 1227 Rep 1,126 Posts Drives: 2018 BMW M2 Join Date: Jan 2013 Location: Columbus Ohio iTrader: (3)	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 12:23 PM..
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03-31-2014, 12:52 PM	#2
WOT Bimmer Major 1227 Rep 1,126 Posts Drives: 2018 BMW M2 Join Date: Jan 2013 Location: Columbus Ohio iTrader: (3)	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, 10:20 AM	#3
Sidewinderpb Banned 329 Rep 1,739 Posts Drives: 2017 340i xDrive 6mt Join Date: Nov 2013 Location: CT iTrader: (7)	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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