Strange sound/noise after hard driving

BarryC · 03-24-2009, 07:44 AM

I say strange because it sounds like a cooling fan that is running behind the driver side REAR wheel. I would expect it coming from under the hood but not the back of the car.

It happens after I've driven the car hard and park it. When I get out, I hear a fun running behind the rear wheel. Something to cool the diff? Thoughts comments???

Thanks,
BC

sgar0777 · 03-24-2009, 08:28 AM

Same thing for me, I am interested in what it is too...

alpineweissM3 · 03-24-2009, 08:42 AM

Now this is one I've never heard! I can tell you there is no fan to cool the diff.

Can't wait to see what it could be......

sparkyg · 03-24-2009, 10:33 AM

battery fan, all the cars have them. Exhausts any gases that may have collected or will collect as the battery cools.

BarryC · 03-24-2009, 11:25 AM

Quote:

Originally Posted by sparkyg

battery fan, all the cars have them. Exhausts any gases that may have collected or will collect as the battery cools.

Are you sure about this? Battery's on the passenger side and the sound is on the driver's side. I can hear it distinctly when I kneel down beside the driver side rear wheel and the sound diminishes as I go to the other side of the car. So I'd be surprised if it's associated with the battery. This is my 7th new BMW over the past 10 years and I've never heard this before....

BC

sparkyg · 03-25-2009, 07:26 AM

Your' right, I heard the fan sound on the passenger side of my 335, maybe the vent is routed differently on the M3

mxracer · 03-25-2009, 01:14 PM

I've heard this on mine as well, anyone know?

alpineweissM3 · 03-26-2009, 06:16 AM

O.K....very weird. Until last night, I hadn't heard this so called fan. I can't imagine it has anything to do with the battery. As previously stated, the battery is on the other side.

Anyone else have thoughts on this?

03-24-2009, 07:44 AM	#1
BarryC Major 121 Rep 1,198 Posts Drives: '15 M3 Join Date: May 2007 Location: Kernersville NC iTrader: (12)	Strange sound/noise after hard driving I say strange because it sounds like a cooling fan that is running behind the driver side REAR wheel. I would expect it coming from under the hood but not the back of the car. It happens after I've driven the car hard and park it. When I get out, I hear a fun running behind the rear wheel. Something to cool the diff? Thoughts comments??? Thanks, BC __________________ '15 M3, '16 911 Turbo S Cab
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03-24-2009, 08:28 AM	#2
sgar0777 Private 10 Rep 75 Posts Drives: 2009 E92 M3 AW/BLK 6MT Join Date: Oct 2008 Location: Alpharetta, Ga. iTrader: (0)	Same thing for me, I am interested in what it is too...
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03-24-2009, 08:42 AM	#3
alpineweissM3 I love my beautiful wife! 22 Rep 628 Posts Drives: e90 ///M Join Date: Oct 2007 Location: Pittsburgh iTrader: (0)	Now this is one I've never heard! I can tell you there is no fan to cool the diff. Can't wait to see what it could be......
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03-24-2009, 10:33 AM	#4
sparkyg Brigadier General 142 Rep 3,523 Posts Drives: A6 Allroad Join Date: Sep 2007 Location: Oil Country iTrader: (5)	battery fan, all the cars have them. Exhausts any gases that may have collected or will collect as the battery cools.
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03-25-2009, 07:26 AM	#6
sparkyg Brigadier General 142 Rep 3,523 Posts Drives: A6 Allroad Join Date: Sep 2007 Location: Oil Country iTrader: (5)	Your' right, I heard the fan sound on the passenger side of my 335, maybe the vent is routed differently on the M3
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03-25-2009, 01:14 PM	#7
mxracer New Member 0 Rep 6 Posts Drives: White E92 M3 Join Date: Mar 2009 Location: CA iTrader: (0)	I've heard this on mine as well, anyone know? __________________ 08 White E92 M3 /// Mods: CF Mirrors, Vorsteiner CF Lip, Rear Defuser, Trunk, Black Kidney Grilles, HRE P40's
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03-26-2009, 06:16 AM	#8
alpineweissM3 I love my beautiful wife! 22 Rep 628 Posts Drives: e90 ///M Join Date: Oct 2007 Location: Pittsburgh iTrader: (0)	O.K....very weird. Until last night, I hadn't heard this so called fan. I can't imagine it has anything to do with the battery. As previously stated, the battery is on the other side. Anyone else have thoughts on this?
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