Some motor noise in the cabin after engine is on

zag · 03-04-2009, 09:40 PM

i am on e90 M3 2009 model...
after the engine is cranked... 10 to 20 seconds later there is a motor noise (sounds like mirror tilt motor in action) in the cabin. seems to come from the left hand side of dash area but not sure due to aural dimension at play (i am on right hand drive version).

anyone knows where this motor like noise come from? something is initialising it seems

spyderco10 · 03-04-2009, 10:30 PM

something to do with the a/c I think?

MysticBlue · 03-04-2009, 11:41 PM

I've been asking this question for quite some time.
http://www.m3post.com/forums/showthread.php?t=191307

JIO · 03-05-2009, 12:29 AM

When the engine is cold an air pump will start under the hood and run for about 30 seconds. It turns off and then never comes back on again while the motor is warm. It's to help reduce emissions. For me it sounds like a jet taking off.

As to the vents, when the car is cold, the car automatically directs the airflow to the floor instead of your face, until the heat comes up, and then it reverts back to the dash vents. It's purely for your comfort on a cold day.

03-04-2009, 09:40 PM	#1
zag New Member 1 Rep 9 Posts Drives: e90 M3- Oct' 08 build Join Date: Jul 2008 Location: singapour iTrader: (0)	Some motor noise in the cabin after engine is on i am on e90 M3 2009 model... after the engine is cranked... 10 to 20 seconds later there is a motor noise (sounds like mirror tilt motor in action) in the cabin. seems to come from the left hand side of dash area but not sure due to aural dimension at play (i am on right hand drive version). anyone knows where this motor like noise come from? something is initialising it seems
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03-04-2009, 10:30 PM	#2
spyderco10 Colonel 63 Rep 2,426 Posts Drives: AW E92 M3 6MT Join Date: Jul 2008 Location: Honolulu, HI iTrader: (0)	something to do with the a/c I think? __________________ “For God so loved the world that he gave his one and only Son, that whoever believes in him shall not perish but have eternal life.” - John 3:16
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03-04-2009, 11:41 PM	#3
MysticBlue Lieutenant Colonel 369 Rep 1,887 Posts Drives: '20 M5C, '09 M3 DCT Coupe Join Date: Apr 2008 Location: Eastern Oregon... They call 'em rigs here iTrader: (0)	I've been asking this question for quite some time. http://www.m3post.com/forums/showthread.php?t=191307
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03-05-2009, 12:29 AM	#4
JIO Captain 48 Rep 636 Posts Drives: '09 Space Gray E92 M3 w/DCT Join Date: Aug 2005 Location: Eugene, Oregon iTrader: (0)	When the engine is cold an air pump will start under the hood and run for about 30 seconds. It turns off and then never comes back on again while the motor is warm. It's to help reduce emissions. For me it sounds like a jet taking off. As to the vents, when the car is cold, the car automatically directs the airflow to the floor instead of your face, until the heat comes up, and then it reverts back to the dash vents. It's purely for your comfort on a cold day.
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