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E90/E92/E93 M3 (2008 - 2014)
4th generation E90 M3 sedan, E92 M3 coupe and E93 M3 convertible. The last of the naturally aspirated M3s, powered by a 4.0 liter V8 making 414hp and 295 lb-ft of torque.

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Old 02-28-2013, 12:00 PM
Oliviam3 Oliviam3 is offline
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What's the purpose of this button on my E90 M3?

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Hi all, first time posting here (first time posting on any forum i believe )
Anyway, i've had this car for a long time, but never figured out the purpose for this particular button. This is also my first bmw, so please don't laugh too loud if my question is really dumb
I know what the button does (cooler air if roll towards blue, warmer air if roll towards red), but why? If all I want to do is adjusting temperature, why not just turn the knob and adjust the temperature setting?
i searched thru the manual, but don't think that button is even listed

Last edited by Oliviam3; 02-28-2013 at 12:03 PM.
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Old 02-28-2013, 02:04 PM
edge9 edge9 is offline
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This is directly from the E92 manual…

Knurled wheel for more or less cool air from the vents for the upper body area.

So if you have the automatic system set and it is heating the interior, you can turn the wheel and have relatively cooler air be directed to your face or upper areas if that is more comfortable. That being said I usually don’t mess with it.
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Old 02-28-2013, 05:04 PM
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MMME30W MMME30W is online now
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Quote:
Originally Posted by edge9 View Post
This is directly from the E92 manual…

Knurled wheel for more or less cool air from the vents for the upper body area.

So if you have the automatic system set and it is heating the interior, you can turn the wheel and have relatively cooler air be directed to your face or upper areas if that is more comfortable. That being said I usually don’t mess with it.
Correct...The temp setting is for overall setting, the mix dial controls the air you get to your face...works well.

OP, welcome to the fest!
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Old 02-28-2013, 04:15 PM
mjposner mjposner is offline
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I can tell you that the same switch goes back 30 years, long before auto climate.
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Old 02-28-2013, 05:42 PM
tsbrown tsbrown is offline
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I remember from the owners manual of my E36 about 20 years ago it stated the reason for having this was so that you could blow cool air to the face to help keep you more alert, without making the ambient temp too cool for everyone else. It works very well at that.

I use this feature all the time on my M3 (and all my past BMWs) but really miss it when driving my wife's Audi that doesn't have it.
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