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Old 02-28-2013, 02:04 PM
edge9 edge9 is offline
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Location: Fountian Hills, AZ
Join Date: Jun 2009
Posts: 78
Mein Auto: 2013 E92 M3
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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