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      09-27-2012, 12:12 PM   #7
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Drives: 2011.75 M3 E92 6MT
Join Date: Mar 2011
Location: Austin, TX

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Originally Posted by Ghetto2315 View Post
Apparently, the Blue/Red knob in-between the vents is not for Cold/Hot.

The Blue side is to let ouside air in, while the Red side is inside air and only works for the front vents only. Not feet or windhield vents.

The example I was given was in the winter time, if you have the heat on your feet or windhshield, keep the knob on blue and it'll take air from the outside and blow through the front vents.

Not be to be confused with the re-circulate button
I'm pretty sure this is wrong, otherwise how would that be any different from the recirculate button? That would mean there are two ways to manage recirculation for the front vents and only one way for everything else?

I'm pretty sure that the winter driving scenario you observed wasn't because it was letting outside air in. Rather, it was doing exactly what I described above, namely heating the rest of the cabin but blowing cool air through the front vents since you had it on the Cold side.
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