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      11-02-2012, 02:56 AM   #23
Dackelone's Avatar
Drives: 135i Silber mit/Rot 6MT N54
Join Date: Feb 2010
Location: Bayern, Germany

Posts: 16,127
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Originally Posted by vito747 View Post
HVAC = Heating, Ventilation, and Air Conditioning

I was talking about the air coming out of the center vents. When you go WOT for as long as we can over here on the Autobahns... after a long time, the vacuum stored in the vacuum res will be depleted and the air output will default to the windshield vents (ie defrost mode).
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