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      01-05-2021, 10:16 AM   #16
Got f1?
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Drives: 06 E46 ZHP, 20 X3M, M2CS
Join Date: Jan 2007
Location: Ohio

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That is a uniquely BMW thing. It does just as you said: change temp of the center vent. Why? I have no idea but to help blend different temp air from those vents. I kind of like it. Our 1999 E46 has it, not sure how far back BMW did this.
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