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The roller wheel isn't an absolute temperature control, it is an offset control from the cabin setting, and only applies to the centre vents. Each dot is one degree! For slightly cooler or warmer air on your face, depending on your preference. Leave it on neutral if you like. Just don't set the cabin on max cool and the centre vent on max warm (or vice versa) since the system will fight itself
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2007 X3 3.0si, 6 MT, Premium, White
Retired:
2008 535i, 6 MT, M Sport, Premium, Space Grey
2003 X5 3.0 Steptronic, Premium, Titanium Silver
2002 325xi 5 MT, Steel Grey
2004 Z4 3.0 Premium, Sport, SMG, Maldives Blue
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