This has been happening since we picked up the X a year ago...When we set the climate control on auto, we get no heat from the center dash vents. Even if we set the temperature dial to the 3 red dots. However, when we press the manual vent contol, we get warm/hot air. Anyone have an idea what it could be? Our M's climate control is the same and is functions just fine with warm air coming out of the dash vents on the auto setting. Any ideas appreciated. Thanks!

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'03 Carbon Black M5
'04 Silver X5 4.4
'04 MB SL500