Originally Posted by Messer-schmitt
My dealer (Brett from BMW Autohaus, St. Louis, MO) told me, and I quote: "This car is designed to do 150+ on the Autobahn. After driving for a while at that speed, if you want fresh air at that speed, you don't roll down the windows, it would be too painful. So what you do turn this wheel to the hotter or cooler sides to get that temperature of fresh air in the cabin".
Love me some German engineering!
I bought mine from Autohaus in STL as well
My CA's name is Don though. Really great place. Their new facility is awesome.