2012 X5, I was going to post about the same issue, the climate control is really weird, it keeps blowing cool air in the center vents but it will blow hot air from the bottom area. When I try to adjust the direction (top/mid/bottom) it goes even wilder, but it still keeps interior warm. It feels like the center keeps the vehicle refreshed while the bottom heats it up so you can actually breathe better.. Who knows.. too many functions, easy to screw up. Luckily you can simply turn off the center vents to avoid cool air.