Yes that was the bmw techn told me (you have always cool air inthe midle rear vents).
It seems strange. If you have it in auto at 20š (with the AC in off) you get in the midle vents cool, the upper and laterla inthe dashboard heat and the rear midle cool. And for mess every thing you get the stuppid red and blue dial. Itīs very difficult to get it balanced. In my old volovo you choose the temp anit was ok. By the way still get the whistle from the front vents. Have some one get it ficks it. Did they change the unit or made soma adjustamment in the flaps.