F10 facelift - inner air circulation is not working

The inner air circulation in manual mode is not working (AC is set off) in my F10 (BMW 520i) facelift model. I sent it back to the BMW service to repair this problem. They tried to fix it, but it’s still the same, it’s not working. Service said that this feature is not working at BMW 5ers and my nose is too sensitive :), and it's normal that BMW 5 series’s inner air circulation can’t be switched on properly, it will let slight outside air in all time (in manual mode). I also tested other facelift F10 models and experienced the same problem.



BUT: I tested a 2012 F10 BMW (model before the facelift) and the manual inner air circulation did work! So there’s a problem only with the facelift models.


Any suggestions what to do, because service doesn't care with this issue any more?

Thank you

F10 facelift - inner air circulation is not working