duel climate control out of center vents

[sinister135i]

After taking my 135 in thinking my duel climate control was broken.. aka the driver side and passanger side temps would not differentiate. The driverside knob would control both sides.
The service tech had to check two more 135's including a brand new one before he told me that the center vents share one vent and the driver side will always control it. so if your passanger wants to be warm,, (aka the girlfriend) than you have to close her center vents and make the air go to the floor and defog vents..
I still dont know if I trust the word of the dealer, anyone else notice this issue?

[Tom K.]

From what I've observed, that makes sense - the center vents respond only to the driver's setting. But what about the passenger side dash vent - is it independent of the center vent?

Tom

[sinister135i]

I dont think so, all the center vents get controlled by the driver side control..