Blower vents Dual Zone Climate question?

[Zcubed]

If you open the front vents then you will probably feel hot/cold air coming out pretty slowly. It doesnt just turn off every other vent and open a certain one, it just tries to direct as much of the air as possible in the direction that you want.

Ah ok so what you're saying is that there will always be some air coming out of the other vents?
I need to replace my air direction motor as it appears to be faulty. I can turn the drive wheel the motor would turn and I could not find 3 definitive positions for air to vents  but found that some also seemed to leak a bit elsewhere, which sounds similar to your explanation.
many thanks