One side of 2015 VW passat gets cold air and the other side hot

Good day,

I have a 2015 VW Passat. TSI engine 1.8.

In the defrost duct on the instrument panel flap adjust motor is down in the
open position. This is causing frost on the outside of the windshield.

We opened the panel to see if we can some how mechanically close the flap.
Failed. Assembled the panel back. now I get hot…very hot Air on the drivers side & Defrost duct and cold air on the passenger side.
Please help
Thanks