[70TWO NOVA]

Ok, so I just finished installing the gen 5 vintage air system into my Dads 1980 Camaro and when I turned everything on for the first time I was only getting air out the floor and defrost vents. When I switch to "dash" it stays on floor/defrost. No matter what I do with controls it will not change to dash vents. I read through the troubleshooting and made sure the system was mounted properly as to not bind the box and thus the blend doors. Still nothing. I rechecked all my wiring and even the stepper motors that control the blend doors and coudnt find anything wrong our out of place. Is there something I'm missing? Something else I should check? Any help is greatly appreciated