Sounds like you have two control lines not connected.
The fresh air and the heater valve
You will have to pull parts of the dash to hook them back up, but start at the control levers themselves.
the control panel is attached with a scew at each side, you may have the disconnect there.
The other ends are in the dash, but may be behind the center panel just above the shifter tower.
Search some on Samba for similar DIY's on dash removal for locations of the lines.