The AC works in every position except off, floor only, and dash vent only.
The door that is vacuum operated in the pass side foot well is the recirc door for the MAX AC setting.
The blend door lives inside the heat3er box and you cannot see it. If you remove the glove box you can see the actuator.
This about the only picture I found to help show what your looking at, the dash has been pulled and is resting on the seats.