Seems to be a Lot of AC questions right now! I put in a new AC system in my 80 Z recently and am trying to figure the inside of the car stuff now. I got the system from original air and it’s like the factory set up. Couple issues I’m sure y’all can help me with. 1. The connection between the upper air distributor and the lower air duct is not even close to fitting. From what I can find on the net it looks like there’s a gasket (pic) that goes around the lower. Is this enough to seal it off? 2. The blend door? Doesn’t move. I assume the temperature slider on the control panel opens and shuts this? I see there’s a cable from the control panel to the door, maybe it broke? I assume this is why there's always heat coming out unless I turn the ac on? 3 I assume there’s some vacuum control in the system too. Where’s this come into play?