defrost wont kick over in the front

[silvey19k]

im not sure if vaccume is the issue or what but the door wont move and im not sure what it is that nis wrong. so chime in and please help me if you have had this problem befor.

[SteveJ]

Have you looked through the diagnostics in the FSM? I'd be surprised if it's not covered.

[silvey19k]

the only thing found was a sticky door not sure if one of the dash pots go to it and if its bad im 2000 miles away from the car and fsm so i need some hepl from the smart people here i know someone has had to of had this problem

[Willoughby Z]

Vacuum leak - very likely in the small tubing on or near the mag valves, vacuum canister (aka 'football'). Cuts in the tubing between canister and the mag valves and, and ultimately, to the selector switch/valve (behind center dash) would mean no control of doors (floor/defrost/dash) or mode (heat/ac/vent). And easier to find, being under the hood, rather than inside the dash . Default is air flow from center vents. Unless there was a mechanical failure (diaphragm valve/return spring, etc.), my bet is a cut or split in the tubing. Every one that I have found is near the end of a tube where it slips over a pipette or a 'T'.