aerostar-ac/heat

I have a 1994 Ford aerostar. I bought it used in the winter. The AC works, but no matter where I put the selector switch, the air comes from the defroster vents by the windsheild and the heater vents by the floor. It has
to be in the switch or there is a door in the ducting that directs the air through one set of ducts or another. I am used to working on old GM trucks and every time I think to try to figure out how to figure out How just to get started I give up. I just need a starting point. The fan switch asembly is in the middle of the dash and there doesn't seem to be any access. I believe that un older Chevys the door that controls the airflow in the ducting was controlled pnuematically.
The cruise control doesn't work and if I remember correctly it was controlled by pnuematically as well. (on a Chevy). So I guess that the relays that control both could be on the same fuse. I don't even know where to find the fuse box.
I'm getting old and poor and the summer is coming on strong. I live in ABQ, NM and it gets really hot here. I don't drive very much, but I do drive and I would like very much to have my AC.
Thank you,
james
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Your 94 Aerostar is similar to my 93 explorer (uses same shop manual) The heater duct is operated via a cable (like a bicycle gear shift cable). It may have come off the lever or the duct door. DO you feel resistance and hear flaps operating when you move it. No need to run the car to pump up pneumatics, it is not.
You probably need to remove the main bezel of the dashboard to expose the screws for the heater controls. I picked up a control panel in a pick and pull last year for only $20. I needed the fan switch. These tend to burn out the contacts so keep it as a spare if you get a new part. When the fan switch fails, it will either stay on full or off but nothing in between.
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Yeah but. . . My dashboard isn't obviously something that can be gotted in to. There are screws along a plate that houses the defroster vents. maybe I could strart there, but there's still no guarantee that that would get me in the dash. Next thing you know, I have the whole dash and all the components, and. . .
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I'm sure if I could get in the dash, I would eventually find what the problem is. I had an '89 F150 Something similar happened to it. I was able to hook something to the lever that operated the door, and just change it seasonally. I guess I'll have to look closer

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I looked at the shop manual and the temp knob is cable operated but the selector switch is pneumatic. Good news is that the rear control looks interchangeable but the bad news is it looks like you need to remove the whole dash to get behind it not just a bezel. It starts with the panel below the steering wheel and the support behind it then there are several bolts and a few more nuts to undo before the whole instrument panel comes out. Looks like a big job. Maybe you can reach inside from behind the glove box or by removing the ash tray.

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