radio shack for the fan and position and designed a servo controller and installed a servo to operate the blend door. The fan position was easy 1 pole for each speed, wired to a relay.
The position was another issue. I found a electric ported vacuum switch by searching here. it was used in some lat s-10 blazers with auto-HVAC. its basically 1 vacuum line a 5 or 6 (can't remember) solenoids that trip individually. i ran these to each of the vacuum diaphragms to work to mode doors (floor, vent/dash, defrost etc.) then using a combination of diodes and switch positions i managed after ALOT of trial and error to get the following positions; off, dash, dash/floor, floor, floor/defrost and finally defrost.
I DO have pictures of this but i did not document the wiring or vacuum schematics i will try and post them later if i get a chance.
the only thing i haven't figured out yet is the a/c switch and the heater valve. the a/c shouldn't be too hard. but the heater control valve requires vacuum to shut it off, thus rerouting the coolant back to the motor, this lets the a/c work more efficiently. It normally shuts when the hot/cold lever is all the way to cold. i may have to install a push button for this.