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My A/C doesn't work on my 91. The on switch does illuminate on the controls but the compressor doesn't engage. According to the last owner it was charged but had no affect. I'm suspecting electrical issues and need to know which switches to start checking for, as well as locations of said switches. I will use this truck to commute about 8 hours on the weekend for a while and could really use it on long trips.
I ran into this also on my 91. The issue for me was the shoes had actually bonded themselves to the drum. I tried backing the adjuster all the way in and pulling the wheel cylinder bleeder out; none of these worked. Worse, as I tried to force it off the shoes both bolt holes in the drum stripped, giving me no means of leverage. My final solution was to disconnect the parking brake cable at the adjuster and all mount screws for the cable, remove the brake line going into the wheel cylinder, unbolt the four nuts at the back of the backing plate (the axle mounting nuts) and pull the drum and axle out as an assembly. I drilled another hole and used a self-tapping screw (about the same size as needed for the factory holes) and the drum came right off.