I'm not familiar with the Ford, but back in '94 I removed the A/C from one 1990 Chevy pickup, and installed it an another. I began at 09:00 and it blew cold before supper. That includes almost an hour's travel time. I'm no mechanic or HVAC Tech, just an electrician who dabbles in interesting stuff.
The "donor" truck was wrecked, so I could take all the parts I needed. The serpentine belt ran around an idler pulley on the truck w/o A/C. If I remember right, the belt was the same, but took a slightly different route. When I mounted the compressor, it replaced the pulley. The firewall had dimples where the accumulator(?) mounted, and I simply measured the factory-A/C truck for the rest. Poked a hole in the firewall for a hose from the condensate drain. The plastic ductwork was made for the A/C evaporator coil in both trucks. Probably cheaper than making it different. Getting the plastic duct apart was the most difficult part. The bottom of the duct over the passenger's feet has a removeable bottom.
For controls, I went with a rocker switch on a vacant dash panel, and wired it in series with the low pressure switch. This switched the clutch for the compressor. Fan speed was controlled via the existing switch - truck didn't know or care if it was blowing hot ot cold.
We have "real" A/C guys at work who weren't sure how successful I'd be. I didn't pump it down, and charged it with a few cans of the now-outlawed R12. In 2000, when my new Silverado came in, the '90 was still blowing cold. The truck had 215,000 miles on it and ran like a champ for another 60,000. At that point, one cylinder showed poor compression, but the A/C still worked.....................chim
