when I got my green Jeep, it had A/C minus the condenser. I got a used condenser off of ebay, installed it, vacuumed the system down, put R134 fittings on the sanden compressor, and charged it with R134 (using a set of R134 gauges). It's worked great since around 2003. The CJ systems had flanged fittings so there are no orings to deteriorate, and while I've heard that the "black death" is possible doing what I did, my system had been open for no telling how long given that the condensor was gone and the hoses from compressor to condensor were missing, so I figured I had nothing to lose. Worked for me. Do it at your own risk.
85 CJ7 258, borla header, Team Rush, MC2100 ,optima batt, Warn 8274, agr super box 2 & pump, T5 w/ B&M shifter, centerforce 2, superior 1 piece axles, warn hubs 2.5 in lift, 31" BFG MT
85 CJ7 258, A/C, T176, MC2100, Team Rush, Warn XD8000i, superwinch hubs, 3in lift 31" BFG AT/KO