Can you swap out the condensor from a 92 mustang with one from a 96 or newer mustang with minor mods? I am having some trouble with my AC after a 134a conversion and Ive hear that the weakest portion of this system is the older serpentine style condesor.
If you flushed & vaccumed the system down properly, problems will be at a minimum. I live in central Florida, and mine works pretty good as long as you aren't stuck in traffic. If the system isn't flushed, the old oil congeals and coats the condenser & evaporator, reducing the heat transfer. It only takes 2 cans of R134a, and the tendency is to overfill the system. See http://jrichker.stangnet.com/Mustang_tech/R134a_conversion/R134a_conversion.htm for R134a conversion help