The AC worked great on my 1991 Ford pickup for years until one day it didn't. I downloaded a parts diagram for the system so I could find all of the O-rings and check them. I replaced the factory crimped hoses and bought a compressor kit. Converted from R12 to R134 at the same time. Have not had to add refrigerant since, about two years. May go back to R12, probably not, works great. Spent around $250 or so.

I am due for a road trip. I collected a set of road maps that predate the Interstate System. It would be fun to take what is left of the old roads. Have fun.