I have a question for the people who know Air Conditioning. I found a kit to convert the old R12 systems to 134-A type refrigerant. When I had my Bronco II converted the man said he had to change the condenser and all the seals. ($256.00) You can do it that way but its not the best in the world. Ideally the system should be flushed, dryer changed and all new o-rings. Hoses can also be replaced but they don't leak as much as was initially thought because the oil seals them up. If your system is only a little low you will be much happier just having the system topped off with R12. Steve B.