[richtazz]

Check the two access ports to see if the car has already been converted. If they are threaded fittings, it's still R-12, if they have quick connect type fittings (similar to those used on a garage air compressor) then it's already been converted. You can buy a conversion kit (make sure you get one with a guage) and do it yourself. It's best to take the car to a shop and have the system evacuated of all residual R-12 (don't release it into the atmosphere) and vacuumed down to negative pressure to make the car accept the new refrigerant much better. I've done quite a few cars with these kits, and had good success.