Converting to R134a is a lot more than putting some fittings on and charging it. R12 uses mineral oil, which r134a doesnt transport very well, its not compatible. You have to get that old oil out before you can add new oil and refrigerant, and to do that you need to take your whole ac apart and flush everything out properly. Its a pretty big job. I reccomend you stick with r12. I did the whole conversion, put it tons of work and im not happy with it, i would have rather stuck with r12, its what the system was designed for.
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