Don't add R134a to an R12 system. They aren't compatible.
You can convert to R134a, add R12, or add an alternative refrigerant. An alternative refrigerant which works extremely well are hydrocarbon refrigerants. I use the Envirosafe product, http://autorefrigerants.com/co00033.htm. You don't have to do any conversions and it works well with the mineral oil used in R12 systems. It isn't legal to add to an R12 system, but I can tell you that it works excellant added on top of R12. Also check out Redtek, http://www.redtek.com/home.html.
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john
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