My wifes car air condition system had to have R-12 because it was 90 Toyota Corolla. I went to the Advance Auto and bought the change out kit which you depose of the R-12 and install the new type 134a. The name of the kit is EZ-CHILL. It has the freon,oil and conditioner for the seals. The air is as cold as it was before. But we are letting the little car go and picking up a 03 Jeep Grand Cherokee this coming Monday so I'm happy for the wife. It'll be her vehicle.
EZ Chill R-134a Recharging & Retrofit Kit with High Mileage Refrigerant
RKR-7
Complete kit to retrofit (convert) an R-12 A/C system to R-134a or to recharge an existing R-134a system. No tools needed. Refrigerant contains anitwear additives for high mileage vehicles and system-safe leak sealer.