WHOA!! If you just bought these cans, like in a store, they are not R12, they are 134A. Do not mix R12 and R134A. If you are unsure about what you're doing, stop. You could easily kill yourself. R12 is only available with a 609 certificate. Mixing types can lead to compressor failure or worse.

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1985 300D 197K - Semi-Daily Driver Diesel
1998 Volvo V70 AWD 226K - Daily Driver 2
1998 Volvo S70 140K - Wife's DD
2003 GMC Sonoma ZR2 Option - Rusty Truck
THE BABY 1958 220S Sedan 66K All original, never restored and never will be.