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No, if you mix them they will gel and ruin the compressor and other components. Also, the oil that is used in the r12 system is not compatable with r134a and will not flow thru the system properly causing the clutch on the compressor to not disengage. If you decide to retro fit your vehicle your need to replace compressor, orfice tube, condensor, the fittings and the evaporator, so pretty much all the components and the system need to be evacuated and vacuumed so there will not be any moisture or air in the system.