I have a 1987 560 sl and I am about to change my ac compressor and drier. I already installed the new expansion valve. I want to convert it from R12 to R134. What does it take to convert the system over to the newer refrigerant? I have the rebuilt compressor and new drier waiting to go in.

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Jim
1987 560 SL "The Beast"
1999 Jeep Cherokee Sport
2003 Nissan Altima