R4 is the style of radial compressor. R12 is the type of refrigerant used in the older systems also known as Freon.
I'm with leathermang on this. Have someone else do the work.
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“Whatever story you're telling, it will be more interesting if, at the end you add, "and then everything burst into flames.”
― Brian P. Cleary, You Oughta Know By Now
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