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what the best book on car AC that best applies to going from R12 to R134 - there are bits and pieces explained in many posts. When I dive into this I want to have a good list and process for evacuating and charging properly. I like the idea of getting a vacuum pump and DIY. I have an 89 coupe and planning to completely redo the ac system this summer. So I need to decide on model of new compressor, hose kit or DIY hoses, 3 way valve, ProCooler or no ProCooler/etc. Right now I'm leaning toward keeping the same evaporator and condensor assuming there are no leaks.
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