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I've done several R12 to R134A conversions and I always install a High Pressure Cut Out (HPCO) switch to prevent "blowouts" due to overpressure. Can't find them locally anymore so I bought the last two I needed from JC Whitney. With an HPCO I charge R134A to 85% of the R12 charge weight. OBTW, when you convert be sure you get a new accumulator that has desiccant compatible with R134A. Also, get an orifice tube (red/white) for R134A and adjust the compressor low side cycling switch for best performance. Check this link: http://www.forparts.com/techretrofit.htm
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