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Re: Recommended A/C Upgrade to Use R134a?
The poa valve is whats recalibrated. With the gauges on, if the low side only goes down to 30psi then its calibrated for r12. There are write-ups on recalibrating it for 134a. If you don't want try it yourself, I can recalibrate it for you. I do it all the time for the poa valves that I rebuild.
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