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I'm not Beav, and I hope he answers, but first - you did replace the drier too didn't you. And if you lost any oil, you replaced that, yes?
I don't know that I'd pressurize with air. And how were you going to do that? I think it may be illegal if you later vent, but you could put in some 134 and let a gauge sit while you watched.
But why not get just get it evacuated? The tech will see if it holds a vacumn anyway before recharge.
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