Anytime you have the system open you have to have it evacuated afterwards to get any moisture out and in my case the condenser had to be changed as there is 30% chance that the oil in the system will slug it..

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"When the Team Chief said.... You're trapped in a hole with nothing but a goat and a slinky, what do you do? Stubby said, I'm not sure but it won't end well for the goat...." ~(Overheard) Last day, Phase 3, Q Course