Make: GM R4 setup
Refrigerant Type: 134a
Ok here is a strange question....more on the theory of operation i guess. When you lose only a little refrigerant will air and moisture replace that volume when it bleeds out or will that not be a concern since it is under lots of pressure and only happen when the pressure gets very low? My concern being that i have ester oil in there now.
The reason i ask is that (stupid me) i instinctively removed the valve core for the cycling switch on the accumulator when i removed the one from the low side port to put on the conversion fitting. With my luck, now the cycling switch took a crap and i figured no problem, just unscrew it and screw the new one on....haha, nope! I realized this last fall but then the car went into storage. Just pulling it out recently i did a quick test and i am not down much as it blew into the 50's fairly quick (didn't get a chance to put the gauges on). With ester oil liking moisture, should i worry about that or just drain, new valvecore and switch and vacuum and re-charge?
What are your opinions?
Do not worry about it when it's only open for a couple of minutes to replace a part.
If you want to be really fastidious about it, recover to EPA specs (4 inches vacuum or better) then break the vacuum with nitrogen (up to zero pressure) and keep the nitrogen flowing in slowly to keep air from moving in until you have the valve core in place.
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