It's about water too
I think pulling a vacuum of an a/c system is two fold, one to purge the air in the system and the other is to remove the water vapor from system. When you pull a vacuum it cause any water in the system to "boil off".
I know nitrogen is used by telephone companies to remove moisture from phone lines in that it displaces water. So I'm not sure if it would have the same impact on an a/c system
I bought a little device that hooks up to an air compressor for about $40 that pulls a vacuum from an a/c system. It works great as the 2 cars I have used it on are still working with converted r134 systems.
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84 944na guards red...nothing more, nothing less
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