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Tom:
Nitrogen is not available to the home mechanic who wants to get his AC system fixed on a Saturday afternoon with the minimum amount of trouble.
I only have compressed air on the system for less than five minutes because that's usually all it takes to find a leak. My compressor has a water separator on it. The air is static in the system, not flowing. With the little quantity of air that it takes to fill an AC system at 40 psi and the little time involved, there is no way that the dessicant in the filter-dryer will become saturated or that any residual moisture will be left in the system after evacuating it for 30 minutes to an hour. Considering that an open system in Houston will naturally pick up some humidity while you're working on it anyway, I doubt that introduction of air onto the system for a few minutes to check leaks is a problem.
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