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Not sure about the Argon / Co2 mix, but nitrogen is perfectly fine to use. Nitrogen has no moisture, so it won't contaminate the system. Many A/C shops use this method. But whichever you do use, vacuum it down, and check that way too. I've seen leaks not show up under pressure, but will leak under vacuum.
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Brent
Early85 944
LM6Y Paint Code
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