Getting deep and heavy - I like it. I feel confident that I can't get better advice and quality knowhow on AC anywhere else.

Question - I know there must be a good answer to this but I'm curious - why can't one pressure test with just plain air instead of nitrogen? I understand you don't want to introduce moisture - but if the system is empty/open and you are going to replace the receiver drier and vacuum soon after - is there some really clear reason one can't use compressed air? I've seen youtube videos of this - but of course the comments are just a bunch of people screaming at each other.

Where does one regular joe like me get nitrogen, is it expensive?

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Andrew
Montclair, NJ
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1982 300D Turbo
120k
Petrol Blue Green