"I have a dry nitrogen cylinder I hook up to my gauges & pressure test the system as well. My truck will hold pressure a lot longer than it will hold vacuum."
That is a great procedure.... have seen it suggested several times on places like aircondition.com forum....
Many ( particularly old) seals,orings,gaskets will leak when tested in the direction opposite to what they are used at.... ie, under pressure normally... under vacuum in test...
And the dry nitrogen is recommended as a flush anyway.... and no R12 is at risk in your test...
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