J.B. Hebert,

"Is there another way to purge the air?"

This is ONLY for historical perspective; but in the "old" days, you would just loosen the hose at the gauge and run a tiny bit of refrigerant thru for a second, to purge air. Patently illegal, now, but common and efficient in the past.

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The Golden Rule

1984 300SD (bought new, sold it in 1988, bought it back 13 yrs. later)