What can-tap are you using?
US EPA regulations changed the thread-on "Pounder" refrigerant cans (typically 12 oz net weight) so that thread-on can taps for the older cans won't work on the "Self-Sealing" newer cans. I got caught on that when I was working on the Trailblazer A/C. Had to order a new can-tap from Amazon.
But of course there's many suppliers of essentially the same thing.
If you're not using the "one-pound" "Pounder" cans, or you're not using thread-on can taps, I don't know what's going on. Do your AC manifold gauge hoses have in-line shutoff valves? Mine do. Did you open those valves?
US EPA regulations changed the thread-on "Pounder" refrigerant cans (typically 12 oz net weight) so that thread-on can taps for the older cans won't work on the "Self-Sealing" newer cans. I got caught on that when I was working on the Trailblazer A/C. Had to order a new can-tap from Amazon.
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But of course there's many suppliers of essentially the same thing.
If you're not using the "one-pound" "Pounder" cans, or you're not using thread-on can taps, I don't know what's going on. Do your AC manifold gauge hoses have in-line shutoff valves? Mine do. Did you open those valves?
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