Up until the compressor kicked in, it sounds like the evaporator fan has an issue or there are loose screws. Press around in those areas and see if the noise goes away. If so then there is the problem area.
No scale, just used the recovery line in the middle. Did not do much as I was not sure if I was doing it right.
I'll be going to the house tomorrow and try it again but my other concern is that the technician that came with his digital gauges showed up to have about a 5 super heat reading. I did the testing myself right after he left and my super heat shows 0 or 1 super heat.
After refrigerant is removed, it may take a few minutes for the unit to stabilize and the tech needs to stick around.
I sure as hell hope you had a recover tank connected to the yellow hose and didn't vent - it's against the law to vent refrigerant and even if it wasn't, still wrong.
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