If the system held a vacuum and is fully charged, the compressor is likely no good. If you are showing 45 PSI (equalized pressure with the system off for at least 1 hour) and there is no change when the compressor is running, the compressor isn't working. The only other thing I can think of other than a bad compressor is if even though the compressor clutch engages, for some reason it isn't turning the compressor. Do you notice the center of the clutch/pulley assembly turning when it engages?
Also, here is a link you may find of interest:
Watch to see if you see the center of the clutch/pulley turning when engaged and stopping when it disengages.
Let me know.
Monday, June 14th, 2021 AT 9:38 PM