A/C blows warm air

After layoff for two months, A/C blows warm. No "check engine light" blower motor fine, fuses, replaced relays anyway. Under hood, noticed A/C clutch spins, (I do know the electric fan does cycle on in traffic) added Freon that came with gauge, read full before I pulled trigger. Days later purchased Manifold gauge from Harbor Tools to get a pressure reading. Read even 60 high and 60 low while the A/C clutch was spinning. Ran out of time, so disconnected high side and low side.I will mention that the high side shrader valve did leak when I disconnected the hose from the manifold gauge like it is stuck open, put dust cover back. Replace valve? Later, wanted a second pressure test for diagnostics, now the A/C clutch will not turn because too low? The readings were 20/20. I do not have much money to spend on this so trying to go slow and careful.