I'm in the weeds trying to diagnose AC problems. My AC worked all last summer. The engine was rebuilt over this past winter (refrigerant evacuated as well). I tried to charge it myself (which I did correctly) but it wouldn't take any refrigerant. Low side and high side both quickly went to about 70 psi and stayed there. Then, I had my friend charge it, engine off, with one of those machines. He added the exact required amount of refrigerant, but it still blows warm air. In both scenarios, the compressor and radiator fan kick on and are running when the AC is turned on, but no cold air. There are no leaks, everything is connected, fuses are good. Any ideas?