I would recommend checking the high cap (idk if that's the official name of it). Basically, the cap all the way to the left in the engine compartment that you use when adding coolant.
Crank the car, turn the AC on full, then check to see if any coolant is leaking out of that area. There is a stem in it that can sometimes come loose or allow it to leak--this was the case with mine AFTER I had the air compressor replaced because it too did not work.
It's a quick fix if that's the problem, hopefully it's not your compressor. Good luck!