1994 Chevy S-10 condensor

how to tell if condensor is clogged and how to tell if compressor is on its way out. Compressor still works I think pretty good but cant get vent temps as cold as before about 50 when outside its about 85 befir it was in the fourtys late afternoon 100 plus outside vent temps are about 60 spray a little water on the condensor and the temps come down 6 t0 8 degrees somethings wrong . I have changed the accumulater and orifice tube and vacuumed and recharged the system to get this good. Help!!!!