98 Malibu ac problems

My girlfriend has a 98 malibu and she is having problems with her ac. I checked the fuse, tested the relay, checked the r134 pressure, and I can visually see that the clutch is engaging. Yet with all those things working right her ac is still terrible. Any idea's I know I am out of them.

TIA

It might need freon or that whole AC/heater selection thing-y might be bad.