2000 Chevrolet Cavalier air conditioner

I have a 2000 cavalier. I recently charged the system, manually myself, and had success the first day. The next day, however, it started blowing hotter. I rechecked the level and it was ok, but now it still will not blow cold and the compressor clutch is rattling very badly. Could it be possible where the system hasn't been charged for many years, when the clutch or compressor did kick on it destroyed the clutch, or do you think that I could oil it manually? If nothing else could I unplug it and stop the noise?