2001 Eclipse A/C

I have a 2001 Eclipse RS with a 2.4L 4cyl engine with 47,000 miles. I drove the car to work and the A/C worked fine. One day when I got out of work, I got in the car to find that the A/C no longer blows cold. I checked the refrigerant pressure and the pressure on the low pressure hose is in the correct range, but I can't figure out why it stopped working so fast. I checked the fuses which were all ok, and everything else seems to be working fine. The fan is coming on when I turn on the A/C. When I turn on the A/C and set it to the coldest setting, and turn the knob even the slightest click towards heat, it starts blowing HOT air, and obviously the more I turn it clockwise, the hotter the air gets. Is there anything I missed? I didn't think it was a leak because of how it stopped working in an 8 hour period. Any help would be appreciated.

Just as a side note, I just got done tearing out the console and cleaned the evaporator (which was filthy) with an old toothbrush.

As far as the A/C clutch, it never squeeled. I tried to see if the clutch was working, but I guess it's internal because even when the A/C is on or off the pully turns the same, so I cant really tell if it's coming on or not.