A/C problem

[zakattack]

My A/C on my '94 SHO went out on me on my way home from work. It wasn't a gradual thing. It just started blowing warm air.
Now for the specifics. The a/c clutch engages, but does not disengage because it's trying to cool the car. I put the a/c on Max or automatic and the compressor clutch engages and the fans come. However, it just blows warm air. The compressor clutch will disengage if I turn the a/c off, or if I race the temp on the automatic controls. I'm thinking it's one of the switches, but I don't know which one. I'm thinking maybe the a/c cyclic switch on top of the accumulator/dryer near the firewall is stuck closed, but I'm at a loss. Wouldn't it still cool the car though? I haven't lost freon(R134a), because I had the system checked. Any insight into this problem is greatly appreciated. I'm at a loss
Also, the compressor will spin freely when the clutch is disengaged.
Thanks,
Chuck

 

[SHOZ123]

If the compressor is pumping and the line out is cool then the blend door would be the problem, my guess.

 

[zakattack]

If the compressor is pumping and the line out is cool then the blend door would be the problem, my guess.

That's what's funny is the line out is not cool to the touch like it should be. The a/c acted like it blew a fuse or something, but none of the fuses were blown. The loss wasn't a gradual thing. The loss of my a/c was sudden. I had it set at 65 and it was getting a bit too cool. So, I raised the temp to 71 and then nothing. It started blowing warm air after that. Craziest thing!
I just wanted to see whether I could fix it myself before I bring it to the dealer and get bent over.