ATC problem on '94 LHS

I have a problem with my A/C on a 1994 Chrysler LHS. Randomly the blower motor will turn on and blow out heat through the dash board. Pushing buttons will not do anything unless I unscrew the ATC and kind of squeeze the module and press buttons at the same time. At first I though it would be a faulty ATC however, when I remove the ATC and the A/C fuse the blower will still turn on to high heat. Of course I can remove the blower motor fuse and it stops but then I have no A/C. It's HOT! here in Arizona. I ran the self diagnostic on the ATC and it came back with an error 31 which says it's an "ATC recirculation Door Stall Failure"...What exactly does that mean?
Thanks in advance,