Yet anothe A/C issue

Hello, all.

I have an '02 Town and Country, 3.3L, with manual A/C that is not working.
It is blowing warm air.

I have checked the compressor; it cycles on and off. I have checked the R134A charge, and it is adequate. I have checked and rechecked the controls, to see if there is a blend issue. None that I can find.

I have replaced the blower motor resistor three different times; I got an el cheapo the first two, and a good one on the third. fan is working like it should.

Does this thing have a module in the control panel that could be bad? I cannot locate a test procedure.

I'm stumped, and I have a very upset wife. Any help would be appreciated.

RIP posted a link in this thread that shows how to run a calibration procedure:

http://www.automotiveforums.com/vbulletin/showthread.php?t=1060200&highlight=calibration

Are any of the A/C lines going into the firewall cold? If so, then it's probably a calibration problem. If not, it's an A/C issue.