Chrysler Repair: 97 Concorde: suddenly no heat, 1997 chrysler concorde, air distribution system

Question
I have a 1997 Chrysler Concorde LS with automatic temperature control that has been sitting since last fall due to what turned out to be an ignition switch failue resulting on no power to the HVAC controls, no power windows and the air bag light on.  Replaced the ignition switch and all of these issues are gone.  Let the car warm up and since it is winter here in New England had the defroster on high and it was blowing nice hot air like a champ.  Drove the car about 4 miles down the road to the gas station at which point it was getting so hot in the car I turned the thermostat down.  Since then I have no heat at all.  Just ice cold air.  Any suggestions?  Thank you!

Answer
Hi Ryan,
Fortunately the unit does have a self-diagnostic capability. The engine has to be running and the car not in motion to do the test. Simultaneously press the floor, mix, and defrost buttons, (the 1st,2nd and 4th on the top row) and see if the display unit begins to blink. Release the buttons when it has started to do that and then after it blinks for a while longer watch for two digit numbers to appear on the readout. Those are the fault codes. If the first number appears and stays in place, push on the first button in the bottom row (panel) to continue the readout. At the end of the readout the unit will return to normal settings.
Then write back with the number(s) and also tell me more about exactly what is wrong with the function of the unit.*
It may be a part in the air distribution system itself rather than the computer that is the problem. And you also might find a small part at a wrecking yard.
Roland
*The code numbers range from 23-36. You can also get a decoder list at www.allpar.com/fix/codes_climate.html
PS Sorry for the delay but I just found your question in the 'pool' to which it had been referred by Kevin. Please 'rate' my answer, and where you see the question about a nomination to be 'volunteer of the month' consider giving a 'yes' answer. Thank you