Chrysler Repair: 99 LHS Automatic Climate Control stuck in Manual mode, climate control unit, automatic climate control

Question
I have a 99 Chrysler LHS that has an Automatic Climate Control. The climate control is stuck in Manual mode. If its off and I push the Auto button, it turns on and displays Manual. This is actually better as the Auto doesn't work anyway. In the colder months, the heat only worked intermittently and if the temp setting is in High. Same for AC, but it needs the temp setting to be in Lo. Blower works fine. AC just died 2 days ago. Belt was replaced last year. I have taken it to 3 different places and they are all baffled. One place actually took some time and tried to reset the unit numerous times, but to no avail. Any ideas?

Answer
tell me what codes u get once u have this done

TROUBLE CODES FROM THE ATC CONTROL
The trouble codes can be checked with the ATC control if a DRBIII® scan tool is not available. The control head can only be placed into the diagnostic mode while the engine is running and the vehicle is not moving. Set the control to a 75° F setting (so there is no confusion with the 23-51 Diagnostic Trouble Codes (DTC's)

To place the system into it's diagnostic mode, press and hold the Floor, Mix and Defrost buttons (at the same time) The ATC head display will begin to blink. Release the Floor, Mix and Defrost buttons. Once the control head enters the diagnostic mode, the display on the control head will continue to blink. This occurs until it completes its tests and climate control unit door/actuator calibrations. Then it will display any diagnostic trouble codes that are present in the BCM. If there are no diagnostic trouble codes, the system will return to its normal operation as indicated by the temperature symbol (a C or a F) Diagnostic trouble codes related to the ATC and climate control unit will appear on the display in numerical form. The diagnostic trouble codes are stored in the BCM and can range between 23 and 51. The ATC control can only show one diagnostic trouble code at a time. Under certain circumstances, more than one diagnostic trouble code could be in the memory. To scroll through any additional diagnostic trouble codes, press the Panel Mode button on the ATC control. It is important that no other knob or button is pushed until all codes are read. Pushing any button except Panel Mode or turning a knob will end the diagnostic test without showing the rest of the trouble codes. There also may be other trouble codes stored in the BCM not related to the Climate Control System. These codes can only be found using the DRBIII® scan tool.