Mopar starship captain
I don't know about the first gen cars, but the second gen cars with ATC, you can press three buttons at the same time and the ATC panel will spit out the codes. If I remember correctly, you press the defroster and the floor heat and bi-level buttons at the same time. I only wish my blower were stuck on high as mine does nothing at all. I got an ambient temperature sensor code from the ATC panel, but apparently based on what I've seen on some of the other LH forums the blower motor resistor can go bad and be stuck on high. Or in my case, put out no air at all from the fan.