Possible Causes
WARNING: This page is about a different car, the 2003 Dodge Dakota. However, it is still accessible from the selected car via links, so may be relevant.
EVAPORATOR TEMPERATURE SENSOR
EVAPORATOR TEMPERATURE SENSOR SIGNAL CIRCUIT SHORTED TO GROUND
EVAPORATOR TEMPERATURE SENSOR SIGNAL CIRCUIT SHORTED TO SENSOR GROUND CIRCUIT
A/C - HEATER CONTROL MODULE