Dodge Repair Questions? Ask a Mechanic for Answers ASAP
Hi. Generally this is caused by the mode door actuator. It is located on the drivers side of the heater box. You can look at the actuator and work the mode door and see if the motor is moving. Let me know if you have more questions.
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You should install it back into the car and see if it turns. You could have a blown fuse, an hvac module concern, or the door in the heater box can be broken. You could try turning the door by hand and see if the mode switches. Also the actuator does not just relay on power and ground, there are feedback circuits to tell the hvac module its position. If one of those circuits are not working the actuator may not move as well.
Almost all the time it is the actuator. When you narrow it down like this it is helpful to have a scan tool that can check codes in the hvac module. It would still be worth checking all the fuses if you have not.