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Good morning and welcome to JustAnswer!!My name is ***** ***** I have worked for a Chrysler-Dodge-Jeep dealership for 18 years and I will do my best to help.
It sounds like you have a bad blend door actuator or broke blend door itself.. I attached the directions to remove the blend door actuator.. You will want to watch it to see if it's moving when you adjust the temperature if not replace the actuator, if yes then remove the actuator and if you can spin the door all the way around the door is broke and the dash will need to come out to replace it..
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