With A/C on and blowing out vents, the driver side is cold but the passenger side is putting out hot air. There is blend door actuator for each side and the right side can be accessed by removing the glove compartment and the panel behind the glove compartment. You may expect to see the blend door actuator is bad but usually the actuator is good and has a broken gear. The gear is how the actuator is able to move the blend door. The gear is available as a stand alone part. The gear broke for a reason. Usually the reason is that the blend door is stuck. The actuator tries to move the stuck door and the plastic gear breaks. You can try to free the door by using the broke gear and turning by had. Sometimes it will come loose, but replacing the gear only is likely to have the same problem as soon as the door sticks again. The fix is to replace the air distribution housing which houses the door. A seal deteriorates in the old housing and sticks the door. New housing assembled with new parts. The problem is the replacement involves removing the instrument panel to access the housing. I've noticed some creative "fixes" online to avoid having to actually do the repair and while it is understandable to try, it isn't a proper repair. Most just postpone the same problem or don't allow the door to operate in it's full temperature range and they all require the door to free up before attempting.
The part you'll need (19) 2011-2013 Mopar 68079501AB
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