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Your system has 2 "blend doors". They blend the hot/cold air for the right temperature. For whatever reason, one of your blend doors is not operating properly. Two likely possibilities: 1. The hinge on the blend door is broken so the door can't move

2. The actuator that powers the door is shot

3. (least likely) Your control unit (or wiring) is faulty. A dealer repair on this may be spendy. To get to the blend door they need to drop the steering column and remove the entire dash.

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Q: MY 2003 Dodge Ram with dual zone climate blows cold on one side but not the other?
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