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With older vehicles this was easy, because it just meant that a cable needed to be adjusted. However in newer vehicles even with manual controls the parts are often motorized now. Best option, take to a dealer so they can fix the control valve. It's moved by a small servo type system that can sometimes become jammed. (Debris/breakage as it's plastic etc.) GM has used this system for air flow direction control for over twenty years now.

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16y ago

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