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Q: air blows,a/c & heat, why doesn't the mode work, only blows feet and defroster on 2004 Chevrolet Tahoe

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Always blows defroster and feet no matter what the setting
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Mode door or motor that changes the door position may have failed. This problem can be diagnosed with a Tech 2 GM scanner. A few other scanners may be able to do it also but the higher end scanners are needed.
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