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

Always blows defroster and feet no matter what the setting

Asked by for the 2004 Chevrolet Tahoe
POSS BLEND DOOR STUCK OR BROKEN SEEK DIAG AND EST
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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.
Not just a OBD2 code reader.