Well you have 2 or 3 door actuators.They are little electric motors in your HVAC system that flip doors open and close and change air direction(defrost to midlevel to floor)and how mutch air flows across the heater core, if any at all.The issue is that the drivers side is not working.The question is why.Could be the little motors,or the heater control unit.You may also have a HVAC programmer.You can see what the parts look like by going to rockauto.com. and looking up your aplication,look under (heater blend door,heater AC control) I see that there are a lot of parts all tied to the heater control.I will just say that I had the same issue on a 2004 Chevy 2500HD with duel climate controls.Duel sliders to adjust temp.Do not know which you have,but dealer said that the actuater were at faul and wanted a lot to replace them.I ended up just replacing the heater control and that fixed the problem. I found mine for under $100.I don't think you will be able to find anything cheep on yours.Well good luck and I hope I have shed some light on this,and hope others can steer you in the rite direction.
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The handbook shows I have "Dual Automatic ComforTemp Climate Control" system. Also, the handbook says "...air flow sensors automatically adjust the airflow direction.....The system may direct cooler air to the side of the vehicle toward the sun." This is not my circumstance in variable direction driving now in the winter.
Does this have duel climate control?
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