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No Matter what switch is set at, air only blows out the panel vents. How do I trouble shoot this, I live in Alaska and must have my defroster. All fuses are good, Temp selector good, Fan switch good, blower motor good.


   
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Location: Oregon
first thing you should do is have your hvac system scanned for codes. Your mode door motor may have a problem, or the control panel is not sending a signal.
#6 is the mode motor
#8 is the floor motor
#10 is the defrost motor


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