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I have a 2010 2500 diesel. Sometimes my windshield defroster will not work when I put the control in that position. It switches between the dash and floor just fine. I have heard a noise from somewhere near the floor maybe below the center of the dash. It sounds like something might be stuck and there is a noise like an actuator trying to operate something. If I turn the key off it quits. Right now it's working again. Any ideas? :banghead:
 

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It's one of the blend door actuators, $18 and 3 screws and your done. I had to replace all of them in my 2010, a 90º phillips comes in handy for the tight spots. Check the one on the passenger side just to the left of the lower glove box, you will see it move as the clicking sound takes place. There was also a recall for the control head not working properly.
 
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