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I have a 2006 commander 4.7 when I turn the knob for the air control from floor to vents to defrost I can hear the motor turn but get no air out of any of the positions? What is causing this to happen? Thank you for the help
 

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I recently had to fix similar problem on my 06 XK. The HVAC doors are controlled by electrical actuators about the size of a pack of cigarettes. I had two with problems. The driver side of the HVAC unit has two actuators. One just behind the ignition key and the other slightly forward and higher. I think the higher/forward one operates the defroster door. Some of these actuators use a small gear between the actuator and the door. The original gear is very weak and prone to breakage. Replacement gears have corrected that weak gear problem. I had to replace the actuator behind the key because the actuator had a broken internal gear (makes lots of clacking noise). I have not needed to do anything with the other actuator on the driver side so I am not sure if it uses the external gear or not. However, your description matches what happened to me on the passenger side air recirculation door which uses the external gear. If you do not have dual A/C controls, then your air blend door (controls ratio of hot/cold air) operated from a single door controlled by the actuator behind the key. If you have dual temperature controls, then you have a separate air blend door for passenger side that is on passenger side across for the one behind the key. The blend doors are direct drive from the actuators with no added external gear. The other actuator on the passenger side is up high on big air box just above the passengers right foot. That box is the air recirculate door to let you choose between inside/outside air. That actuator used the external gear and that external gear is one I had to replace recently. That recirculate door acted the same way as you described so I am betting that the defrost door has a broken external gear on the actuator. The actuator was operating but it did not move the door because the external gear was broken.
I know this was a long winded story to get to your situation but I thought it would help understand what you see when you open everything up. To open the driver side, remove the two screws that hold up the black panel under the dash. The panel under the steering wheel just pulls down and is hinged on a pin. Lower the door all the way down then bump the hinge area and the door will pop loose from the hinge pins. All the actuators are the same (I used Dorman 604-006) and the gear is part number 68072190AA. Actuators are held in by 2 or 3 T-15 Torx screws while the external gear just slides on. Hope this helps
 
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