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2004 Xterra XE 4WD Auto 3.3L NA V6
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Those are some of the plastic gears that the heating and air conditioning system uses. One or more of them has failed (most likely stripped out) and it can't fully move its door. It looks like it's pretty easy to get to, but I don't know how easy it is to repair/replace the parts, nor how available they are now that the most recent Xterra model is a 2015 and that is now about 8 model years ago.

What you can do is download the free FSMs for your rig and see what they have to say about inspecting, trouble-shooting, and resolving any issue.

Nissan Service Manuals - NICOclub
 
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