Re: AC Vent moving on its own
Ok, so I finally got around to taking a peek at the vents. Removed center bezel to gain access to the rear of the vents. Upon inspecting, there are 4 small "cams" on both top and bottom. On the top, there are tabs which can be pryed up in the event you need to remove the "vane assembly" from the vent itself. I couldn't find anything out of the ordinary so I decided to make a very small plastic shim to insert into the tab to create just a bit more downward pressure on the vanes.
Still unsure if it was possibly a manufacturer defect, or premature wear, but either way, the shim fixed it. Liked it so much, I shimmed the opposite vent as well. It definately won't move unless you physically move it (or drive through a F4 tornado with the windows down). Contemplating removing the vanes and using a heatgun to mold the tabs in question downward a bit so no shim will be necessary.
I did not take any pictures, but can snag a few if need be. Once you get the center bezel removed from the dash (quick pull at the bottom), the vents are pretty self explanatory in how they move.