Just bought an '03 Cavalier LS this week. Everything was working perfectly fine. This afternoon however, air stopped coming from the center two vents above the stereo unit. Air only comes from the two outer vents. Air will also come from the defroster and the floor if I change to those settings. Any idea why the center two would just stop blowing? I can feel just a hint of cold air coming from them, but it hardly blows. And the two outer vents blow like mad. Any ideas?

No ideas? Surely someone has a direction to point me in.

Use the search function - I typed in "air vents" and got at least one full page - some look like they might apply.