Originally Posted by ShakieHead
Its the mode 2 door. It broke and when they break, they fall and block the vents in the floor. It is the biggest PITA to replace and it will cost some money to have someone to do it. If you want to verify it, it's pretty easy to take dash out. Comes out and 5 pieces, would recommend a cordless drill. The mode 2 door is located behind the metal plate in the center of console floor above trans tunnel. If you can get the motor off, there is a gear and spin it. You can tell if the door is there or if the stops are in place. A company called Heater Treater makes aftermarket doors an also have videos. I would check them out, and watch there videos to help get a idea of what the location, and work involed in doing the replacement.
Most excellent post, ShakieHead! Thanks, and reps, for the input.