I think that may be it, while driving there was a few second delay when I turned off the recirc, so I looked while not driving and there it was, as soon as the door moves in place to take outside air it starts clicking. It does move the panel all he way over but it appears it wants to keep on moving...

I Played around a bit and if I turn on the recirc the tapping stops, and If I turn the air off and the recirc off thye tapping starts again. So for right now that is my only fix is to turn on recirc to stop the tapping, I hope someone out there has more

Mine just started this today but it makes the noise with air off also, I see the pad above the cabing filter tapping (in rhythm with the blinking seat belt off light) so it appears to be electrical. Any suggestions out there?