My A/C venting systems CLICKS like someone knocking on a door. on 2005 Nissan Titan

I think it's a valve gate on the ac vent trying to open but slipping, any idears? It's intermittent also.

by in Key Largo, FL on October 17, 2012
1 answer
ANSWER by on October 17, 2012
yes you have an a/c blend door with stripped gears.seek diag on which one or try to find it yourself and repl as required