I hear squeaking noise when i go over rough road form center dash air vent with navigation , and i also hit the vent from the top with my hand and i hear the same squeak noise . i wonder if anyone else has the same problem? or if anyone removed the center dash vent to tell me how to remove it i am afraid to snap the clips.

 

I found the problem, removed the center dash vent out, found loose screw that holds navigation screen at the bottom, secure it back and squeak is gone.