my 4th Gen have problem with the air condition..
liike... when i change air blow to " windscreen " mode..
i can hear some motor noise.. and some "click click click" for a while. is it fine for other air blowing mode.. it just happen when ever i switch to windscreen mode. amd there have no air come out to the windscreen. sounds like it tried to switch to windscreen mode. but some how.. it stuck!!

GREEN: The Mode Switching Motor
RED: Those are the sections the pin couldn't go thru. stuck! and that was the "click click" noise.

Wonder.. i think the motor is kinda dying.. so i think replace the motor will help.. what do u guys think!!