Click on window roll down.
 

When I roll my driver's side window down it makes a noticeable click sound when it reaches half way. It's a lot less noticeable when I roll the window up. There is no noticeable different in speed when it clicks or any kind of odd movement. Any ideas?

I noticed this a couple of times and nothing since

Could it be when you pushed the switch all the way down for auto?

No, it's from the window. Does it when I manually hold it down or let it go itself.