2009 cab window noise
 

My 2009 Silverado WT single cab with crank windows makes a wind noise when window is about 1/2 way down. 1 crank in either direction allows air to make noise from the rear empty window track, kinda like blowing through a broken balloon.. I've tried armorall and silicone to soften rubber track, but it doesn't go away. It can be eliminated by pushing or pulling on the glass, but returns when you let go. Anyone else with this problem or a solution? Just got the truck with 45k and although it's in good condition, I don't know the history if it always did this. I'm a fresh air guy and I've got a thousand mile drive ahead of me and would love to leave this noise at home.