Originally Posted by Airdog
My 2009 Sport had this problem. The T shaped defrost duct behind the radio was too tight and would rattle with movement (there is a foam seal on it that hides the joint). Since the duct is glued to the dash board, any time the dash board vibrates it cause the two ends of the duct to rattle together and resonate through the dash. I ended up removing the foam seal and taped them with some gorilla duct tape...no more rattles.
Here's a video of exactly what I heard... very pronounced at the :40 sec mark.
You're the man!
I had a free moment, decided to google dash rattle; thinking my annoying rattle since nearly new is still annoying, maybe someone else has had it and fixed it.
Click this thread...scroll down...and see a familiar video! That's my truck!
And, my rattle.
Currently 17,450 miles and still rattling away.
But, the best part - you found the source of "the" or similar rattle. I know what I am doing tomorrow morning!