I have had this same "rattle" noise for a while. More noticible when the temp is cooler. It sounds like it is coming from above the driver's side speaker on my truck. Pushed down on the dash above speaker and noticed that the foam under the windshield also moved when I pushed down on the dash.
I wonder if when I go over bumps if the foam is rubbing on the inside of the windshield.
Looking for any input if this could be the issue or if anyone has located the exact problem. I have tried other suggestions in the is thread but no luck.