Message: Hey guys, generally only when it's cold I get a fast rattle, or vibration coming from the base of the windshield when I'm going over hard dirt or sometimes if I hit a slight bump in the road. I don't know how else to describe it other than a buzzing noise. It's a GenIII (03 QC 4x4). I don't know what is causing it but it's annoying as it gets! Any suggestions?