Have noise coming from roof and windshield area like rattling and thumping when traveling 70mph and higher.
Anyone else had this problem? Dealership does not know.
Thanks in advance for any help.

 

Is it just a little annoying rattle? If you have an aftermarket bug deflector they have been known to cause a rattle because of the way they change the airflow. If you have one, try taking it off and drive a while like that. If it doesn't make the noise, that's your problem.

I've been told that if you buy a bug deflector from Chevy it won't make the rattle.... I've never tested it so, I can't say for sure.

 

yep..bug shield