I have been able to quiet it down by placing foam tape throughout the quarter panel dash I did seem to think it was coming from the radio and put some cardboard as a wedge to help it from moving. That didn’t do it. After i padded the quarter panel trim, one time out of three or four times so far i think i was getting some rattle from the union at the defroster grill (on panel) and the duct. For example, everything was fine this morning on the drive in. I was a
little concerned the tape i used was to thick. I did hear the dash creek from expansion heat (not moving) and I am thinking maybe it has settled in. This weekend i am set to get some flock tape and I am going to try and covertly put some tape around the duct. So weird I got the sound after I padded the panel at random times. Maybe it has settled in? I doubt it.