Re: Bad rattle question
I had the same thing. I'll bet it's the pillar post covers on the windshield. They vibrate so much it affects the dash. This is a common H2 problem. The dealers now use a tape-mastic combination which solves the problem. If you're handy open the door, pull the rubber trim off, unscrew the three phillips screws and pop off the simulated air cleaner bulges behind the hood ( you need them off to get the plastic pillar posts completely off so you can clean the windshield thoroughly before you put down mastic). Use a high grade epoxy mastic and you'll be in business. Since their is a GM TB out on this, the dealer "may" do it for free.
Mine did it around 65 and at first I thought it was the sunroof deflector, but I found on this forum it's a common problem and it can buzz your dash too.
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Hummer, like nothing else
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