I had clapping wind noise from from the A Pilars coverings on top where they are overlapping the long plastic parts. Then I also noticed that there were cracks like you describe. My dealer confirmed the same as replied earlier. It is a warranty fix as soon as Hummer understands what the problem is and how to repair this.
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2006 Hummer H3 Adventure, Black with Cashmere Interior, PIAA Horns, SMA Heavy Duty Brush Guard, FlowMaster 50 Series Delta Flow Exhaust
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