Well... It is sucks!!

66Dvert said
look for a butterfly part of the window. that will tell you where th e stress point was , fix that before you install another window.

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I'd look here in this area. for a kinked or jagged piece of metal or something in the gasket itself.

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I would have to agree ^^^^^ with the starting point at the Red Arrow Area. I blew up the picture to full screen on my computer to see finer detail, it looks like a blast pattern starting at the Red Arrow on the passenger side and moving across the window to the driver's side. Starts at Red Arrow and Funnels out to the driver's side from there.