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Another reason why I special ordered my SEL without a sunroof. All of the high trim level Foci in the area all had sunroofs/rattle traps/potential water leaks, and now exploding roofs that the warranty won't cover. Since a lot of the problem seemed to be in the cold climate areas, I would offer up temperature differential as a cause. If it is really warm on one side of the glass and sub zero on the other, I could see some shattering. I bet the sunroof is not made to the same specs as the windshield, if it was it probably wouldn't be shattering.
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