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Fourth rear window in 3 years to shatter on its own. Different weather conditions on each day it broke, car not sealed tight ie. window open. Once while in car driving it broke. Glass company can't figure it out. Every thing checks out all right, hasn't been in an accident.

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Out of curiosity what year is your Pacifica? –  Mark Johnson Nov 26 '12 at 19:55
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Looking at the shatter panel on the window, can you see an area of stress? Do all the windows break the same way? The weather might not play a part, if say you have something pressing or inadequately putting abrupt pressure on the glass. I have seen it where a screw was placing pin point pressure, and breaking windows.

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Somehow the window frame could be tweaked too. You don't have to be in an accident to bend stuff, I shifted my alignment last year in a stiff snow bank. –  Eric Fossum Dec 12 '12 at 0:11
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