My car stays out in the sun almost all the time. I live in Atlanta, Georgia. The grille is cracking on the horizontal pieces, and most of these cracks are next to the vertical pieces. I really have no clue as to why it would crack. The car is in the sun, sure, but there are only a few months in the year when the temperature will get above 85 or so. Perhaps it is a combination of high humidity and heat. I have no idea.
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