I'm not ever terribly worried about letting mine get cold, but I'm a little more wary of heat. Inside the trunk, in it's case, probably okay (I'd be extra sure to park in the shade). But I've baked cookies on the dash of my car in 108*F sunny days. And I sure as heck wouldn't leave an all-black CF guitar in direct sunlight on a sunny day, since the surface of a black car can get hot enough to leave second-degree burns in those conditions. Really, my only concern with extreme temp fluctuations is the poly finish checking.
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