It's when you lock the bow up in the car on a hot day with the windows rolled up and the vehicle, in direct sunlight. THAT is when the air temps inside the car get hot enough to damage a bow. It's especially true for laminated limbs. Solid glass limbs aren't immune, but they can stand a bit more abuse. Never leave your bow where it can get too hot to touch.

Even if the bow does get that hot and your limbs do manage to hang together, letting the bow get hot will really cause your string and cable(s) to creep. A LOT! Having to retun would a certaintly. Having to replace the string/cable(s) would be possibility. It's always a good idea to at least keep your bow in the shade.