Does heat damage computers while turned off?

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http://superuser.com – I'm well aware that overheating is a common source of damage to computers, but can high heat damage them even while powered off? And if it is possible, is it likely? I ask due to some old components that have been sitting in the trunk of my car for several weeks now, in 90°F+ mid-summer heat, and in the sun. I originally planned on recycling them, and stuck them in the trunk for transport, but today I thought of a new use for them, and I'm trying to decide if they're worth the trouble of re-purposing. If there's a good chance they're fried, then no, they're not. (HowTos)