On vacuum the loss of heat it's very slow. But the gain of heat, from sun, it's quite fast.
Some space ships, satelites, can have a very hot side, the side faced to sun, and a very cold extremelly freezing side, the one oposite to sun.
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Originally Posted by freebeard
Half of them are radiators, held perpendicular to the solar panels' orientation.
On a car you could have air channels on the backside and suck the heated air into a warm air intake. If one is needed.
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