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I read once about someone making a butane heatpipe (with plastic pipe) for his motor controller. Sounded wacky, but apparently worked quite well, other than leaking and needing the occasional refill. The radiator was next to the windshield.
Heat pipes are actually pretty common, but there are a couple of crazy ideas here. The anti-freeze mixture would separate when evaporated, so it won't protect against freezing. Also, if you attach a vacuum to it, it will all boil off, leaving you with no working fluid. They initially evacuate the heat pipe, especially with water, but then they seal it up. If it's not static, it's a heat pump, not a heat pipe.
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