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I've thought about using air to heat my Beetle's engine. It has nearly everything I need already built into the engine. There are two exhaust to air heat exchangers on each side of the engine. The engine is air-cooled, so all I'd have to do is route the heated air over the head fins. There is no liquid coolant, other that 5 pints of oil, that is used to cool the engine, so air is about my only medium to heat it.
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