BDC... ever heard of a steam engine? make something hot and when water hits it, it will turn to steam and evaporate and expand. I think that stuff's been around for a while... even longer than the duece coupe, for that matter. And its has proven reliable...
Nobody is trying to get something for nothing here. Pumping heat out your rad is just getting nothing for something! Take that heat, make it into steam, use that steam to keep pushing the car. Its not magic.
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