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Why does the heater core transfer heat from the coolant, not the exhaust?
It would be hot almost instantly and would allow for an air cooled engine whose temperature could be controlled precisely by the amount of air that was let into the engine compartment.
The only reason I can think of is that it would be TOO hot, but that can be solved by just placing less heat exchange material on the pipe. It's probably be just fine to run the regular pipe through the airstream.
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