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All of these are cool ideas but the underlying problem is that you won't be able to reject enough heat - the surface area for heat transfer in your average radiator is more surface area than the entire outside of your vehicle! ((assume 16"x24" radiator which is dual row 1/2" fins and .125 spacing = 43 square feet. This is just the fin area and not the tube area - note that they are all aluminum and very thin.
If you are stopped at a light, your fan still pushes air through the radiator, but if you use a body panel you are SOL.
An air cooled vehicle will be far worse as you will need to duct significantly more air through the engine compartment as the key loop is far less efficient (The real heat transfer is from the combustion chamber)
Heat pipes are far less efficient than forced liquid cooling.
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