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How about running the hot coolant through the inside of a double-walled aluminum belly pan, such that the belly pan acts as both an airflow improving and cooling device at once. The pan could even have fins hanging down an inch or so, keeping the airflow going straight front-to-back as well as providing further cooling to the fluid inside. Just keep the coolant away from the even hotter exhaust pipe, and watch out for speed bumps and rocks.
Didn't Toyota or Honda integrate a little steam turbine with a gas engine recently?
What is a radiator for? It removes excess heat. This heat comes from the fuel you payed for. I would say that instead of having a radiator at all we should be doing something about using all that heat for something. What I'd like to see is a diesel-stirling-electric hybrid. Imagine (or calculate) how far our cars would go if they actually used most of the energy from the fuel they burn.
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