Quote:
Originally Posted by arcosine
Venting on top would put a lot of dirty air over the car body.
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There are some ultra high performance cars that vent radiator air over the hood for better aerodynamics. One possible downside for production cars is the chance of coating your windshield with glycol while driving, if there is any sort of cooling system failure. Also, high performance cars are designed to be driven with big engines and pedal to the floor, generating much more waste heat than your average hypermiler. IMHO if you are already using some sort of grill blocking we are splitting hairs here. Try sealing the underbody and monitor your engine temperature.