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My heating ducts are not open to my engine bay and my hood is sealed on all sides. Rolling down the windows will not pull more air throught the engine bay. Also, windows down causes more of a load on the engine than the AC does. I did try driving on that trip with the heat on and the windows down and it was unbearable. Without the heat on, the engine temp kept fluctuating. The AC on mid heat was the only bearable option.
When I blocked the grill, I only had air going through the center lower 1" of the radiator (hard to explain, but my lower grill only has 1 - 2 inches of radiator surface. The rest of the rad is in the upper grill.). I think that I need air vertically across the entire rad. I think it will only need to be about 1 inch tall. I also thought about making a duct out of a clothes dryer hose and making it flat at the radiator end of it. This would allow me to cover the duct when it is not needed. I will keep experimenting until I get it right.
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