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Hi David,
I for one hadn't heard your idea, and I must say I like it. I think it may work as a partial grill block for low speeds. My only worry would be that the reason you don't need as much cooling at higher speeds is because you get so much more air flow around your radiator, and that removes the heat. If you were to block the entire grill at speed you may run into overheating problems. Perhaps half of the grill could be actuated, and the other half could be blocked with the spring. This would be easiest in cars like mine with two openings in the bumper.
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