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Less air flow doesn't necessarily mean worse cooling. Especially if you form a duct that makes all the air going in the grill through the radiator. On some cars, the air comes *out* of the upper grill, or there is more than is needed. It is the stylists who determine the grill opening, not the cooling engineers.
I have down to about 20% of the original opening, and closed the openings that were venting air out before the radiator, and I have not yet overheated. The cooling fan may run a little bit more often, but not much.
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