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I have blocked up the "escape" vents in the chin area, so that as much of the air that comes through the small grill opening to go through the radiator instead of bypassing it. In other words, the factory grill opening is often way too big (done for styling) and then they dump a lot of air out through the chin area, because it is not needed to cool the radiator.
I have just a 15" x 4" opening below the bumper. That is no more than 1/6th of the area of the stock opening. Since I have blocked up the escape vents, and I have never overheated. The fan comes on at 204F and on really hot days, in dense traffic or climbing a very steep grade, the fan does come on, but it did that before I had any grill block.
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