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For what it's worth, I blocked 2 of the 3 lower grilles on my Focus and it ran COOLER. Without them, on a hot day, with the A/C on, it would run between 87 and 89C, with them, it was 85-87C.
Now, with it fully blocked off, I did manage to get the car q bit on the toasty side on a 4F day. Gotta be careful. Mine is a manual, so no A/T to make heat. I'm going to experiement with blocking about 2.5/3 of the grilles off to see if that helps
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