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Before you block the grille, make sure you seal up the radiator. Any air that is still able to get through the grille, you want it going through the radiator, as opposed to around it.
After that, just start making black strips about 2-3" wide and as tall as your grille, and fasten them to the inside so you can't really see them, starting from the outside and working your way in until you're comfortable with what you have.
Once you seal your radiator, you could probably easily block 30% of your grille and not even notice a difference in temps.
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"¿ʞɐǝɹɟ ɐ ǝɹ,noʎ uǝɥʍ 'ʇı ʇ,usı 'ʎlǝuol s,ʇı"
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