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The way I have my grill block it opens about 1.5 inches in each slot and seems to work as well as stock. I have to drive over 25 miles of back roads with the block open before the fan even thinks of coming on. Then I open the other half and the fan stays off. that with temps in the low 90s F.
So I would think your slots are too small. can you make a new cover with wider slots to test the idea?
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