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I tracked down my earlier observation of increased temps as being caused by having the A/C on. Without the A/C, it never creeps over 195°F even at 90°F ambient.
I've got the same auxillary cooler as apc, and I've noticed no abnormalities with coolant temp (well, other than the A/C), fan, or transmission with my grill blocks. I've now driven over 20,000 miles with a grill block in one form or another.
I did recently remove the lower half, but that was due to going on a long camping trip with our trailer. My 90-day average mileage took a big hit due to this, but hey, it's what the truck is for.
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