Welp, my grill block (lower -- there's only a small slot below the hood left for air flow) didn't cause me any issues yesterday, when it was 90-something degrees. Temp gauge never moved above it's usual half way mark. Nor did it on a highway climb up the mountain to get out of this town a couple of weeks ago. This is on my Firefly.
The cooling fan comes on when you stop moving. And it certainly aids warm up time the rest of the year!
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