That was my initial thought too. I didn't read too much into the higher underhood temps when I first saw them, I was thinking that it was due to lower air flow where the temp sensor is located. But when the coolant temps went up I figured I should be safe and not melt my engine.
If the difference wasn't so dramatic between grill block vs. no block I'd think there might be something else going on. But the efffect was so big and obvious it has to be the grill block.
Any other thoughts about this?
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