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This why I only run a upper grill block, with a partial lower one.
Last winter I did a full upper and lower grill block and it worked for short trips. Other than that I left 3-6" open on the bottom. This cooled the coolant, and the engine bay still had ice on the bottom.
The other way to measure is to look at intake temps, that draws air from the engine bay. I have only seen a 5F increase in intake temps during winter, summer it is 5-10F.
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