I still haven't bothered to try anything out. My daily commute is 7 miles at a top speed of 45 mph. In winter I get up to temp, and all the excess heat goes to heating the cabin. There is no chance of overheating.
That being said, this weekend I took a trip across state. Half of the trip was 55 mph country roads. With the heat set to max hot, and the fan on about 1/4 speed the fan came on about 3 times. At 60 mph the coolant temps rose a lot faster and I needed to pull one of the foam pieces out of the upper grill.
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