well i'll bet you a beer that i know whats wrong, You MUST have properly working themostat or the hot water in your engine will rush right back in with no obstructions and time to cool down that is why this happens at idle, when your moving there is so much fresh air going through radiator it cools to much, a cold engine below 180 actually will wear out faster believe it or not. your fan could never compete with the volume of 60mph.
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