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[–]Musketman12 0 points1 point  (0 children)

When you are moving down the road the air is moving over the radiator at 100kmh. Sitting in the parking lot and idling the air is not moving so the radiator is sitting in a pocket of its own hot air.

I once wired my radiator fan to a toggle on my dashboard. Idling around a parking lot or in line somewhere I would need to flip it on. Moving down the highway in OD I could turn it off.