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Old 01-20-2013, 09:05 AM   #35
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Not sure Kysor shutters or taping off grille openings will have anything to do with how quickly the car warms up.

Until coolant in the engine reaches a "normal" temperature the thermostat is closed, preventing the warmed coolant from circulating through the radiator. So while closed shutters reduce drag, preventing air from flowing over stagnant, ambient temperature coolant in the radiator shouldn't speed warm-up. I suppose closed shutters would increase underhood air temps a bit, that really shouldn't affect warm-up times in any significant way.
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