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Which of these is true about the radiator shutters and the winterfront?

A You should remove ice from the radiator shutters.
Explaination
In extremely cold weather, very cold air flowing onto the radiator and through the engine compartment can prevent the engine from warming up (and also keep your heater from working well). Radiator shutters or a winter front restrict this air flow to let the engine warm up. However, don't overdo it. Keep the winter front partially open or keep the radiator shutters free from ice. If the shutters freeze shut or the winter front is closed too tightly, the engine may overheat from lack of sufficient air.
B The winter front should be closed tightly.
C The engine may overheat if the winter front is left open.