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

Question

Accepted Answer

You should remove ice from the radiator shutters.. Section 2.13: Remove ice from the radiator shutters. Make sure the winterfront is not closed too tightly causing the engine to overheat.

Answer

The winterfront should be closed tightly at all times.

Answer

Ice on the shutters helps cool the engine.

Answer

They are not important.