I live in a city that can be bitterly cold in Winter in Alberta. I see a small number of passenger vehicles and quite a few trucks that cover their front grills with a type of cloth when the weather is very cold, minus -15 to minus-35 degrees in winter. Obviously this must be to prevent the cold air from being drawn through the radiator by the fan or even if the fan is not pulling in cold air just the forward movement of the vehicle drawing in cold air.
These cloth grill covers have a flap or flaps in the center that you can open and close. I am interested in purchasing one of these. Can the car overheat if the flap is closed for too long? At what minus temperature can you keep the flap closed all the time. At what minus temperature must you make sure that the flap is open.
Thanks in advance Denny B