Abstract: An improved winterfront is disclosed for use on trucks having grills without a center bar spanning the width of the grill. The winterfront is mounted in front of a grill on the truck in order to restrict the quantity of cold ram air that would otherwise flow through the grill and then around and through the engine fan toward the engine and driver's compartment of the truck. The winterfront includes a ram-air-blocking portion and fasteners that removably fasten the ram-air-blocking portion to the truck. The winterfront also includes an opening completely surrounded by the ram-air-blocking portion of the winterfront. The opening in the blocking portion has a center which is aligned with the axis of rotation of the engine fan so that the flow of air through the opening is directed symmetrically about the axis of rotation of the engine fan.