The 'Engine Room Winterization Hatch', as EMD called it, 'consists of a housing and a damper over the #1 cooling fan to divert, when so set, warm air into the engine room. In the summer position, the duct leading to the engine room is shut off, and all the air from the #1 cooling fan is exhausted to the atmosphere. In the winter position, a portion of the air is diverted to the duct, which leads to the engine room. A handle on the outside of the duct, secured in position by a bolt, controls the operation of this winterization feature.' Thus, someone had to climb up on the hood at the start and end of the cold weather season to change the positioning of the damper.