CONTROLS AND INSTRUMENTS the surge tank and the radiator cap necessary. Refer to the section of replenishment should be made at should not be removed unless "SERVICE AND MAINTENANCE" WARNING Coolant level check or Radiator surge tank for more details. 1. Make sure that the roof ventilator is closed completely by turning the handle clockwise. 2. Turn the switch to "OUT". Turn the knob in a counterclockwise direction. The rear of the roof ventilator will open which expels stale air in the cab. It can even be opened in a light rain. OUT CLOSE - 2–39 - OPEN Expelling stale air 1. Make sure that the roof ventilator is closed completely by turning the handle clockwise. 2.
Turn the switch to "IN" and turn the handle in the OPEN direction (counterclockwise). The front of the roof ventilator will be open and the outside air will flow into the cab. IN CLOSE Induction of the outside air OPEN CLOSE OPEN IN