TM 9-2320-361-10 2-57. OPERATION OF VAN BODY HEATER (PRIMARY AND SECONDARY) KITS (Contd) (6) After spot heating, remove auxiliary duct (11) from duct (1). Install auxiliary duct (11) by buckling three straps (10) Position duct (1) on deflector (2) and install by buckling straps (3) and (4). (7) To shut off heater, refer to b. of this para. 2-58. OPERATION OF WINDSHIELD WASHER KIT To operate windshield washer kit, refer to para. 2-6. 2-59. OPERATION OF SWINGFIRE HEATER a. General. The swingfire heater is a portable heater t hat can be used to heat the cargo body enclosure and engine of M35A2 cargo trucks equipped with swingfire heater arctic winterization kit. It may also be used to thaw frozen equipment. CAUTION Use only gasoline to operate swingfire heater, Using any other fuel may result in damage to swingfire heater. NOTE Each swingfire heater has its own fuel tank, b. Operation of Swingfire Heater. (1) Remove fuel tank cap (16) and fill fuel tank (15) with gasoline. Install fuel tank cap (16). (2) Depress pressure pin (14) to check operation of air shutoff valve. If pressure pin (14) does not return to out position, notify your supervisor. (3) Loosen wingnut (17) by turning counterclockwise and open cover (12). (4) Turn diaphragm valve (18) all the way clockwise. (5) Install cover (12) and tighten wingnut (17) by turning clockwise. (6) Close fuel regulator knob (13) by turning clockwise. 2-215