TM 9-2320-387-10
a. Operation.
(2) Slide defroster register (1) to the right to open defroster.
(3) Pull fresh air control knob (2) in to close vents (5).
(4) Position heater control knob (3) to desired setting.
(5) Flip heater fan switch (4) up to turn on heater.
b. After Operation.
(1) Flip heater fan switch (4) down to turn off heater.
(2) Slide defroster register (1) to the left to close defroster.
