TM 9-2320-387-10
a. Operation.
(2) Slide defroster register (2) to the right to open defroster.
(3) Adjust vents (1) to closed position.
(4) Flip fan switch (4) to desired setting, HIGH/LOW.
(5) Flip A/C / HEAT switch (3) down to turn on heater.
b. After Operation.
(1) Flip fan switch (4) to OFF position.
(2) Slide defroster register (2) to the left to close defroster.
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2-76.1