TM-9-2320-280-10 HMMWV Operator Manual Download
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TM 9-2320-280-10 2-19. HEATER OPERATION (ALL EXCEPT A2 VEHICLES) To operate heater: (1) Start engine (para. 2-10). (2) Push fresh air intake lever (4) forward to close grille. NOTE Perform step 3 if air flow to floor of vehicle is closed. (3) Loosen thumbscrew (3) and position deflector to allow air flow to floor of vehicle. Tighten thumbscrew (3). (4) Slide baffles (2) to the left to open air vents. (5) Turn heater fan switch (6) "ON" to desired setting, “HIGH" OR "LOW." NOTE For maximum heat, pull heater control knob all the way out. (6) Position heater control knob (5) to desired setting. (7) Push defroster control knob (1) in. 2-119