TM-9-2320-280-10 HMMWV Operator Manual Download
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TM 9-2320-280-10 2-20. HEATER OPERATION (A2 VEHICLES) To operate heater. (1) Start engine (para. 2-10). (2) Push fresh air intake lever (3) forward to close grille. (3) Turn heater fan switch (4) “ON" to desired setting, “HIGH”or “LOW." NOTE For maximum heat, pull heater control knob all the way out. (4) Position heater control knob (2) to desired setting. (5) Push defroster control knob (1) out. 2-120