ENGINE COOLANT HEATER KIT
General. Engine coolant heater is not designed for use while vehicle engine is operating. This heater preheats
engine coolant in preparation for starting at extremely low temperatures or to maintain engine in standby readiness.
Engine Coolant Heater Operation.
Exhaust gases will kill. Do not operate engine coolant heater in closed
area occupied by personnel. Failure to do this will result in injury or death.
Coolant shutoff valves on engine must remain open at all times when
operating heater. Failure to do this will result in damage to heater.
Open coolant shutoff valves (1) and (2).
Open electric fuel pump shutoff valve located near air cleaner assembly by turning valve lever (3) one-quarter
turn counterclockwise. Open two valves (4) for M939A2 series vehicles.