OPERATE ENGINE COOLANT HEATER KIT (M548A1) Continued
The coolant shutoff valve should be opened only during operation of the engine coolant heater.
The coolant diverting valve may be left open at all times.
Press the indicator light housing. If the light glows, you know you have power to the heater controls. If the light doesnt
glow when you press the housing, notify unit maintenance.
Overheating will damage the batteries. Dont use the engine coolant heater if the temperature is
C). Make sure both manual shutoff valves are open before you start the heater.
If coolant doesnt flow, the heater will be damaged.
Hold RUN-OFF-START switch to START until indicator light comes on. Then move switch straight to RUN without
stopping in the OFF position.