TM 9-2350-247-10
OPERATE ENGINE COOLANT HEATER KIT (M548A3) — Continued
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NOTE
The coolant shutoff valve (inlet) should be opened only during operation of the engine coolant
heater. The coolant shutoff valve (outlet) may be left open at all times.
3.
Open both shutoff valves by turning valve handles counterclockwise as far as they’ll go. One coolant shutoff valve (inlet)
is at the upper right front corner of the engine. Another coolant shutoff valve (outlet) is on the lower left side of the
engine next to air cleaner.
4.
Press the indicator light housing. If the light glows, you know you have power to the heater controls. If the light doesn’t
glow when you press the housing, troubleshoot heater (WP 0055 00).
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