TM 9-2350-277-10
OPERATE ENGINE COOLANT HEATER (BELOW 25 F (31 C)) -- Continued
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5.
Move RUN-OFF-START switch to RUN as soon as indicator light comes on. Do not stop in OFF position.
6.
If coolant heater does not start, repeat Step 4 and Step 5. If coolant heater does not start after three tries, troubleshoot
NOTE
Coolant heater always starts at low heat. It switches to high heat if HI-LO switch is set to HI.
7.
Move HI-LO switch to HI or LO.
NOTE
When HI-LO switch is at HI, heater will automatically go to low heat if coolant temperature
reaches 190 F (88 C). It will go back to high heat if coolant temperature drops to 120 F (49 C).
If coolant reaches a temperature of 245 F to 260 F (118 to 126 C), heater will stop and must be
restarted.
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