TM 9-2350-247-10
TROUBLESHOOTING TABLE—Continued
0056 00
INITIAL SETUP:
Maintenance Level
Operator
ENGINE COOLANT HEATER KIT
Table 6. Troubleshooting Procedures.
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
1. COOLANT HEATER DOES NOT
START WITH RUN-OFF-START
SWITCH HELD IN START
POSITION.
1. Check if MASTER SWITCH is
OFF.
Turn MASTER SWITCH ON.
2. Defective heater.
Notify unit maintenance.
2. COOLANT HEATER
OVERHEATS.
1. Check if one or both coolant
shutoff valves are closed.
Open coolant shutoff valves
(WP 0040 00), (WP 0041 00).
3. COOLANT HEATER OUTPUT
IS TOO LOW.
1. Check if the HI-LO switch is in
LO position.
Move HI-LO switch to HI position
(WP 0040 00), (WP 0041 00).
4. BATTERIES OVERHEAT.
1. Air temperature is too warm to
need the engine coolant heater.
Turn off engine coolant heater
(WP 0040 00), (WP 0041 00). You do
not need to use heater if temperature is
above -25
F (-32
C).
2. Engine and engine coolant heater
are both running.
Turn off engine coolant heater
(WP 0040 00), (WP 0041 00) as soon
as the engine starts.
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