TM 9-2320-272-10
Table 3-1. Troubleshooting (Contd).
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
46.
ENGINE COOLANT HEATER FAILS TO START WHEN RUN-OFF-START SWITCH IS HELD IN START
POSITION.
WARNING
Exhaust gases can kill. Do not operate engine coolant heater in closed area occupied by personnel.
Such action will result in injury or death.
CAUTION
Do not operate engine coolant heater and personnel heater at the same time. Damage to equipment may
result.
NOTE
•
Select HI position if engine is cold. Select LOW position if engine is already well heated. Switch will
automatically change to LOW position when coolant temperature exceeds 195°F (91C). Switch will
automatically change to HI position when coolant temperature drops below 120°F (490C).
•
Heater will not operate if RUN-OFF-START switch is moved to RUN position before indicator lamp
illuminates.
Step 1.
Press PRESS-TO-TEST button on heater control box to check operation of circuit.
If indicator lamp does not illuminate, notify unit maintenance.
Step 2.
Check fuel level on fuel gauge.
Fill fuel tank(s) if necessary.
Step 3.
Check to see if electric fuel pump shutoff valve located near air cleaner assembly is closed (para. 2-45).
If closed, open fuel shutoff valve.
47.
HEATER FAILS TO CONTINUE BURNING.
Check fuel level on fuel gauge.
Fill fuel tank(s) if necessary.
3-18
