TM 9-2320-289-34
Table 2-1. Mechanical Troubleshooting (Con’t)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
ENGINE COO/ANT HEATER
40. WILL NOT START
Step 1.
Replace igniter. (See paragraph 11-2)
Step 2.
Remove limit switch. (See paragraph 11 -2) Check for continuity through switch
contacts.
If there is no continuity, replace limit switch.
Step 3.
Replace flame switch. (See paragraph 11-2)
Step 4.
Remove thermostat valve. (See paragraph 11-2) Inspect all components for
looseness or damage. Check fuel line connectors for clogs.
Tighten any loose components, Replace any damaged components. Clean
fuel line connectors if clogged.
41. WILL NOT SHUT OFF
Step 1.
Disconnect electrical connector at electric fuel pump to shut off engine coolant
heater, Remove thermostat valve. (See paragraph 11-2) Inspect all components
for looseness or damage, Check fuel line connectors for clogs.
Tighten any loose components. Replace any damaged components. Clean
fuel line connectors if clogged.
42. HEATER OPERATES; ENGINE REMAINS COLD
Step 1.
Check engine coolant level.
Fill cooling system if low. (See LO 9-2320-289-12)
Step 2.
Remove motor. (See paragraph 11-2) Check to see if coolant pump hoses,
coolant pump passages, and blade slots are clogged. Inspect all components for
damage.
Disassemble and clean motor to remove clogs. Replace any damaged
components.
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