TM 9-4940-568-20
2-65
Table 2-7. Engine Troubleshooting (CONT).
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
19. COOLANT TEMPERATURE ABOVE NORMAL (165 F – 195 F) – SUDDEN
OVERHEAT.
Coolant level low.
Locate and correct the source of the coolant leak.
Temperature sending unit or gage malfunctioning.
Replace temperature sending unit (Para 8-34) or gage (Para 8-44).
Engine drive belt loose.
Replace engine drive belt tensioner (Para 8-32).
Engine drive belt missing
Replace engine drive belt (Para 8-31).
Radiator hose collapsed, restricted, or leaking.
Check/replace hose (Para 8-24).
Radiator cap incorrect or malfunctioning.
Replace the radiator cap.
Thermostat malfunctioning or incorrect.
Check/replace thermostat (Para 8-33).
Air in the cooling system.
If cooling system is aerated, perform cooling system service (Para 8-25).
Surge tank line from radiator plugged or restricted.
Check for obstruction or debris. Clear any obstruction or debris.
Water pump malfunctioning.
Check/replace the water pump (Para 8-28).
