TM 9-4940-568-20
2-63
Table 2-7. Engine Troubleshooting (CONT).
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
18. COOLANT TEMPERATURE ABOVE NORMAL (165 F – 195 F) – GRADUAL
OVERHEAT.
Coolant level low.
Locate and correct the source of the coolant leak.
Radiator air cooling fins plugged, bent or damaged.
Using compressed air blow debris from fins, straighten cooling fins.
Air flow to the radiator inadequate or restricted.
Check radiator cooling fan (TM 9-4940-568-10).
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).
Cooling fan shroud damaged or missing.
Inspect shroud, replace or install.
Radiator cap incorrect or malfunctioning.
Replace radiator cap (Para 8-26).
Over concentration of antifreeze.
Perform cooling system service (Para 8-26).
