d1. ENGINE OVERHEATS (CONT)
KNOWN INFO
TEST OPTIONS
YES
WARNING
CAUTION
Read WARNING and
CAUTION on
following page.
Visual Inspection
REASON FOR QUESTION
8.
POSSIBLE PROBLEMS
Does cooling system leak
externally?
Faulty upper and lower coolant
hoses.
Faulty radiator cap.
Faulty radiator overflow tank
and hoses.
Coolant level OK.
Radiator core free of debris.
WATER TEMP gage OK.
Radiator OK.
Loss of pressure in cooling
system.
Radiator fan shroud OK.
Charge air cooler OK.
Water pump OK.
Thermostat OK.
Fan clutch OK.
If external leaks are present,
upper coolant hose, lower
coolant hose, radiator overflow
tank hose(s), or radiator
overflow tank is faulty.
Perform Cooling System Troubleshooting
(d2. Oil in Cooling System).
Replace upper coolant hose (para 6-9),
lower coolant hose (para 6-10), radiator
overflow tank hose(s), or radiator overflow
tank (para 6-3).
NO
TM 9-2320-365-20-1
2-140 Change 1