TM 5-2420-230-24-2
3.9 and B5.9 Series Engines
Troubleshooting Symptoms Charts
Section TS - Troubleshooting Symptoms
Page TS-15
Coolant Loss
This is symptom tree T019.
Cause
Correction
Check the coolant level. Refer to the OEM
Coolant level is above specification
.......
service manual.
OK
E
Inspect the engine and its components for
seal, gasket, or draincock leaks. Inspect the
radiator, heat exchanger, cab heater, hoses,
xternal engine leak
.......
and connections. Pressurize the cooling
system if necessary to determine source of
leak. Refer to the OEM's service manual.
OK
C
ooling system hose is collapsed, restricted, or
Inspect the radiator hoses. Refer to Procedure
.......
leaking
008-045.
OK
C
ooling system pressure cap is not correct, is
Inspect the pressure cap. Refer to Procedure
.......
malfunctioning, or has a low-pressure rating
008-047.
OK
C
Check and review OEM plumbing to make sure
no high-pressure coolant can cause backflow.
Check vent lines and fill line for restriction.
oolant loss through radiator overflow
.......
Refer to the Application Engineering Bulletins,
Midrange Cooling Requirements, AEB 90.24,
and Coolant Recovery System, AEB 91.07.
OK
T
Check the transmission oil cooler and torque
ransmission oil cooler or torque converter
.......
converter cooler for coolant leaks. Refer to the
cooler is leaking
manufacturer's instructions.
OK
W
Remove and pressure test turbocharger.
et exhaust manifold and turbine housing
.......
Replace if necessary. Refer to Procedure
(marine and firepump engines only)
010-033 or 010-049.
OK
C
Check for coolant in the oil. Refer to the
oolant is leaking into the lubricating oil
.......
Coolant in the Lubricating Oil symptom tree.
OK
B
(Continued)
L-599
