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Diesel Engine Troubleshooting Symptoms
35
Coolant Loss
This is symptom tree T-013.1
Cause Correction
Radiator or cab heater is leaking
Inspect the radiator heater, hoses, and
connection to locate the leak. If oil is present in
the coolant, check for a transmission or
lubricating oil cooler leak.
OK
External engine leak
Inspect the engine and components for seal,
gasket, or drain cock leaks.
OK
Overheating or compression gases are leaking
Resulting in loss through the radiator overflow
Review the operation for overheating and low
power. Refer to troubleshooting logic for
Coolant Temperature Above Normal.
OK
Transmission cooler is leaking (if equipped)
Check for mixing of coolant and transmission
fluid.
OK
Cylinder head gasket is leaking
Check or replace the head gasket.
OK
Cylinder head is cracked or porous
Check or replace the cylinder head.
OK
Cylinder block coolant passages are leaking
Check or replace the cylinder block.