Symptom Tree t020
| Cause | Correction |
|---|
|
Coolant level is above specification |
Check the coolant level. Refer to the OEM service manual. |
 |
|
External coolant leak |
Inspect the engine for coolant leaking from hoses, draincocks, water manifold, jumper tubes, expansion and pipe plugs, fittings, radiator core, air compressor and cylinder head gaskets, lubricating oil cooler, water pump seal, cylinder block, and OEM-mounted components that have coolant flow. If necessary, pressure-test the cooling system. Refer to Procedure 008-018. |
|
|
Aftercooler is leaking (aftercooled engines only) |
Check the aftercooler and connections for leaks. |
|
|
Radiator cap is not correct, is malfunctioning, or has low-pressure rating |
Check the radiator pressure cap. Refer to Procedure 008-047. |
|
|
Fill line or vent lines are restricted, obstructed, or not routed correctly |
Check the vent lines and the fill line for correct routing and for restriction. Procedure 008-047 |
|
|
Coolant fill line is restricted or obstructed |
Check the coolant fill line for restrictions or obstructions. Refer to the OEM service manual. |
|
|
Cooling system hose is collapsed, restricted, or leaking |
Inspect the hoses. Refer to Procedure 008-045. |
|
|
Air or combustion gases are entering the cooling system |
Check for air or combustion gases in the cooling system. Refer to Procedure 008-019. |
|
|
Engine is overheating |
Refer to the Coolant Temperature Above Normal symptom tree. |
