Symptom Tree t019
| Cause | Correction |
|---|
|
Coolant level is above specification |
Check the coolant level. Refer to the OEM service manual. |
 |
|
External engine leak |
Inspect the engine and its components for seal, gasket, or draincock leaks. Inspect the radiator, heat exchanger, cab heater, hoses, and connections. Pressurize the cooling system if necessary to determine source of leak. Refer to the OEM service manual. |
|
|
Cooling system hose(s) collapsed, restricted, or leaking |
Inspect the cooling system hose(s) for restrictions or obstructions. Refer to Procedure 008-045. |
|
|
Cooling system pressure cap is not correct, is malfunctioning, or has a low-pressure rating |
Inspect the pressure cap. Refer to Procedure 008-047. |
|
|
Coolant loss through radiator overflow |
Check and review OEM plumbing to make sure no high-pressure coolant can cause backflow. Check vent lines and fill line for restriction. Refer to the OEM specifications. |
|
|
Transmission oil cooler or torque converter cooler is leaking |
Check the transmission oil cooler and torque converter cooler for coolant leaks. Refer to the manufacturer’s instructions. |
|
|
Turbocharger housing is leaking |
Remove and pressure test turbocharger. Replace if necessary. Refer to Procedure 010-033 or 010-049. |
|
|
Coolant is leaking into the lubricating oil |
Check for coolant in the oil. Refer to the Coolant in the Lubricating Oil symptom tree. |
|
|
Coolant is leaking into the combustion chamber |
Remove the cylinder head, and inspect cylinder head, gasket, and pistons for evidence of coolant. Refer to Procedure 002-004, 002-021, or 001-043. |
|
|
Radiator or cab heater is leaking coolant |
Inspect the radiator, cab heater, hoses, and connections. Refer to Procedure 008-042 and the OEM service manual. |
|
|
Engine is overheating |
Refer to the Coolant Temperature Above Normal – Gradual Overheat and Coolant Temperature Above Normal – Sudden Overheat symptom trees. |
