Symptom Tree t023
| Cause | Correction |
|---|
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Electronic fault codes active or high counts of inactive fault codes |
Refer to Section TF in the Troubleshooting and Repair Manual, Fuel Systems and Electronics, B5.9G, C8.3G, L10G-III, Bulletin 3666118. |
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|
Fan drive belt is broken |
Check the fan drive belt. Replace the belt, if necessary. Refer to Procedure 008-002. |
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|
Coolant level is below specification |
Inspect the engine and cooling system for external coolant leaks. Repair if necessary. Add coolant. Refer to Procedure 008-018. |
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Temperature gauge malfunction |
Check or replace the temperature gauge. Refer to the OEM service manual. |
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|
Water pump is malfunctioning |
Check the water pump for correct operation. Replace the water pump if necessary. Refer to Procedure 008-062. |
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|
Thermostat is not correct or is malfunctioning |
Check the thermostat for the correct part number and for correct operation. Refer to Procedure 008-013. |
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|
Cooling system hose(s) collapsed, restricted, or leaking |
Inspect the cooling system hose(s) for restrictions or obstructions. Refer to Procedure 008-045. |
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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. Refer to the OEM specifications. |
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Fan drive or fan controls are malfunctioning |
Check the fan drive and controls. Refer to Procedure 008-026. |
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Radiator core is internally obstructed or damaged, or the check valve or J-tube is malfunctioning |
Inspect the radiator and clean if necessary. Refer to the OEM service manual. |
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Plugged cooling passages in the cylinder head, head gasket, or cylinder block |
Pressure-test the cooling system. Refer to Procedure 008-018. |
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Air or combustion gases are entering the cooling system |
Check for air or combustion gases in the cooling system. Refer to Procedure 008-019. |
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|
Cooling system has insufficient capacity |
Refer to Procedure 008-018. |
