Symptom Tree t023
| Cause | Correction |
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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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Electronic fault codes active or high counts of inactive fault codes |
Refer to Section TF in the Troubleshooting and Repair Manual, CM870 Electronic Control System, Signature and ISX Engines, Bulletin 4021334, or Troubleshooting and Repair Manual, Electronic Control System, Signature, ISX and QSX15 Engines, Bulletin 3666259, or the Troubleshooting and Repair Manual, Power Generation Control Systems QSX15, QSK23, QSK45, QSK60, QSK78, and QST30 Series Engines, Bulletin 4021419 for fault code troubleshooting. |
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|
Fan drive belt is broken |
Check the fan drive belt. Replace the belt, if necessary. Refer to Procedure 008-002 or 008-003. |
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Fan drive or fan controls are malfunctioning |
Check the fan drive and controls. Refer to Procedure 008-027. |
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Radiator shutters are not opening completely, or the shutterstat setting is wrong |
Inspect the radiator shutters. Repair or replace if necessary. Check the shutterstat setting. Refer to Procedure 008-049. |
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Cooling system hose is collapsed, restricted, or leaking |
Inspect the hoses. Refer to Procedure 008-045. |
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Radiator cap is not correct, is malfunctioning, or has low-pressure rating |
Check the radiator pressure cap. Refer to Procedure 008-047. |
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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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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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Radiator swing check valve is malfunctioning (if equipped) |
Check the swing check valve for correct operation. Refer to the OEM service manual. |
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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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Torque converter cooler disc is not installed correctly |
Check the disc for correct installation. Refer to Procedure 008-062. |
