Cummins N14 STC, Celect, Celect Plus – Service Manual Coolant Temperature Above Normal – Sudden Overheat

Symptom Tree  t023

This is symptom tree
Cause Correction

Electronic fault codes active or high counts of inactive fault codes

Refer to Section TF in the CELECT Plus™ Systems Troubleshooting and Repair Manual, Bulletin 3666130, or Section TF in the CELECT™ Systems Troubleshooting and Repair Manual, Bulletin 3666084.


Fan drive belt is broken

Check the fan drive belt. Replace the belt, if necessary. Refer to Procedure 008-002 in Section 8.


Coolant level is below specification

Check the coolant level. Check for an external leak. Refer to Procedure 008-018 in Section 8. Sample the lubricating oil and have a laboratory check for coolant in the oil (internal leak).


Charge-air cooler fins, radiator fins, or air conditioner condenser fins are damaged or obstructed with debris

Inspect the charge-air cooler, air conditioner condenser, and radiator fins. Clean, if necessary. Refer to Procedure 010-027 in Section 10 and Procedure 008-042 in Section 8.


Cooling system hose is collapsed, restricted, or leaking

Inspect the hoses. Refer to Procedure 008-045 in Section 8.


Radiator cap is not correct, is malfunctioning, or has low-pressure rating

Check the radiator pressure cap. Refer to Procedure 008-047 in Section 8.


Radiator shutters are not opening completely or the shutterstat setting is wrong

Inspect the radiator shutters. Repair or replace if necessary. Refer to Procedure 008-049 in Section 8. Check the shutterstat setting.


Cold weather radiator cover or winterfront is closed

Open the cold weather radiator cover or the winterfront. Maintain a minimum of 784 cm2 [122 in2] or approximately 28 x 28 cm [11 x 11 in] of opening at all times. Refer to the OEM service manual.


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 Procedure 008-017 in Section 8 and the OEM service manual


Radiator swing check valve is malfunctioning (if equipped)

Check the swing check valve for correct operation. Refer to the OEM service manual.


Fan drive or fan controls are malfunctioning

Check the fan drive and controls. Refer to Procedure 008-027 in Section 8.


Air or combustion gases are entering the cooling system

Check for air or combustion gases in the cooling system. Refer to Procedure 008-019 in Section 8.


Torque converter cooler disc is not installed correctly

Check the disc for correct installation. Refer to the OEM service manual.


Cooling system component is malfunctioning

Perform the cooling system diagnostics test. Refer to Procedure 008-019 in Section 8.


Thermostat is not correct or is malfunctioning

Check the thermostat for the correct part number and for correct operation. Refer to Procedure 008-013 in Section 8.


Water pump is malfunctioning

Check the water pump for correct operation. Replace the water pump, if necessary.

Last Modified:  02-Jan-2012