RACE-BEARING 6B0133 - Caterpillar

Use this procedure to troubleshoot a high coolant temperature condition. Also, this procedure covers the following event codes:
Table 1
Event Codes for High Coolant Temperature    
J1939 Code    Description    Information    
110-15     Engine Coolant Temperature : High - Least Severe (1)     This code is activated when the coolant temperature reaches
110 °C (230 °F).    
110-16     Engine Coolant Temperature : High - Moderate Severity (2)     This code is activated when the coolant temperature exceeds
110 °C (230 °F).
Engine power is derated.    
Illustration 1 g01383802
Engine power derate percentage versus coolant temperatureProbable Causes
High ambient temperature and/or high inlet air temperature
Low coolant level and/or coolant leakage
Insufficient flow of air through the radiator
Faulty water temperature regulator
Faulty coolant temperature sensor and/or circuit
Excessive loadRecommended Repairs
Check for High Ambient Temperature and/or for High Inlet Air Temperature
Determine if the ambient air temperature is within the design specifications for the cooling system.Check for high inlet air temperature. Refer to Troubleshooting, "Intake Manifold Air Temperature Is High".Determine the cause of the high air temperature. Make corrections, when possible.Check for a Low Coolant Level and/or for Coolant Leakage
Note: Low coolant level can be the effect of overheating rather than the cause.Check the coolant level.Run the engine to operating temperature. Inspect the cooling system for leaks.Determine whether the leak occurs before the engine overheats.Add coolant, if necessary. If leaking is found, make the necessary repairs.Check for Insufficient Flow of Air Through the Radiator
Check the fins of the radiator for obstructions. Check the fan for proper operation.If the radiator fins are obstructed, clean the fins. If the fan does not operate properly, make the necessary repairs.Check the Water Temperature Regulator
Check the water temperature regulator for proper operation. Refer to the engine's Systems Operation/Testing and Adjusting manual.Replace the water temperature regulator, if necessary.Check the Coolant Temperature Sensor and/or the Circuit
Check the reading of the coolant temperature on the Caterpillar Electronic Technician (ET). The temperature should rise steadily as the engine is warmed. Ensure that the temperature is reasonable.If the reading on Cat ET for the coolant temperature is not reasonable, troubleshoot the circuit and the coolant temperature sensor. Refer to Troubleshooting, "Sensor Signal (Analog, Passive) - Test".Excessive Load
Make sure that the load is not excessive. Reduce the load, if necessary.