INSULATOR-TERMINAL 8T8569 - Caterpillar

Use this procedure in order to troubleshoot a high coolant temperature or use this procedure if the following diagnostic code is active.
Table 1
Diagnostic Code    
Description    Flash Code    Conditions which Generate this Code    System Response    
110-00 High Coolant Temperature Warning     61     The coolant temperature is above the trip point.     The code is active and the code is logged.    Probable Causes
Low coolant level and/or coolant leakage
Insufficient flow of coolant through the engine
Radiator (if equipped)
Faulty radiator cooling fan (if equipped)
Heat exchanger (if equipped)
Faulty pressure relief valve
Faulty temperature regulator
Faulty water pump
Load on the systemRecommended Actions
Check for a Low Coolant Level and/or 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 the Flow of Coolant Through the Engine
During normal operation, check the inlet pressure of the engine coolant and the outlet pressure of the engine coolant.Measure temperatures and pressures at various points in the cooling system in order to identify possible locations of restrictions.If a buildup of deposits restricts the coolant flow, clean the cooling system.If the flow of coolant through the engine is not sufficient, determine the cause of the obstruction. Make necessary repairs.Radiator (if equipped)
Check the cooling fins on the radiator for dirt and/or for debris. Remove the dirt and/or debris.
Check the cooling fins on the radiator for damage. Refer to the Systems Operation/Testing and Adjusting manual for instructions for testing and inspecting the cooling system.
Check the radiator for internal blockage. Check the temperature difference between the inlet and the outlet of the radiator.Faulty Engine Cooling Fan (if equipped)
Check for proper operation of the cooling fan.Check for Insufficient Flow of Air and Coolant Through the Heat Exchanger (if equipped)
Measure the coolant temperature at the inlet for the coolant.Check for sufficient flow and temperature of the cooling water through the heat exchanger. If the flow of cooling water through the heat exchanger is insufficient, determine the location of the obstruction.Faulty Pressure Relief Valve
Check operation of the pressure relief valve and the radiator cap. If necessary, clean the pressure relief valve and/or the radiator cap. Check that the seating surface of the valve is clean and undamaged. If necessary, install new parts.Faulty Temperature Regulator
Check the water temperature regulators for correct operation.Faulty Water Pump
Measure the coolant pressure at the outlet of the water pump. Make sure that the water pump is in good condition. Inspect the impeller vanes at the jacket water pump for damage and/or for erosion. Repair impeller vanes and/or replace the impeller vanes.Load on the system
Check that the engine is not loaded beyond design.