BELT-SERPENTINE 1420861 - Caterpillar

Use this procedure in order to troubleshoot high coolant temperature. Also, use this procedure if one of the following diagnostic codes is active.
Table 1
Diagnostic Codes Table
J1939 Code and Description Conditions which Generate this Code System Response
110-15
Engine Coolant Temperature : High - least severe (1) The engine coolant temperature has exceeded the trip point and the delay time has expired. The code is logged.
The ECM may derate the engine or shutdown the engine.
110-16
Engine Coolant Temperature : High - moderate severity (2)
110-0
Engine Coolant Temperature : High - most severe (3) Probable Causes
Coolant and/or coolant leakage
Coolant temperature sensor
Water temperature regulator and/or pressure relief valve
Radiator
Heat exchanger
Engine cooling fan (if equipped)
Coolant pump
Cylinder head gasketRecommended Actions
Note: The procedures have been listed in order of probability. Complete the procedures in the order of the listed test steps.
Table 2
Troubleshooting Test Steps Values Results
1. Check the Engine Coolant Level.
Engine Coolant Level
Result: The engine coolant level is OK.
Proceed to Test Step 2.
Result: The engine coolant level is NOT OK.
Repair: Check the cooling system for leaks. Refer to Troubleshooting, "Coolant Level is Low" for additional information. Repair any leaks immediately.
Check for air in the cooling system. Refer to Systems Operation/Testing and Adjusting, "Cooling System" for the correct procedure.
Verify that the repair eliminated the problem.
2. Coolant Temperature Sensor and/or the Circuit
A. Check the reading of the coolant temperature on Cat ET. The temperature should rise steadily as the engine is warmed. Ensure that the temperature is reasonable.
Coolant Temperature Sensor
Result: The temperature sensor is working properly.
Proceed to Test Step 3.
Result: The temperature sensor is not working properly.
Repair: Troubleshoot the circuit and the coolant temperature sensor. Refer to Troubleshooting, "Sensor Signal (Analog, Passive) - Test".
Verify that the repair eliminated the problem.
3. Water Temperature Regulator and/or Pressure Relief Valve
A. Pressure-test the cooling system. Refer to Systems Operation/Testing and Adjusting for the correct procedure.
B. Check that the seating surfaces of the pressure relief valve and the radiator cap are clean and undamaged.
C. Check operation of the pressure relief valve and/or the water temperature regulator.
Temperature Regulator
Result: The pressure relief valve and/or the water temperature regulator are operating properly.
Proceed to Test Step 4.
Result: The pressure relief valve and/or the water temperature regulator are not operating properly.
Repair: Clean the components and/or replace the components.
Verify that the repair eliminated the problem.
4. Radiator
A. Check the radiator fins for dirt, debris, and/or damage.
B. Check for collapsed hoses and/or other restrictions.
C. Check the radiator for internal blockage.
Ensure that the radiator size is sufficient. An undersized radiator does not have enough area for the effective release of heat. An undersized radiator may cause the engine to run at a temperature that is higher than normal. The normal temperature is dependent on the ambient temperature.
Radiator
Result: The radiator fins are not damaged and the radiator does not have an internal blockage.
Proceed to Test Step 5.
Result: The radiator fins are damaged.
Repair: Remove any dirt and/or debris and straighten any bent fins.
Result: The radiator has internal blockage.
Repair: Remove the blockage.
Verify that the repair eliminated the problem.
5. Heat Exchanger
A. Check for sufficient flow and temperature of the