C9.3 Engines for Caterpillar Built Machines Coolant Temperature Is High Caterpillar

Coolant Temperature Is High

C9.3 Engines for Caterpillar Built Machines [KENR5393]

C9.3 Engines for Caterpillar Built Machines Coolant Contains Fuel

C9.3 Engines for Caterpillar Built Machines Coolant Temperature Is Low

COOLING SYSTEM

C9.3 Engines for Caterpillar Built Machines Coolant Level - Test

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C9.3 Engines for Caterpillar Built Machines Coolant Contains Fuel

C9.3 Engines for Caterpillar Built Machines Coolant Temperature Is High

C9.3 Engines for Caterpillar Built Machines Coolant Temperature Is Low

C9.3 Engines for Caterpillar Built Machines Oil Contains Coolant

Use this procedure in order to troubleshoot high coolant temperature or use this procedure if one of the following event codes is active. Refer to Troubleshooting, "Event Codes" for information about event codes. Access the monitoring system on AVSpare Electronic Technician (ET) in order to view the current trip points for these codes.

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Table 1
Event Code
CDL Code	Code Description	Comments
E361(1)	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.
E361(2)	High Engine Coolant Temperature High - Moderate Severity (2)	The engine coolant temperature has exceeded the trip point and the delay time has expired. Engine power is derated. The code is logged.
E361(3)	Engine Coolant Temperature High - Most Severe (3)

Probable Causes

Low Coolant Level and/or Coolant Leakage
Coolant Temperature Sensor
Water Temperature Regulator and/or Pressure Relief Valve
Radiator
Engine Cooling Fan (if equipped)
Coolant Pump
Cylinder Head Gasket

Recommended Actions

Note: The procedures have been listed in order of probability. Complete the procedures in order.

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Table 2
Troubleshooting Test Steps	Values	Results
1. Inspect the Coolant Level	Coolant Level	Result: The coolant level is low. Repair: Add coolant to the cooling system.
2. Check the Cooling System for Leaks	Leaks	Result: There are leaks in the cooling system. Repair: Repair or replace the parts that are leaking. Result: There are no leaks in the cooling system. Proceed to Test Step 3
3. Check the Coolant Temperature Sensor 1. 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. Refer to Troubleshooting, "Sensor Signal (Analog, Passive) - Test".	Coolant Temperature Sensor	Result: The coolant temperature sensor reading is not reasonable. Repair: Repair or replace the coolant temperature sensor. Result: The coolant temperature sensor reading is reasonable. Proceed to Test Step 4.
4. Pressure Test the Cooling System A. 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.	Pressure Test	Result: The pressure test results are NOT OK. Repair: If necessary, clean the components and/or replace the components. Result: The pressure test results are OK. Proceed to Test Step 5.
5. Check the Radiator A. Check the radiator fins for dirt, debris, and/or damage. B. Check the radiator for internal blockage. C. Ensure that the radiator size is according to the OEM specifications. 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 is NOT OK. Repair: Repair or replace the radiator. Result: The radiator is OK. Proceed to Test Step 6.
6. Check the Engine Cooling Fan A. If the fan is belt driven, check for loose drive belts. A loose fan drive belt will cause a reduction in the air flow across the radiator. Check the fan drive belt for proper belt tension. B. Check the fan clutch, if equipped. A fan clutch or a hydraulic driven fan that is not turning at the correct speed can cause improper air speed across the radiator core. The lack of proper air flow across the radiator core can cause the coolant not to cool to the proper temperature differential. Refer to Troubleshooting, "Cooling Fan Control - Test" for troubleshooting information.	Engine Cooling Fan	Result: The engine cooling fan is NOT OK. Repair: Repair or replace the engine cooling fan. Result: The engine cooling fan is OK. Proceed to Test Step 7.
7. Inspect the Water Pump A. Inspect the impeller of the water pump for damage and/or erosion. B. Make sure that the drive gear is not loose on the drive shaft of the water pump.	Water Pump	(Result:) The water pump is NOT OK. Repair: Repair or replace the water pump. Refer to Disassembly and Assembly for the correct procedure. Result: The water pump is OK. . Proceed to Test Step 8.
8. Inspect the Cylinder Head Gasket A. Remove the cylinder head. Refer to the Disassembly and Assembly manual. B. Check the cylinder liner projection. Refer to the Systems Operation/Testing and Adjusting manual. C. Pressure test the head for leaks. Refer to the Systems Operation/Testing and Adjusting manual for testing procedures.	Cylinder Head Gasket	Result: The cylinder head gasket is NOT OK. Repair: Install a new cylinder head gasket and new water seals in the spacer plate. Refer to the Disassembly and Assembly manual.