3176C Engine for the R1600G and the R1700G Load Haul Dumps Coolant Temperature Is High Caterpillar


Coolant Temperature Is High
`
1.1. Probable Causes
2.1. Recommended Actions
3.2. Coolant
4.2. Water Temperature Regulator and/or Pressure Relief Valve
5.2. Radiator or Heat Exchanger
6.3. Radiator
7.3. Heat Exchanger
8.2. Faulty Engine Cooling Fan (if equipped)
9.2. Coolant Pump
10.2. Check the Coolant Temperature Sensor and/or the Circuit

Use this procedure in order to troubleshoot high coolant temperature. You must access the monitoring system on AVSpare Electronic Technician (ET) in order to view the current trip points for these codes.

Probable Causes

  • Low coolant level and/or coolant leakage

  • Water temperature regulator and/or pressure relief valve

  • Radiator or heat exchanger

  • Engine cooling fan (if equipped)

  • Coolant pump

  • Coolant temperature sensor

Recommended Actions

Coolant

  1. Inspect the coolant level. If necessary, add coolant.

  1. Check for the correct mixture of antifreeze and water. Refer to Operation and Maintenance Manual.

  1. Check the cooling system for leaks. Repair any leaks immediately.

  1. Check for air in the cooling system. Refer to Systems Operation/Testing and Adjusting for the correct procedure.

Water Temperature Regulator and/or Pressure Relief Valve

  1. Pressure test the cooling system. Refer to Systems Operation/Testing and Adjusting for the correct procedure.

  1. Check that the seating surfaces of the pressure relief valve and the radiator cap are clean and undamaged.

  1. Check operation of the pressure relief valve and/or the water temperature regulator. If necessary, clean the components and/or replace the components.

Radiator or Heat Exchanger

Radiator

  1. Check the radiator fins for dirt, debris, and/or damage. Remove any dirt and/or debris and straighten any bent fins. Check for collapsed hoses and/or other restrictions.

  1. Check the radiator for internal blockage. Refer to Systems Operation/Testing and Adjusting for more information.

Heat Exchanger

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. If the temperature of the cooling water is too high, determine the cause. Make the necessary repairs.

Faulty Engine Cooling Fan (if equipped)

  1. 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. Adjust the tension of the fan drive belt, if necessary. Refer to Operation and Maintenance Manual.

  1. 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.

Coolant Pump

  1. Inspect the impeller of the coolant pump for damage and/or erosion.

  1. Make sure that the drive gear is not loose on the drive shaft of the coolant pump.

  1. If necessary, replace the coolant pump. Refer to Disassembly and Assembly for the correct procedure.

Check the Coolant Temperature Sensor and/or the Circuit

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.

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, Active) - Test".

Information System:

CP76 and CS76 Vibratory Compactors Propel System Pump Control (Manual Displacement Control) Neutral (Drum Propel) - Test and Adjust
3176C Engine for the R1600G and the R1700G Load Haul Dumps Acceleration Is Poor or Throttle Response Is Poor
CAESultra v3.2 Software Installation{7604, 7620}
938H Wheel Loader and IT38H Integrated Toolcarrier Hydraulic System Pilot Oil Accumulator (Dead Engine, Lift Arm Lower) - Test and Charge
3176C Engine for Caterpillar Built Machines Electronic Service Tool Does Not Communicate
3176C Engine for Caterpillar Built Machines ECM - Replace
CP76 and CS76 Vibratory Compactors Propel System Piston Pump Neutral (Axle Propel Pump) - Adjust
14M and 16M Motor Graders Machine Systems General Information - Autolube System, If Equipped
CP76 and CS76 Vibratory Compactors Propel System Piston Pump Neutral (Drum Propel Pump) - Adjust
14M Motor Grader Operator Controls
140M and 150 Motor Graders Engine Supplement Aftercooler - Remove
140H and 160H Motor Graders Maintenance Interval Schedule
Supplemental Parts Information for the USN Seabee AP655C{1000, 7000}
CS56, CS64, CS74, CS76, CP56, CP64, CP74 and CP76 Vibratory Soil Compactors Engine and Machine Warm-Up
3176C, 3406E and 3456 Industrial Engines Engine Cranks but Does Not Start
CP76 and CS76 Vibratory Compactors Propel System Pump Control (Manual Displacement Control) Neutral (Axle Propel) - Test and Adjust
3176C Engine for the R1600G and the R1700G Load Haul Dumps Engine Misfires, Runs Rough or Is Unstable
CP76 and CS76 Vibratory Compactors Propel System Neutral Start Switch - Test and Adjust
3176C, 3406E and 3456 Industrial Engines Engine Shutdown Is Intermittent
3176C Engine for the R1600G and the R1700G Load Haul Dumps Engine Top Speed Is Not Obtained
140M and 150 Motor Graders Engine Supplement Aftercooler - Install
R1600G Load Haul Dump Braking System Brake Disc Wear - Check
R1600G Load Haul Dump Braking System Parking Brake - Manual Release
R1600G Load Haul Dump Machine Systems Steering Cylinder - Remove