ELECTRONICS GP-ENGINE 4561345 - Caterpillar

Probable Causes
Diagnostic codes
Coolant level
Coolant temperature sensor
Radiator and hoses
Radiator cap and pressure relief valve
Water temperature regulator
Engine cooling fan (if equipped)
Coolant quality
Coolant pump
Cylinder head gasketRecommended Actions
Note: The procedures have been listed in order of probability. Complete the procedures in order.
Table 2
Troubleshooting Test Steps    Values    Results    
1. Diagnostic Codes
A. Use the electronic service tool to check for diagnostic codes that relate to the temperature in the cooling system.
   
Diagnostic Codes    
Result: Diagnostic codes are not present.
Return the unit to service.
Result: Diagnostic codes are present.
Proceed to Test Step 2.    
2. Coolant Level
A. Check the coolant level.
   
Engine coolant level
   
Result: The engine coolant level is low.
Check the cooling system for leaks. Refer to Troubleshooting, "Coolant Level is Low" for additional information. Repair any leaks immediately.
Result: The engine coolant level is OK.
Proceed to Test Step 3.    
3. Coolant Temperature Sensor
A. Compare the reading for the coolant temperature on the electronic service tool to the reading for the coolant temperature on a calibrated test gauge.
   
Coolant temperature sensor
   
Result: The temperature sensor is not accurate.
Troubleshoot the circuit and the coolant temperature sensor. Refer to Troubleshooting, "Sensor Signal (Analog, Passive) - Test".
Result: The temperature sensor is reading accurately.
For engines with radiator cooling, proceed to Test Step 4.
For engines with keel cooling, proceed to Test Step 5.
For engines with raw water cooling, proceed to Test Step 6.
   
4. Radiator and Hoses
Note: This Test Step is only applicable to engines with radiator cooling.
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.
   
Radiator and hoses
   
Result: The radiator fins are blocked or damaged.
Remove any dirt and/or debris and straighten any bent fins.
Result: The radiator has internal blockage.
Remove the blockage.
Result: The radiator fins are not damaged and the radiator does not have an internal blockage.
Proceed to Test Step 7.
   
5. Keel Cooling System and Hoses
Note: This Test Step is only applicable to engines with keel cooling.
A. Check the cooling system for dirt, debris, and/or damage.
B. Check for collapsed hoses and/or other restrictions.
C. Check that the auxiliary water pump