HOSE AS 1188138 - Caterpillar

Use this procedure in order to troubleshoot a 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 and the default trip points for these codes. You must access the monitoring system on Caterpillar Electronic Technician (ET) in order to view the current trip points for these codes.
Table 1
Event Code    
Code and Description    Conditions which Generate this Code    System Response    
E007(2) High Aftercooler Temperature Derate     The aftercooler temperature is above the trip point temperature.     The engine will be derated.
The code is logged.    
E008(3) High Aftercooler Temperature Shutdown     The aftercooler temperature is above the trip point temperature.     The engine will shut down. The code is logged.    
E015(2) High Engine Coolant Temperature Derate     The engine coolant temperature is above the trip point temperature.     The engine will be derated.
The code is logged.    
E016(3) High Engine Coolant Temperature Shutdown     The engine coolant temperature is above the trip point temperature.     The engine will shut down. The code is logged.    
E017(1) High Engine Coolant Temperature Warning     The engine coolant temperature is above the trip point temperature.     The code is logged.    
E279(1) High Aftercooler Temperature Warning     The aftercooler temperature is above the trip point temperature.     The code is logged.    Probable Causes
Low coolant level
Quality of coolant
Air in cooling system
Radiator
Coolant leak
Faulty radiator cooling fan (if applicable)
Damaged hoses
Faulty temperature regulator
Faulty jacket water coolant pump
Aftercooler
Load on the systemRecommended Actions
Low Coolant Level
Inspect the coolant level. If necessary, add coolant.Quality of Coolant
Check the quality of the coolant. The coolant should have the following properties:
Color that is similar to new coolant
Odor that is similar to new coolant
Free from contamination
Properties that are recommended by the engine's Operation and Maintenance ManualIf the coolant does not have these properties, drain the system and flush the system. Refill the cooling system according to the engine's Operation and Maintenance Manual.Air in Cooling System
Check for air in the cooling system. Air can enter the cooling system in different ways. The following conditions cause air in the cooling system:
Filling the cooling system incorrectly
Combustion gas leakage into the cooling systemCombustion gas can get into the system through the following conditions: internal cracks, damaged cylinder head and damaged cylinder head gasket.Radiator
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.Coolant Leak
Check the cooling system for leaks.
Inspect the coolant for presence of bubbles.Faulty Engine Cooling Fan (if applicable)
Check for proper operation of the cooling fan.Damaged Hoses
Damaged hoses with leaks can normally be seen. Hoses that have no visual leaks can soften during operation. The soft areas of the hose can become kinked or crushed