MBE 4000 DDEC VI Troubleshooting – Section 14.2 Insufficient Radiator Air Circulation

Section 14.2
Insufficient Radiator Air Circulation

To determine if insufficient radiator air circulation is causing high engine coolant temperature, visually examine the radiator and radiator shrouding.‪

1. If the radiator is absent of clogging, debris, and dirt, check the pressure control cap; refer to "14.3 Faulty Pressure Control Cap" .
2. If the radiator has excessive clogging, debris, or dirt, refer to "14.2.1 Exterior Radiator Repair" .
3. If the radiator shrouding is not damaged, incorrectly positioned, or inadequate, check the pressure control cap; refer to "14.3 Faulty Pressure Control Cap" .
4. If the radiator shrouding is damaged, incorrectly positioned, or inadequate, refer to "14.2.2 Radiator Shroud Repair" .

Section 14.2.1
Exterior Radiator Repair

Perform the following for exterior radiator repair:‪

1. Clean the exterior radiator of all clogging, debris, or excessive dirt; refer to OEM guidelines.
2. Verify exterior radiator repair; refer to "14.2.2.1 Test Engine with Repaired Exterior Radiator and Shrouding" .

Section 14.2.2
Radiator Shroud Repair

Perform the following for radiator shroud repair:‪

1. Repair or replace damaged radiator shrouding; refer to OEM guidelines.
2. Verify exterior radiator repair; refer to "14.2.2.1 Test Engine with Repaired Exterior Radiator and Shrouding" .

Section 14.2.2.1
Test Engine with Repaired Exterior Radiator and Shrouding

Perform the following to determine if exterior radiator and shrouding repair resolved high engine coolant temperature:‪

PERSONAL INJURY ‪
To avoid injury before starting and running the engine, ensure the vehicle is parked on a level surface, parking brake is set, and the wheels are blocked.‪

1. Start and run the engine.
2. Run the engine through its operating range with no-load for approximately five minutes, allowing the engine coolant to reach normal operating range.
   1. If the engine coolant temperature is 82-105°C (180-221°F), no further troubleshooting is required. Shut down the engine.
   2. If the engine coolant temperature is not 82-105°C (180-221°F), shut down the engine. Check the pressure control cap; refer to "14.3 Faulty Pressure Control Cap" .