Section 12.9
High Inlet Air Temperature

To determine if high inlet air temperature is causing lack of power, perform the following:‪

1. Test the radiator fan, fan drive, or fan shroud for proper operation or configuration; refer to OEM guidelines.

   Note: The engine will be torque limited to protect the turbocharger and charge air cooler; (you will receive derate codes 110 and 404, FMI 14). This is normal engine operation for component protection.

2. Examine test results.
   1. If the radiator fan, fan drive, or fan shroud pass OEM test, check high altitude operation; refer to "12.10 High Altitude Operation" .
   2. If the radiator fan, drive or shroud did not operate correctly; refer to "12.9.1 Radiator Fan, Drive and Shroud Replacement" .

Section 12.9.1
Radiator Fan, Drive and Shroud Replacement

Perform the following steps to replace the radiator fan, drive and or shroud:‪

1. Remove and replace the radiator fan, drive and/or shroud; refer to OEM guidelines.
2. Verify replacement; refer to "12.9.1.1 Test the Engine with Radiator Fan, Fan Drive, or Fan Shroud Replacement" .

Section 12.9.1.1
Test the Engine with Radiator Fan, Fan Drive, or Fan Shroud Replacement

Perform the following steps to determine if replaced radiator fan, fan drive, or fan shroud resolved lack of power condition:‪

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.‪

ENGINE EXHAUST ‪
To avoid injury from inhaling engine exhaust, always operate the engine in a well-ventilated area. Engine exhaust is toxic.‪

1. Start and run the engine.
2. Test drive the vehicle to ensure lack of power has been resolved.
   1. If no lack of power occurred during the test drive, no further troubleshooting is required. Shut down the engine.
   2. If lack of power occurred during the test drive, shut down the engine. Check high altitude operation; refer to "12.10 High Altitude Operation" .