Inoperative Thermo-Modulated Fan
To determine if an inoperative thermo-modulated fan is causing high engine coolant temperature, test the thermo-modulated fan. Refer to OEM guidelines.
- If the thermo-modulated fan is functioning correctly, check thermostats; refer to "14.7 Faulty Thermostats" .
- If the thermo-modulated fan is not functioning correctly, refer to "14.6.1 Thermo-Modulated Fan Replacement" .
Thermo-Modulated Fan Replacement
Perform the following steps to replace inoperative thermo-modulated fan:
- Replace inoperative thermo-modulated fan; refer to OEM guidelines.
- Verify thermo-modulated fan replacement; refer to "126.96.36.199 Test Engine with Replaced Thermo-Modulated Fan" .
Test Engine with Replaced Thermo-Modulated Fan
Perform the following steps to determine if thermo-modulated fan replacement resolved high engine coolant temperature:
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.
- Start and run the engine.
- Run the engine through its operating range with no-load for approximately five minutes, allowing the engine coolant to reach normal operating range.
- If the engine coolant temperature is 70-95°C (158-203°F), no further troubleshooting is required. Shut down the engine.
- If the engine coolant temperature is not 70-95°C (158-203°F), shut down the engine. Check thermostats; refer to "14.7 Faulty Thermostats" .
|EPA07 MBE 900 DDEC VI Troubleshooting Guide - 6SE580|
|Generated on 10-13-2008|