Section 14.4 Defective Coolant Hoses

Section 14.4
Defective Coolant Hoses

To determine if defective coolant hoses are causing high engine coolant temperature, visually examine cooling system hoses; refer to OEM guidelines.‪

  1. If cooling system hoses are not soft, deteriorated, collapsed, or have leaking connections, check the fan belts; refer to "14.5 Incorrectly Adjusted Fan Belt" .
  2. If cooling system hoses are soft, deteriorated, collapsed, or have leaking connections, refer to "14.4.1 Coolant System Hoses Replacement" .

Section 14.4.1
Coolant System Hoses Replacement

Perform the following steps to resolve worn or damaged coolant system hoses:‪

  1. Remove and replace damaged or worn coolant hoses as necessary; refer to OEM guidelines.
  2. Install new coolant hoses as necessary; refer to OEM guidelines.
  3. Verify replaced coolant system hoses; refer to "14.4.1.1 Test Engine with Replaced Coolant Hoses" .
Section 14.4.1.1
Test Engine with Replaced Coolant Hoses

Perform the following to determine if the new coolant hoses resolved high engine coolant temperature:‪

warning

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, and visually examine replaced hoses for any leaks.
    1. If the engine coolant temperature is 82-105°C (180-221°F) and no leaks are found, no further troubleshooting is required.
    2. If the engine coolant temperature is 82-105°C (180-221°F) and leaks are found, repair the leaks; refer to "14.4.1 Coolant System Hoses Replacement" . Shut down the engine.
    3. If the engine coolant temperature is not 82-105°C (180-221°F) and no leaks are found, shut down the engine. Check fan belt; refer to "14.5 Incorrectly Adjusted Fan Belt" .


EPA07 MBE 4000 DDEC VI Troubleshooting Guide - 6SE568
Generated on 10-13-2008

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