DD15 Troubleshooting – Section 11.4 Defective Coolant Hoses

Section 11.4
Defective Coolant Hoses

Check as follows:‪

1. Visually examine cooling system hoses; refer to OEM guidelines.
2. Check for soft, deteriorated, or collapsed hoses.
   1. If cooling system hoses are not soft, deteriorated, or collapsed, check the fan belts and tensioner.
   2. If cooling system hoses are soft, deteriorated, or collapsed, remove and replace damaged or worn coolant hoses as necessary; refer to OEM instructions.

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

3. Start and run the engine.
4. Run the engine through its operating range with no-load for approximately 5 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 85-95°C (185-203°F) and no leaks are found, no further troubleshooting is required.
   2. If the engine coolant temperature is 85-95°C (185-203°F) and leaks are found shut down the engine, repair leaks.
   3. If the engine coolant temperature is not 85-95°C (185-203°F) and no leaks are found, shut down the engine. Check fan belts and tensioner.