To determine if defective coolant hoses is causing high engine coolant temperature, perform
the following:
1. Visually examine cooling system hoses; refer to OEM guidelines.
2. Check for soft, deteriorated, or collapsed hoses.
[a] If cooling system hoses are not soft, deteriorated, or collapsed, check the fan belts;
refer to section 13.5.
[b] If cooling system hoses are soft, deteriorated, or collapsed, refer to section 13.4.1.
13.4.1
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 section 13.4.1.1.
13.4.1.1
Test Engine with Replaced Coolant Hoses
Perform the following to determine if the new coolant hoses resolved high engine coolant
temperature:
1. Start and run the engine.
2. 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.
[a] If the engine coolant temperature is 88-96°C (190-210°F) and no leaks are found,
no further troubleshooting is required.
[b] If the engine coolant temperature is 88-96°C (190-210°F) and leaks are found shut
down the engine, repair leaks; refer to section 13.4.1.
[c] If the engine coolant temperature is not 88-96°C (190-210°F) and no leaks are found,
shut down the engine. Check fan belts; refer to section 13.5.
