To determine if a faulty pressure control cap is causing high engine coolant temperature, perform
1. Perform coolant pressure control cap tests; refer to appropriate service manual, cooling
2. Check the test results.
[a] If the cooling system pressure is less than or equal to 48.3 kPa (7 psi), check the
coolant hoses; refer to section 13.4.
[b] If the cooling system pressure is greater than 48.3 kPa (7 psi), refer to section 13.3.1.
Pressure Control Cap Resolution
Perform the following steps to resolve faulty pressure control cap:
1. Remove and replace pressure control cap; refer to OEM guidelines.
2. Install a new pressure control cap; refer to OEM guidelines.
3. Verify pressure control repair; refer to section 126.96.36.199.
Test Engine with Replaced Pressure Control Cap
Perform the following to determine if exterior radiator repair resolved high engine coolant
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.
[a] If the engine coolant temperature is normal, no further troubleshooting is required. Shut down the engine.
[b] If the engine coolant temperature is not normal, shut down the engine. Check coolant hoses; refer to section 13.4.