To determine if a faulty pressure control cap is causing high engine coolant temperature, perform
the following:
1. Perform coolant pressure control cap tests; refer to appropriate service manual, cooling
system chapter.
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.
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 13.3.1.1.
13.3.1.1
Test Engine with Replaced Pressure Control Cap
Perform the following to determine if exterior radiator repair 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.
[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.
