Section 27.1 Improper Engine Coolant Level

Section 27.1
Improper Engine Coolant Level

To determine if improper engine coolant level is causing high engine coolant temperature, perform the following:‪

1. Visually inspect the radiator coolant level; refer to OEM guidelines.
   1. If the radiator coolant level is within 2.0 in. (approximately 0.50 mm) of the radiator filler neck, check insufficient radiator air circulation; refer to "27.2 Insufficient Radiator Air Circulation" .
   2. If the radiator coolant level is not within 2.0 in. of the radiator filler neck, refer to "27.1.1 Improper Coolant Level Resolution" .

Section 27.1.1
Improper Coolant Level Resolution

Perform the following steps to resolve improper coolant level:‪

1. Fill coolant system to correct level; refer to "13.5.4 Cooling System" .
2. Verify coolant level resolution; refer to "27.1.1.1 Test Engine with Proper Coolant Level" .

Section 27.1.1.1
Test Engine with Proper Coolant Level

Perform the following to determine if proper coolant level 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.
   1. If the engine coolant temperature is 88-96°C (190-210°F), no further troubleshooting is required.
   2. If the engine coolant temperature is not 88-96°C (190-210°F), check for insufficient radiator air circulation; refer to "27.2 Insufficient Radiator Air Circulation" .