Maintenance - Section 40 OM4052 Page 40-2 Lubrication and Service COOLING SYSTEM Antifreeze Temperature Recommendations Coolant Level Check Check the coolant sight gauge. If the coolant cannot be seen in the sight gauge, add coolant to the cooling sys- tem before operating the truck. Refer to the following section for the proper filling procedure. Radiator Filling Procedure The engine coolant must be visible in the sight gauge before operating the truck. After operating the truck, the cooling system will be pressurized due to the thermal expansion of coolant. DO NOT remove the radiator cap while the engine and cool- ant are hot. Severe burns may result. 1.
With the engine and coolant at ambient tempera- ture, press the pressure relief button to release any remaining pressure, and remove the radiator cap. NOTE: If the coolant is added using the Wiggins quick fill system, the radiator cap must be removed prior to adding the coolant. 2. Fill the radiator with the proper coolant mixture, as specified by the engine manufacturer, until the coolant is visible in the sight gauge. 3. Install the radiator cap. 4. Start the engine. Allow the engine to idle for five minutes. Check the coolant level at the sight gauge. 5. If the coolant is not visible in the sight gauge, repeat the procedure.
Any excess coolant will be discharged through a vent hose after the engine reaches normal operating temperature. COOLING SYSTEM ANTIFREEZE RECOMMENDATIONS (Ethlyene Glycol Permanent Type Antifreeze) Percentage of Antifreeze Protection To 10 - 5°C +23°F 20 - 9°C +16°F 25 - 11°C +11°F 30 - 16°C +4°F 35 - 19°C - 3°F 40 - 24°C - 12°F 45 - 30°C - 23°F 50 - 36°C - 34°F 55 - 44°C - 48°F 60 - 52°C - 62°F Use only antifreeze that is compatible with the engine, as specified by the engine manufacturer.