2019 Ford F-350 Super Duty Coolant Capacity & Type

The 2019 Ford F-350 Super Duty's cooling system holds approximately 21.7 to 24.5 quarts (20.5 to 23.2 liters) of coolant, depending on the engine.

Quick Answer

• Total Cooling System Capacity:
  • 6.2L V8: Approximately 21.7 quarts (20.5 liters)
  • 6.7L Power Stroke Diesel: Approximately 24.5 quarts (23.2 liters)
• OEM Coolant Spec: Orange / Yellow, P-OAT (Phosphated Organic Acid Technology), Ford Specification WSS-M97B51-A1 (Motorcraft Orange coolant or equivalent)
• Mix Ratio: 50/50 prediluted coolant or 50% concentrate with 50% distilled water

Capacity by Engine Option

Flush Interval

Ford recommends the following coolant flush intervals for the 2019 F-350 Super Duty:

• Normal Duty: Initial change at 100,000 miles (160,000 km) or 6 years, then every 50,000 miles (80,000 km) or 3 years thereafter.
• Severe Duty (e.g., heavy towing, off-road use, extreme climates): Initial change at 60,000 miles (96,000 km) or 3 years, then every 30,000 miles (48,000 km) or 2 years thereafter.

Adhering to these intervals helps maintain the integrity of the cooling system and prevents premature wear of components.

How to Refill & Bleed

Properly refilling and bleeding the cooling system is crucial to prevent air pockets that can cause overheating. For the 2019 Ford F-350 Super Duty, the process generally involves:

1. Drain the system: With the engine cool, open the radiator draincock and remove the radiator cap to allow the system to drain completely. For a full flush, you may need to repeatedly fill with distilled water and drain until the water runs clear.
2. Close draincock: Once drained, close the radiator draincock securely.
3. Refill: Slowly pour the specified 50/50 coolant mixture into the degas bottle (coolant reservoir) until it reaches the MAX fill line. For diesel models, ensure both degas bottles (primary and secondary) are filled.
4. Idle and bleed: Start the engine with the heater on full hot and the fan low (to open the heater core valve). Allow the engine to idle. As the engine warms up, the thermostat will open, and coolant will begin to circulate. This allows trapped air to rise into the degas bottle.
5. Monitor coolant level: As the engine idles and circulates coolant, the level in the degas bottle may drop. Continue to top off the coolant to the MAX line as needed until the level stabilizes and no more air bubbles appear.
6. Test drive and recheck: Once the engine is fully warmed up and no more air is escaping, take the vehicle for a short test drive. After the engine has cooled completely, recheck the coolant level in the degas bottle and top off if necessary.

Specific Notes: The 6.7L Power Stroke diesel engine has a complex cooling system with separate primary and secondary cooling loops. Ensure both systems are properly filled and bled. While a specialized vacuum fill tool isn't strictly required, it can significantly expedite and improve the efficiency of air removal, especially for the 6.7L Power Stroke.

Common Cooling System Issues for This Generation

Owners of the 2019 Ford F-350 Super Duty may encounter some common cooling system issues:

• Degas Bottle Cracking: A recurring issue, particularly with the 6.7L Power Stroke, is the degas bottle (coolant reservoir) developing cracks and leading to coolant leaks. Regularly inspect the bottle for hairline cracks, especially around seams and hose connections.
• Coolant Leaks: Beyond the degas bottle, other common leak points can include hoses, the water pump (especially on higher mileage vehicles), radiator, and heater core.
• Thermostat Issues: A failing thermostat can cause the engine to run too hot or too cold, leading to poor performance and potential damage. Symptoms include erratic temperature gauge readings or the engine taking a long time to warm up.
• Radiator Problems: Over time, radiators can become clogged internally or develop external fin damage, reducing their cooling efficiency. Leaks can also occur at the plastic end tanks.
• EGR Cooler Issues (6.7L Power Stroke Diesel): The EGR (Exhaust Gas Recirculation) cooler on the 6.7L Power Stroke can be a source of coolant leaks into the exhaust system, often indicated by a sweet smell from the exhaust or white smoke. This is a more serious issue requiring professional diagnosis and repair.
• Coolant Contamination: Mixing incompatible coolants can lead to gelling, corrosion, and reduced cooling system effectiveness. Always use the specified P-OAT coolant.

Regular maintenance and prompt attention to any signs of cooling system trouble are essential for the longevity of your F-350 Super Duty.

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