2025 Ford F-250 Super Duty Coolant Capacity & Type

The 2025 Ford F-250 Super Duty holds approximately 20-24 quarts (18.9-22.7 liters) of coolant, depending on the engine configuration. Maintaining the correct coolant type and level is crucial for the longevity and performance of your Super Duty's engine.

Quick answer

• Total Cooling System Capacity: 20-24 quarts (18.9-22.7 liters)
• OEM Coolant Spec: Ford Yellow Prediluted Antifreeze/Coolant 50/50 P-OAT (Phosphated Organic Acid Technology), Ford Specification WSS-M97B57-A2
• Mix Ratio: 50/50 (pre-mixed or 50% concentrate + 50% distilled water)

Capacity by engine option

While exact figures can vary slightly based on specific options and coolers, here are the approximate capacities for the 2025 Ford F-250 Super Duty engine choices:

Always consult your owner's manual for the most precise capacity information for your specific vehicle configuration.

Flush interval

Ford recommends the first coolant flush for the 2025 F-250 Super Duty at 105,000 miles or 7 years, whichever comes first. Subsequent flushes are recommended every 45,000 miles or 3 years.

For vehicles operating under severe duty conditions—such as frequent towing/hauling, extreme temperatures, or dusty environments—it is advisable to shorten these intervals. Consider performing a flush every 60,000 miles or 4 years for severe duty applications.

How to refill & bleed

Refilling and bleeding the cooling system properly after a drain and flush is critical to prevent air pockets, which can lead to overheating. Here's a general procedure:

1. Drain the system: With the engine cool, place a large drain pan under the radiator. Open the radiator drain cock (petcock) and remove the radiator cap to allow the system to drain completely. For a full flush, you may want to run distilled water through the system until it runs clear.
2. Close drain and fill: Close the radiator drain cock. Begin to slowly fill the degas bottle (coolant reservoir) with the specified Ford Yellow Prediluted Antifreeze/Coolant 50/50 (meeting WSS-M97B57-A2). Fill to the MAX fill line.
3. Bleeding Procedure:
   • Start the engine and set the heater to its highest setting with the fan on low (this opens the heater core valve). Do not blast the AC.
   • Allow the engine to reach operating temperature. As the thermostat opens, the coolant level in the degas bottle may drop. Add more coolant as needed to maintain the level between the MIN and MAX marks.
   • Diesel Engines: Diesel engines, especially the Power Stroke, can be more susceptible to air pockets. Some technicians prefer to use a vacuum fill tool to ensure all air is removed during the initial fill. If not using a vacuum fill, closely monitor the coolant level and system operation for the first few drive cycles.
   • Gently squeeze the upper and lower radiator hoses to help dislodge air bubbles.
   • Monitor the temperature gauge closely. Ensure the heater is blowing hot air, indicating proper coolant circulation through the heater core.
   • Once the engine is at operating temperature and the fan cycles on and off, install the degas bottle cap.
4. Final Check: After the engine has cooled completely, recheck the coolant level in the degas bottle and top off if necessary. Monitor the coolant level over the next few days.

Common cooling system issues

While the 2025 Ford F-250 Super Duty is a robust truck, certain cooling system components can be susceptible to issues over time, particularly for earlier generations of the Super Duty. While the 2025 model aims for improvements, it's wise to be aware of areas that have historically required attention:

• Water Pump Leaks: Like many vehicles, the water pump is a wear item. Seals can degrade over time, leading to leaks. Keeping an eye on the ground under the front of your truck for coolant drips is a good practice.
• Radiator Leaks: Radiators can develop leaks from corrosion, road debris, or fatigue, especially around the plastic end tanks commonly found on modern radiators. White or colored residue around the radiator fins or tanks can indicate a leak.
• Thermostat Failure: A failing thermostat can cause the engine to either overheat (stuck closed) or run too cool (stuck open). Symptoms include fluctuating temperature gauges or a heater that doesn't blow hot heir consistently.
• Hose Leaks/Failures: Radiator hoses and heater hoses can harden, crack, or swell over time, leading to leaks. Inspect hoses regularly for any signs of wear.
• Degas Bottle/Coolant Reservoir Issues: The plastic degas bottle can sometimes crack or suffer cap sealing issues, leading to coolant loss. Always ensure the cap is tightened correctly.
• Power Stroke Diesel Specific Issues (6.7L): Diesel engines operate under higher pressures and temperatures. Issues with EGR (Exhaust Gas Recirculation) coolers causing coolant consumption have been noted in past Power Stroke generations, though newer designs aim to mitigate this.

Regular maintenance, including adhering to recommended coolant flush intervals and inspecting components during oil changes, will significantly extend the life of your cooling system.

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