2015 Ford F-250 Super Duty Coolant Capacity & Type

The 2015 Ford F-250 Super Duty holds between 22 and 33 quarts (20.8 - 31.2 liters) of coolant, depending on the engine. Properly maintaining your F-250 Super Duty's cooling system is crucial for its longevity and performance, especially when towing or hauling heavy loads.

Quick Answer

• Total Cooling System Capacity:
  • 6.2L V8: Approximately 22 quarts (20.8 liters)
  • 6.7L Power Stroke Diesel: Approximately 33 quarts (31.2 liters)
• OEM Coolant Spec: Ford Orange (Motorcraft Orange Prediluted Antifreeze/Coolant VC-3-B or equivalent), meeting Ford Specification WSS-M97B44-D2. This is an OAT (Organic Acid Technology) coolant.
• Mix Ratio: Typically 50/50 pre-mix, or 50% concentrate / 50% distilled water if mixing yourself.

Capacity by Engine Option

Flush Interval

Ford recommends the following coolant flush intervals for the 2015 F-250 Super Duty using the specified Orange coolant:

• Normal Duty: Initial change at 100,000 miles or 6 years, then every 50,000 miles or 3 years thereafter.
• Severe Duty (e.g., heavy towing, frequent idling, extreme temperatures): It's generally advisable to reduce these intervals. Consider an initial change at 60,000-75,000 miles or 4-5 years, and then every 30,000-40,000 miles or 2-3 years.

Regularly inspect your coolant level and condition, regardless of mileage, and address any signs of contamination or low levels promptly.

How to Refill & Bleed

Refilling and bleeding the cooling system on your 2015 Ford F-250 Super Duty properly is essential to prevent air pockets, which can cause overheating. Always ensure the engine is cool before starting.

1. Drain the System: Locate and open the radiator drain petcock (or remove the lower radiator hose) to drain the old coolant into a suitable container. For a complete flush, you may want to repeatedly flush with distilled water until clear. Dispose of old coolant responsibly.
2. Close Drain and Refill: Close the petcock or reattach the hose. Slowly fill the degas bottle (coolant reservoir) with the appropriate Ford Orange (WSS-M97B44-D2) 50/50 coolant mix.
3. Start Engine and Bleed: Start the engine with the degas bottle cap off. Turn the heater to its highest setting (fan on low). Allow the engine to reach operating temperature. As the engine warms, the thermostat will open, and the coolant level in the degas bottle may drop as trapped air escapes and coolant circulates. Continue to add coolant to maintain the "COLD FILL" line.
4. Burp the System: Gently squeeze the upper and lower radiator hoses several times to help dislodge air bubbles. You may see bubbles rise in the degas bottle.
5. Monitor Level: Once the engine is at operating temperature and no more bubbles are consistently appearing, install the degas bottle cap. Drive the vehicle for a short trip, then allow it to cool completely. Recheck the coolant level and top off if necessary. Repeat the driving and cooling cycle a couple of times to ensure all air is out.

• Specific for 6.7L Power Stroke Diesel: These systems can be particularly sensitive to air. Some technicians prefer using a vacuum fill tool to draw a vacuum on the system before refilling. This method can be very effective at preventing air pockets.

Common Cooling System Issues

Owners of the 2015 Ford F-250 Super Duty, particularly with the 6.7L Power Stroke, might encounter some common cooling system issues:

• Water Pump Leaks: While not exclusively a Super Duty issue, water pump failures and leaks can occur, especially as the vehicle ages. Keep an eye out for coolant puddles under the front of the vehicle.
• Degas Bottle Leaks/Cracks: The plastic degas bottle can develop cracks or leaks over time, leading to coolant loss. Inspect the bottle regularly for signs of stress or seepage.
• Radiator Leaks: Radiator end-tank leaks are possible, particularly with age and exposure to road debris. Look for green or orange crusty residue around the radiator fins or tanks.
• Thermostat Issues: A failing thermostat can cause overheating (if stuck closed) or extended warm-up times (if stuck open). The 6.7L Power Stroke has multiple thermostats, adding complexity.
• EGR Cooler Issues (6.7L Power Stroke): The Exhaust Gas Recirculation (EGR) cooler on the diesel engine is a known potential failure point. Internal leaks in the EGR cooler can lead to coolant loss, white smoke from the exhaust, and even engine damage if not addressed. This is a significant concern for 6.7L owners.
• Hose Leaks: Hoses degrade over time. Check for swollen, cracked, or soft hoses, and replace them if necessary.

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