2014 Ford F-250 Super Duty — Coolant Capacity & Type

The 2014 Ford F-250 Super Duty holds between 20.9 quarts (19.8 liters) and 41.1 quarts (38.9 liters) of coolant, depending on whether it is equipped with the 6.2L gas V8 or the 6.7L Power Stroke diesel V8 engine. Because the Super Duty is built for heavy hauling and towing, keeping the cooling system operating at peak performance is vital to preventing catastrophic engine failure.

Quick Answer

• Total Cooling System Capacity: 20.9 quarts (6.2L V8) to 41.1 quarts total (6.7L Power Stroke V8).
• OEM Coolant Spec: Motorcraft Specialty Orange (OAT - Organic Acid Technology), Ford specification WSS-M97B44-D or WSS-M97B44-D2. (Note: Ford’s newer Motorcraft Yellow coolant, WSS-M97B57-A1/A2, is fully backward-compatible and often replaces Orange at the dealership).
• Mix Ratio: 50/50 mixture of coolant and distilled water. Pre-mixed gallons are recommended for convenience, but concentrate can be used if mixed precisely.

Capacity by Engine Option

The 6.7L Power Stroke diesel is unique because it utilizes two separate cooling systems: a primary system for the engine block and a secondary system for the charge air cooler (CAC), EGR cooler, and transmission cooler.

Flush Interval

Ford’s recommended maintenance schedule for the 2014 F-250 Super Duty varies slightly based on how the truck is used:

• Normal Duty: Replace the factory coolant at 100,000 miles or 6 years. After the initial flush, replace it every 50,000 miles or 3 years.
• Severe Duty (Towing, idling, dusty conditions): Test the coolant strength and check the corrosion inhibitor levels every 15,000 miles. Many diesel technicians recommend a flush every 60,000 miles for trucks that see heavy towing to protect the expensive EGR cooler and water pump.

If your 6.7L diesel gives a "Coolant Additive Required" message, you may need to test the coolant with a specialty test strip and add Ford’s VC-12 supplemental coolant additive (SCA), though the Orange OAT coolant generally requires less maintenance than older diesel coolants.

How to Refill & Bleed

Refilling the 6.2L gas engine is relatively straightforward, but the 6.7L Power Stroke requires specific procedures to prevent trapped air, especially in the secondary system.

1. Drain the System: Ensure the engine is completely cold. Locate the petcock on the radiator(s) and drain the old fluid. On the 6.7L, remember there are two separate radiators and two separate degas bottles (reservoirs).
2. Vacuum Fill (Highly Recommended for Diesel): The factory service manual strongly recommends using a vacuum cooling system filler (Airlift tool) for the 6.7L Power Stroke. This pulls a vacuum on the system, checking for leaks, and then sucks the new coolant in without introducing air pockets.
3. Manual Bleed (If vacuum tool is unavailable): Slowly fill the degas bottle(s) to the MAX line. Leave the caps off. Start the engine and turn the cabin heater to the maximum temperature and fan speed.
4. Burp the System: Idle the engine until the thermostat opens (the upper radiator hose will get hot). For the 6.7L secondary system, you must ensure the electric pump circulates fluid to bleed the charge air cooler. Top off the fluid as the level drops.
5. Final Check: Reinstall the reservoir caps, take the truck for a test drive, let it cool completely, and check the levels one last time.

Common Cooling System Issues (2014 Generation)

• Primary Radiator Leaks (6.7L Diesel): The factory radiators on the 2011-2016 6.7L Power Strokes are notorious for leaking at the crimped seams where the aluminum core meets the plastic side tanks. Upgrading to a fully welded all-aluminum radiator is a popular aftermarket fix.
• Primary Water Pump Failure: The primary water pump on the 6.7L engine is known to develop slow weep-hole leaks as the internal seal degrades around the 100,000-mile mark.
• Coolant Hose Quick-Connects: Several factory coolant hoses use plastic quick-connect fittings with internal O-rings. Over time, heat cycles cause the O-rings to flatten and leak, often requiring the replacement of the entire hose assembly.
• Thermostat Failures: The 6.7L uses dual thermostats. If the truck struggles to reach operating temperature or overheats under load, replacing both thermostats is standard procedure.

Cooling system repairs on heavy-duty trucks can be complex and require specialized tools. Find a trusted shop on Repairius.