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2015 Ford Explorer Coolant Type & Capacity
2015 Explorer engine coolant specifications, capacity differences, service intervals and overheating warning signs.
Confirm the vehicle's engine, trim, drivetrain, market and equipment. The exact procedure may differ, even within the same model year.
2015 Ford Explorer reference
| Engine | Total system capacity |
|---|---|
| 3.5L naturally aspirated V6 | 12.2 US qt / 11.5 L |
| 3.5L EcoBoost V6 | 11.4 US qt / 10.8 L |
| 2.0L EcoBoost | 11.6 US qt / 11.0 L |
| Original manual coolant specification | Ford WSS-M97B44-D2 |
| Initial service interval | 6 years or 100,000 mi / 160,000 km |
System fill figures are approximate published TOTAL capacities, not a promised drain-and-fill amount. Confirm current Ford-approved replacement coolant.
Use the correct coolant specification
The September 2014 Ford Explorer manual specifies Motorcraft Orange Antifreeze/Coolant meeting Ford WSS-M97B44-D2 for the three listed engines. Colour alone is not a reliable compatibility test. Modern replacement products may use different dyes or later Ford service recommendations; verify current compatibility against the VIN and Ford specifications before topping off or flushing.
Cooling system capacity varies by engine
The published total system capacities are 12.2 US qt (11.5 L) for the 3.5L naturally aspirated V6, 11.4 US qt (10.8 L) for the 3.5L EcoBoost and 11.6 US qt (11.0 L) for the 2.0L EcoBoost. Total system capacity is not the amount that will necessarily drain during a routine service. Air trapped during refilling can also cause trouble if the correct bleeding procedure is ignored.
When coolant is due
Ford lists the initial coolant change at six years or 100,000 miles (160,000 km), whichever occurs first, followed by every three years or 50,000 miles (80,000 km) under its published normal schedule. As of 2026, the initial time-based interval has passed for any vehicle still running on its original coolant, regardless of low mileage.
How to check level safely
Check the translucent coolant reservoir on level ground with the engine completely cold, following the markings and procedure in the owner’s manual. Never remove a hot pressurized cap. If level repeatedly falls, investigate rather than continually topping up. A failing hose, radiator, cap, heater core or water pump may be responsible.
Watch for internal leaks on the 3.5L V6
The naturally aspirated 3.5L V6 uses an internal timing-chain-driven water pump. An internal leak may allow coolant contamination of engine oil and can lead to major damage. Unexplained coolant loss, oil that looks contaminated, overheating and unusual engine noises need prompt qualified inspection. The water pump article provides the detailed symptoms and decision points.
What if the temperature warning appears?
If the temperature gauge or warning indicates overheating, turn off unnecessary loads and find a safe place to stop, following Ford’s emergency instructions. Never continue driving a severely overheated engine or open a hot cooling system. Steam, coolant spray or a sudden loss of heat from the cabin warrants extra caution.
Before a coolant service
Confirm coolant chemistry and whether the vehicle already received a different approved service fill. Use the correct flushing and bleeding procedure for the engine; avoid mixing unverified coolant types. Record the amount installed, product specification and service date to protect the next maintenance interval.
Never mix coolants by colour alone
A coolant’s appearance is not an engineering specification. Match the Ford specification stated in the 2015 manual for the particular engine and system. If the service history is uncertain or an incompatible fluid may have been added, have the cooling system assessed before topping up with an arbitrary universal mixture.
Recognizing a cooling-system issue
Repeatedly needing coolant, cabin heat changing unexpectedly, a sweet odour or overheating warning can indicate a leak or circulation issue. Inspect visible hose connections only when cool. On the naturally aspirated 3.5L V6, unexplained coolant loss merits prompt investigation because some water-pump failures are internal.
Use the correct model-year manual and current service information. Stop if instructions or safety precautions are unclear, and use a qualified technician for work you cannot verify.
References and further reading
This independent guide is not endorsed by the vehicle manufacturer. Let us know if you spot an error.