Ford Explorer coolant flush:$140 to $220at most shops, 2026
The Explorer's rear heater core is the cost driver. A flush that misses the rear circuit leaves about 15 percent of the coolant unchanged, which is why dealer pricing premium versus a chain is more justified on the Explorer than on a sedan. The 2020 Ford chemistry switch to orange OAT applies here too.
DIY
$50 - $90
Easier on no-rear-AC trims
Chain / indy
$140 - $220
Verify rear circuit
Ford dealer
$200 - $300
Rear circuit included
Explorer spec card
Cooling systemRear heater story
Why three-row SUVs cost more to flush
The Explorer in Limited, Platinum, and ST trim includes rear AC and a rear heater core to provide cabin comfort to the third row. The rear heater core is a smaller version of the front heater core, mounted near the rear of the vehicle and fed by coolant lines that run the length of the chassis.
For a coolant flush this matters in two ways. First, the system holds 0.3 to 0.5 gallons more coolant than a non-rear-heater configuration. Second, the rear circuit needs to be included in the flush to fully exchange the fluid. A flush that only drains the radiator and front circuit leaves the rear-circuit coolant intact, which means about 15 percent of the system stays old.
The correct flush procedure on a rear-heater Explorer runs the engine with the rear AC system commanded to heat for several minutes during the flush cycle. This circulates coolant through the rear heater core and ensures the new fluid reaches the back of the vehicle. The dealer always does this. Many chain quick-lubes do not unless you ask explicitly.
When booking a flush on a Limited or higher Explorer, ask whether the shop's procedure includes the rear circuit. A "yes, with rear AC commanded on" is the right answer. A "we just do the radiator" is the wrong answer for these trims. The XLT and below trims do not have rear heater so the question does not apply.
Explorer trim coolant capacity
| XLT (no rear AC) | ~2.8 gal |
| XLT with rear AC option | ~3.1 gal |
| Limited | ~3.1 gal |
| Platinum | ~3.5 gal |
| ST | ~3.5 gal |
| King Ranch (where offered) | ~3.5 gal |
Capacity figures from Ford service literature. Buy at least 4 gallons of coolant for any rear-heater Explorer to allow for refill plus future top-off needs.
Generation notes
Explorer pricing by generation
5th gen (2011-2019)
$130 - $200Yellow HOAT chemistry. 2.0L / 2.3L EcoBoost or 3.5L V6. Aging fleet, many on original coolant past interval.
6th gen (2020-present)
$140 - $220Orange OAT chemistry. RWD-based platform. 2.3L EcoBoost or 3.0L EcoBoost ST.
Police Interceptor
$160 - $240Heavy-duty cooling, larger radiator. Same coolant and intervals.
Explorer Hybrid
$170 - $260Engine + inverter circuits. Inverter coolant dealer-only.
Explorer ST
$160 - $2403.0L EcoBoost twin-turbo. Track-tuned cooling. Same chemistry as base.
Explorer King Ranch / Platinum
$160 - $240Full rear AC, larger system, longer labor time for thorough flush.
Common questions
Ford Explorer coolant flush FAQ
How much does a Ford Explorer coolant flush cost in 2026?
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A Ford Explorer coolant flush costs $140 to $220 at most independent shops in 2026. The Explorer's rear-passenger heater core (on Limited and higher trims) adds capacity and labor time compared to a sedan flush. Ford dealers charge $200 to $300.
What coolant does the Ford Explorer use?
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2020 and later Explorers (6th generation) use Motorcraft Orange (OAT, WSS-M97B57-A1). Pre-2020 Explorers used Motorcraft Yellow (HOAT). The Explorer Hybrid follows the same engine-side coolant; the hybrid drive system has its own inverter coolant.
How much coolant does an Explorer hold?
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The 6th gen Explorer (2020+) holds about 3.0 gallons of Motorcraft Orange depending on engine. The 2.3L EcoBoost takes about 2.8 gallons. The 3.0L EcoBoost in the ST and Platinum trims takes about 3.2 gallons. Trims with rear AC and rear heater (Limited, Platinum, ST) hold an additional 0.3 to 0.5 gallons for the rear heater core circuit.
Does the rear heater core affect the flush?
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Yes. The rear heater core needs to be included in a proper flush, particularly for trims that have one. A flush that only touches the front circuit leaves contaminated coolant in the rear circuit. Ask the shop explicitly whether their flush includes the rear heater. The dealer always does; many chains do not by default.
What is the Explorer flush interval?
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100,000 miles or 6 years for the first flush. Subsequent flushes at 50,000 miles or 3 years. The 6-year first calendar limit catches many Explorer owners since the SUV is often used for family duty rather than high mileage.
Is the Explorer DIY-friendly?
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Moderately. The front cooling system is straightforward, but the rear heater circuit on Limited and higher trims requires additional bleeding to fully purge air. Trims without rear AC (XLT and below) are easier. Total DIY time about 90 to 120 minutes.
Police Interceptor Explorer different?
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The Police Interceptor Utility (the law-enforcement version of the Explorer) has heavy-duty cooling that includes an oil cooler integrated with the cooling system. The coolant is the same Motorcraft Orange and the interval is the same. Some PI Explorers have a higher-capacity radiator that holds about 0.5 gallon more than the civilian version.