Coolant flush cost in 2026:$131 to $209the national average
That is Kelley Blue Book's average for a coolant (radiator) flush. Take 5, the only big chain that publishes a price, says $90 to $160. Jiffy Lube, Valvoline, Firestone and Midas quote per store. Check a quote you have been given below.
Kelley Blue Book
$131-$209
National average, any shop
Take 5
$90-$160
Chain's own published range
DIY coolant
$13.68/gal
Prestone 50/50, Walmart.com
Coolant Spectrum
Match the colour, mind the chemistry- IAT Pre-2000 US vehicles, 2 yr / 30k mi interval
- OAT GM Dex-Cool, VW, 5 yr / 150k mi
- HOAT Ford, Chrysler, many European, 5 yr / 150k mi
- PHOAT Toyota (pink), Honda and Subaru (blue), 5-10 yr
Never mix types. Inhibitor packages react and form a gel that blocks the heater core.
Service Desk
Coolant Flush Cost Checker
Listed under "capacities" in your owner's manual. Use the full system figure, not the reservoir.
Concentrate is mixed half and half with distilled water, so you need half as much of it.
Starts at $13.68, Walmart.com's price for a gallon of Prestone Universal 50/50 on 23 October 2026. Use the price of the coolant your manual specifies.
Coolant alone
$27.36
2 gallons to fill 8 quarts. This is the parts share of any quote, and the whole cost if you do it yourself.
Published references
- Take 5 coolant exchange (its own published range)$90 to $160
- Kelley Blue Book national average$131 to $209
How this is calculated
Gallons = capacity in quarts / 4 for pre-mixed, / 8 for concentrate, rounded up to whole bottles, times your price per gallon. A shop exchange may run extra fluid through the system, so a shop can use more than this. The references are Take 5's coolant exchange FAQ and Kelley Blue Book's coolant flush page, both read 23 October 2026.
Service breakdown
What each service actually does
Drain-and-fill
Radiator drained by gravity and refilled. Coolant held in the block and heater core stays and mixes with the new.
What shops say: Firestone says many makers' procedures call for a drain and fill.
Best for: Systems serviced on schedule
Machine exchange
A machine circulates new coolant through the system while drawing the old out.
What shops say: Take 5: under an hour, stay in the car. Valvoline: about 20 minutes.
Best for: Overdue or discoloured coolant
Exchange plus cleaner and leak test
As above, plus a cleaner or conditioner and a pressure test.
What shops say: Firestone lists conditioners, sealants and a pressure test, with a 12-month/12,000-mile warranty.
Best for: Brown coolant, scale, or a slow coolant loss
DIY drain-and-fill
You drain, refill and bleed the air out yourself.
What shops say: The cost is the coolant: use the checker above.
Best for: Confident DIYers with the right coolant
Pricing factors
What drives your final number
Shop's posted rate
Labor rate
Most of a quote is shop time. Ask for the shop's hourly rate and how long it books for the job; a machine exchange and a drain-and-fill take different times.
Capacity x price
Coolant type and volume
Bigger systems take more gallons, and maker-specific coolants cost more than universal ones. Take 5 says its price depends on the amount and type of coolant.
Gravity vs machine
Service method
A machine flush costs more in shop time and equipment but replaces nearly all the fluid. Gravity drain is faster and cheaper but partial.
Dealer vs chain vs indy
Location and shop
Take 5 publishes $90 to $160. Kelley Blue Book's national average is $131 to $209. Other chains, dealers and independents quote per store, so compare two or three.
Where to get it done
What the big chains charge for a coolant flush
Take 5
$90 to $160
Coolant Exchange
Jiffy Lube
Quoted per store
Radiator Coolant Fluid Exchange
Valvoline Instant Oil Change
Quoted per store
Radiator fluid exchange
Firestone Complete Auto Care
Quoted per store
Coolant Fluid Exchange
Midas
Quoted per store
Radiator Flush
Kelley Blue Book average
$131 to $209
Any shop, national
How we priced this: we read each chain's own service page on 23 October 2026. Only Take 5 states a price (its coolant exchange FAQ). Where a chain publishes nothing we print nothing rather than a guess. The national figure is Kelley Blue Book's coolant flush page, which says a radiator flush "can average between $131 and $209".
Why service is needed
Coolant degrades with every heat cycle
Coolant is not just water and dye. It carries a package of corrosion inhibitors that protect aluminum, iron, copper, and rubber inside the cooling system. Those inhibitors deplete with use. Once they are gone, the coolant turns mildly acidic and starts attacking the metal it was supposed to protect.
Heat cycles, contamination from dissolved minerals, and small amounts of combustion gas pushed past the head gasket all accelerate the breakdown. Hot climates and stop-and-go driving make it worse. Towing and hauling stress the system further.
Fresh coolant
- + pH 8 to 11, slightly alkaline
- + Active inhibitors coat metal surfaces
- + Clean, transparent fluid
- + Heat transfer at design specification
Old coolant
- ! pH below 7, mildly acidic
- ! Inhibitors depleted, metal exposed
- ! Brown or rust-coloured, murky
- ! Scale deposits restrict flow
Engine coolant temperature
Operating windowWhen the gauge climbs past normal on a route the vehicle used to handle easily, blocked passages from scale and depleted inhibitors are reducing flow. Flush before a thermostat or water pump fails.
Critical safety note
Never mix coolant types
Mixing IAT (green) with OAT (orange) is the most common mistake. The silicate inhibitors in green react with the organic acids in orange and form a gel that blocks the heater core, the thermostat housing, and narrow radiator passages. The damage is real, the repair is expensive, and a single bad fill can cost more than ten years of correct service.
Modern vehicles often need OEM-spec coolant. A Toyota wants pink SLLC, a Honda blue Type 2, a Mercedes purple Si-OAT. Universal yellow is fine for emergency top-offs but not for the actual flush on those vehicles. Verify the spec, not the colour.
Coolant type lookup →Reference desk
Go deeper on the topic that matters to you
Shop prices
Jiffy Lube, Valvoline, Firestone, dealer, indy, the upsell guide.
Read →Flush vs drain
Which service to ask for, and when the cheaper one is enough.
Read →Coolant types
IAT, OAT, HOAT, PHOAT, Si-OAT mapped to specific vehicles.
Read →By vehicle
Compact, SUV, truck, European, plus 8 model breakdowns.
Read →When to flush
Toyota 100k, GM 150k, Honda 60k. Real interval table.
Read →DIY guide
Tools, materials, the air-bleed step everyone skips.
Read →Save money
8 strategies that beat random Groupon deals.
Read →Cost estimator
Build your own range from vehicle, shop, and condition.
Read →Common questions
Coolant flush FAQ
How much does a coolant flush cost?
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Kelley Blue Book puts the average coolant (radiator) flush at $131 to $209. Take 5, the only large chain that publishes a price, says its coolant exchange usually costs $90 to $160 depending on vehicle and coolant. Jiffy Lube, Valvoline, Firestone and Midas quote per store. Doing it yourself costs the coolant: a gallon of Prestone Universal 50/50 was $13.68 at Walmart.com, multiplied by the gallons your system holds. Prices checked 23 October 2026.
Is a radiator flush the same as a coolant flush, and does antifreeze cost extra?
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Radiator flush, antifreeze flush, and coolant flush all describe the same service: replacing the fluid in your engine cooling system. Antifreeze and coolant are the same product, and Kelley Blue Book's $131 to $209 average is quoted for a radiator flush. What does move the price is the method (a drain and fill renews less fluid than a machine exchange) and the coolant your vehicle needs: Take 5 says its price depends on the amount and type of coolant.
How often should you flush coolant?
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It depends on the coolant type, not a single number. Older IAT (green) coolant needs replacing every 2 to 3 years or 30,000 miles. Modern OAT, HOAT, and PHOAT coolants last 5 to 10 years and 100,000 to 150,000 miles. Toyota, GM, Honda, and Subaru each have different intervals.
Can you mix green and orange coolant?
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No. Mixing IAT (green) with OAT (orange) causes the inhibitor packages to react and form a gel that blocks the heater core, thermostat housing, and narrow radiator passages. If types have already been mixed, a full machine flush is required, not a drain-and-fill.
What is the difference between a coolant flush and a drain-and-fill?
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A drain-and-fill opens the radiator petcock and lets gravity remove what it can, which leaves the coolant held in the engine block and heater core in place. A machine exchange connects to the cooling system and circulates new coolant through it, renewing much more of the fluid. Firestone says it follows each maker's procedure, usually a drain and fill or a controlled exchange.
Can you do a coolant flush yourself?
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Yes, a drain-and-fill is beginner-friendly, and the main cost is the coolant: use the checker above with your system capacity and the coolant your manual specifies. Tools needed: drain pan, basic wrench set, gloves, a flush kit T-adapter, distilled water, and the correct coolant for your vehicle. The trickiest step is bleeding air from the system, which most guides skip. Never pour coolant down a drain.
How long does a coolant flush take?
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Chains publish their own times: Valvoline says about 20 minutes for a radiator fluid replacement, and Take 5 says a coolant exchange is usually completed in under an hour, with you staying in the car. A shop that adds a chemical cleaner or a pressure test will take longer; ask when you book.