How much does a thermostat replacement cost?

Short answer: The national average for a thermostat replacement is roughly $616 to $716 before taxes and fees. On many cars the thermostat itself is a small, inexpensive part, but on some newer engines it comes built into a housing, which raises the parts price. Because overheating has several possible causes, a fair quote explains how the shop ruled out the others.

Camille the shop cat peering closely through a magnifying glass

Fair price range

Job	Typical total	Labor	Parts	Source
Thermostat replacement	$616 – $716	$195 – $286	$421 – $429	RepairPal
Radiator replacement (for comparison, if the radiator is leaking or clogged)	$1,368 – $1,550	$375 – $550	$993 – $1,001	RepairPal

Sources: RepairPal national averages, estimates last updated September 3, 2026 (checked October 30, 2026). Totals exclude taxes and shop fees and don’t reflect your location; your vehicle, region and shop can put you well outside these ranges.

The national parts average is high because many newer engines use a thermostat built into a plastic housing or an electronically controlled unit. On engines that use a simple drop-in thermostat, the part can cost a few dozen dollars (see the DIY example below), so ask what your car uses. The job also includes draining, refilling and bleeding the coolant.

What drives the price

Simple thermostat vs. housing assembly. A drop-in thermostat is cheap; an integrated housing or electronic thermostat costs much more.
Location. Some thermostats are easy to reach at the hose outlet; others sit under other parts and need more disassembly.
Coolant. The system is drained and refilled with the correct coolant type, then bled of air.
Related parts. A corroded housing or old hoses may be replaced at the same time.

What’s normal, and what’s worth questioning

Replacing the gasket or seal and refilling with the coolant type your manual specifies is normal.
Checking the whole cooling system (coolant level, pressure test, fans, water pump) before blaming the thermostat is good practice.
Replacing a corroded housing or brittle hoses found during the job is reasonable if they’re shown to you.
Worth questioning: a thermostat replaced for overheating with no pressure test or check of the coolant level, fans and water pump, or a coolant “flush” billed on top of the refill that’s already part of the job.

Do it yourself

Handy with tools? Here’s roughly what the parts cost if you do the work at home. Example vehicle: 2015 Toyota Camry 2.5L; prices checked October 30, 2026.

Part	Parts price	Notes	Source
Genuine Toyota thermostat, part 90916-A3003	$23 – $25	Online dealer prices from two sellers; confirm fitment by VIN. You’ll also need the coolant type in your owner’s manual.	ToyotaPartsDeal

Parts only, before tax and shipping. Prices change often and vary a lot by vehicle; look up your exact year, engine and VIN.

Difficulty: Moderate. The part is cheap, but you have to drain, refill and bleed the cooling system correctly, and some engines bury the thermostat under other parts.
Time: Roughly 1 to 2 hours on an easy layout, plus time for the engine to cool fully first.

Tools you’ll likely need

Socket set and extensions
Drain pan and a funnel (a spill-free bleeding funnel helps)
Hose pliers
Torque wrench for the housing bolts
The coolant your owner’s manual specifies

Where to buy parts

Online aftermarket: RockAuto (wide choice, often the lowest prices; shipping takes a few days).
Local parts stores: AutoZone, Advance Auto Parts, O’Reilly and NAPA (same-day pickup, easy core returns, and many test your old part free).
Genuine (OEM) parts: your dealer’s parts counter, or the carmaker’s online parts store (for example Mopar, GM Genuine Parts, Ford Parts or Toyota Parts), searched by your VIN.
European cars: brand specialists like FCP Euro (BMW, VW, Audi, Volvo, Mercedes) carry OEM and OE-supplier parts.

Watch how it’s done

Search YouTube for “thermostat replacement” videos → Add your year, make and model to the search for a closer match. Watch two or three before you start, since video quality varies.

At your own risk. Disconnect the negative battery cable before you start, work on a cool engine, and never work under a car held up only by a jack. If anything doesn’t match the video or feels unsafe, stop and call a shop. This is general information, not professional instructions.

Questions to ask the shop

What made you conclude it’s the thermostat? Did you pressure-test the cooling system and check the fans?
Is my car’s thermostat a simple part or built into a housing, and is that what’s quoted?
Does the price include the coolant refill and bleeding the air out?
Is the coolant you’re using the type my owner’s manual calls for?
If the engine overheated, did you check for head gasket or other damage?

Frequently asked questions

What are the signs of a bad thermostat?

A stuck-closed thermostat causes overheating, often quickly after startup. A stuck-open one makes the engine slow to warm up, leaves the heater blowing lukewarm air and can lower fuel economy, sometimes with a check engine code.

Can I drive with a bad thermostat?

If it’s stuck open, the car usually runs but warms up slowly; get it fixed before winter. If the temperature gauge climbs toward hot or a coolant warning comes on, pull over safely and turn the engine off, because driving an overheating engine can cause expensive damage.

Should the water pump be replaced with the thermostat?

Not automatically. It can make sense if the pump is leaking or the two parts share labor on your engine. Ask what condition the pump is in and what the combined price would be.

Why does my quote cost more than the thermostat part online?

The price includes labor, the coolant drain and refill and bleeding the air out. Some cars also use a thermostat built into a housing, which costs much more than a simple drop-in thermostat.

Related guides

Sources

Also worth checking: open recalls on your vehicle (NHTSA, above) before paying for a repair. A recall repair is free at a dealer.

General information from someone with automotive sales and service-writer experience, not professional mechanical advice and not a substitute for an inspection by a qualified technician. Cost ranges are national averages from the sources listed and vary by vehicle, region and shop.