# Thermostat replacement cost - **Typical cost:** $150-$450 - **Parts:** $20-$150 - **Labor:** 1-2.5 hours - **Dealer:** $250-$600 ## Quick answer Replacing an engine thermostat usually costs $150 to $450 at an independent shop. A simple thermostat that is easy to reach is at the low end. Thermostats built into a plastic housing, electronically controlled thermostats, and ones buried under other parts are at the high end. ## What is engine thermostat and why does it need replacing? The engine thermostat is a valve between the engine and the radiator. When the engine is cold it stays closed, keeping coolant inside the engine so it warms up quickly. As coolant reaches operating temperature, a wax pellet inside expands and opens the valve, sending coolant to the radiator to be cooled. Some newer engines use an electronically controlled thermostat that the engine computer can open earlier or later. Thermostats wear out from heat cycling and coolant condition. The spring weakens, the wax element degrades and corrosion or debris from old coolant can make the valve stick. A thermostat stuck open lets the engine run too cool, so it warms slowly, the heater blows lukewarm and code P0128 often sets. One stuck closed blocks coolant from the radiator, which can overheat the engine quickly. Plastic housings can also crack and leak. There is no set replacement interval, and many thermostats last 100,000 miles or more, though many shops replace one with a radiator or water pump on high-mileage cars. ## How much does thermostat replacement cost? | | Typical cost | | --- | --- | | Parts | $20-$150 | | Labor | $100-$300 (1-2.5 hours) | | Total at an independent shop | $150-$450 | | Total at a dealer | $250-$600 | | Do it yourself (parts only) | $20-$150 | ## Cost by vehicle type | Vehicle | Typical cost | | --- | --- | | Compact car | $150-$250 | | Midsize sedan | $170-$300 | | Small SUV/crossover | $180-$320 | | Full-size truck/SUV | $180-$330 | | Luxury/European | $300-$450 | Ranges are for an independent shop. Expect the high end or more for European luxury makes and dealer service. ## What changes the price? - **Thermostat design.** A basic thermostat costs very little. Many newer engines use a thermostat built into a plastic housing, so the whole housing must be replaced, and electronic thermostats with a heater and connector cost the most. - **Location.** Some thermostats sit right where the upper or lower radiator hose meets the engine. Others are under the intake, behind the alternator or deep in the engine valley, which can turn a short job into a few hours. - **Coolant.** Drained coolant must be replaced with the type your manual lists, and the system must be bled of air. Some engines need a vacuum filler or a specific bleeding procedure, which adds time and coolant cost. ## Can you do it yourself? Difficulty: **Moderate**, about 1-2 hours. Parts cost $20-$150, so doing it yourself saves the labor ($100-$300). ## What happens during the job? 1. Confirm the problem with the temperature gauge, scan-tool coolant readings and a check of hose temperature and coolant level. 2. Drain enough coolant to get below the thermostat, and remove any hoses, brackets or parts that block the housing. 3. Unbolt the housing, remove the old thermostat and clean the sealing surfaces. 4. Install the new thermostat facing the right way with a new gasket or seal, or fit the complete housing if it is integrated. 5. Refill with the correct coolant, bleed the air out, then run the engine to temperature and check for leaks and normal warm-up. ## What should a fair quote include? - The new thermostat and gasket or housing - Coolant top-off or refill with the correct type - Bleeding air from the cooling system - Checking for leaks and normal warm-up ## How to pay less for thermostat replacement - Check the coolant level and look for leaks first, since low coolant can mimic a thermostat problem. - Ask whether a thermostat alone can be replaced, or whether your engine requires the full housing. - Buy an original-equipment or known-brand thermostat; a cheap one that sticks means paying for the labor twice. - Replace the thermostat during a radiator, water pump or coolant service, when the coolant is already drained. - Do the job yourself if the thermostat sits where the upper hose meets the engine and the coolant is easy to bleed. ## Signs you need it - Temperature gauge reads high or the engine overheats - Temperature gauge stays low and the heater blows lukewarm - Check engine light with code P0128 - Coolant leaking around the thermostat housing ## Which models get the most engine cooling complaints? | Model | Engine cooling complaints to NHTSA | All complaints | | --- | --- | --- | | [Ford Escape](/vehicles/ford-escape) | 1,077 | 10,274 | | [Ford Edge](/vehicles/ford-edge) | 599 | 5,306 | | [Ford Explorer](/vehicles/ford-explorer) | 327 | 9,238 | | [Kia Soul](/vehicles/kia-soul) | 268 | 3,189 | | [Ram 1500](/vehicles/ram-1500) | 237 | 7,390 | | [Chevrolet Silverado](/vehicles/chevrolet-silverado) | 236 | 7,658 | | [Nissan Rogue](/vehicles/nissan-rogue) | 202 | 4,937 | | [GMC Sierra](/vehicles/gmc-sierra) | 196 | 5,041 | | [Toyota Tundra](/vehicles/toyota-tundra) | 113 | 1,830 | | [Hyundai Sonata](/vehicles/hyundai-sonata) | 95 | 4,126 | Owner complaints filed with NHTSA in the engine cooling category for 2015-2026 models of 63 popular cars. Counts follow sales as well as reliability, so compare each with the model's total. ## Frequently asked questions ### How much does it cost to replace a thermostat? Most independent shops charge $150 to $450 in 2026. Dealers usually charge $250 to $600. Electronic thermostats and integrated housings are at the high end. The part itself ranges from about $20 for a basic thermostat to $150 for a housing assembly, and labor covers draining and bleeding the coolant. ### Can a bad thermostat cause overheating? Yes. A thermostat stuck closed blocks coolant from reaching the radiator, and the engine can overheat quickly. Stop driving if the gauge climbs into the red. Overheating can warp the cylinder head or damage the head gasket, which costs far more than a thermostat. ### What happens if a thermostat is stuck open? The engine takes a long time to warm up, the heater blows cool air, and fuel economy drops. It often sets code P0128. It is not an emergency but should be fixed, since an engine that runs too cool wears faster and may fail an emissions test. ### Can I drive with a bad thermostat? If it is stuck open, usually yes for a short time, though the heater will be weak. If it is stuck closed and the engine overheats, no. Stop as soon as it is safe, let the engine cool and have the car towed if the gauge keeps climbing. ### How long does a thermostat replacement take? Most shops need about 1 to 2.5 hours. Thermostats at the end of a radiator hose are quick, while ones under the intake or behind other parts take longer. Bleeding air from the cooling system and confirming normal warm-up add time at the end. ### Can I replace a thermostat myself? Often, yes, if it is easy to reach. You need to drain some coolant, unbolt the housing, fit the new thermostat facing the right way with a new gasket, then refill and bleed the system. Trapped air can cause overheating, so follow the bleeding procedure carefully. ### What are the signs of a bad thermostat? A temperature gauge that reads high or climbs fast, or one that stays low, are the main signs. A heater that blows lukewarm air, code P0128 and coolant leaking around the thermostat housing are others. A scan tool showing slow warm-up helps confirm it. ### Should I replace the thermostat with the water pump? It often makes sense, especially on higher-mileage engines. The coolant is already drained and on some engines the thermostat sits near the pump, so the extra labor is small. Ask the shop to quote it as an option rather than adding it automatically. ### How long does a thermostat last? There is no set interval, and many thermostats last 100,000 miles or more. Old or wrong coolant, corrosion and overheating can make one stick sooner. Changing the coolant on schedule helps the thermostat and the rest of the cooling system last longer. ### Can I remove the thermostat instead of replacing it? No. Running without a thermostat makes the engine warm up slowly and run too cool, which raises fuel use and wear, weakens the heater and often sets a check engine code. On some engines it can also cause overheating by upsetting coolant flow. Always install a new one. ## Sources - [Car Care Council: Car care guide](https://www.carcare.org/car-care-guide/) ## How long it lasts - [How often should you change coolant?](https://diagxcar.com/how-often/change-coolant) - [How long does a water pump last?](https://diagxcar.com/how-long/water-pump) ## Symptoms - [Why is my car overheating?](https://diagxcar.com/symptoms/car-overheating) - [Why is my car heater not working?](https://diagxcar.com/symptoms/car-heater-not-working) - [Why is my car getting bad gas mileage?](https://diagxcar.com/symptoms/poor-gas-mileage) ## Related codes - [P0128 Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature)](https://diagxcar.com/codes/p0128) - [P0217 Engine Coolant Over Temperature Condition](https://diagxcar.com/codes/p0217) - [P0117 Engine Coolant Temperature Sensor 1 Circuit Low](https://diagxcar.com/codes/p0117) - [P0118 Engine Coolant Temperature Sensor 1 Circuit High](https://diagxcar.com/codes/p0118) - [P0125 Insufficient Coolant Temperature for Closed Loop Fuel Control](https://diagxcar.com/codes/p0125) ## Other repair costs - [Tie rod replacement cost](https://diagxcar.com/cost/tie-rod-replacement): $180-$400 - [Starter replacement cost](https://diagxcar.com/cost/starter-replacement): $350-$900 - [Timing belt replacement cost](https://diagxcar.com/cost/timing-belt-replacement): $500-$1,300 - [Spark plug replacement cost](https://diagxcar.com/cost/spark-plug-replacement): $120-$450 - [Timing chain replacement cost](https://diagxcar.com/cost/timing-chain-replacement): $1,200-$3,500 - [Shocks and struts replacement cost](https://diagxcar.com/cost/shocks-and-struts-replacement): $350-$1,100 - [Tire rotation cost](https://diagxcar.com/cost/tire-rotation): $25-$60 - [Serpentine belt replacement cost](https://diagxcar.com/cost/serpentine-belt-replacement): $100-$250 - [TPMS sensor replacement cost](https://diagxcar.com/cost/tpms-sensor-replacement): $90-$250 - [Radiator replacement cost](https://diagxcar.com/cost/radiator-replacement): $500-$1,200 ## Warning lights linked to this - [Coolant temperature warning light](https://diagxcar.com/warning-lights/coolant-temperature) ## Terms explained - [What is Coolant?](https://diagxcar.com/glossary/coolant) --- Source page: https://diagxcar.com/cost/thermostat-replacement Updated: 2026-11-03 General information, not a substitute for a qualified mechanic.