Best Prices for Car Thermostat Replacement

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How much does Car Thermostat Replacement cost?

It depends on the type of car you drive and the auto repair shop you go to. Our mechanics are mobile, which means they don't have the overhead that repair shops have. They provide you convenience by coming to your home or office.

Car Thermostat Replacement pricing for various cars

CarsEstimateParts CostLabor CostSavingsAverage Dealer Price
2014 Mitsubishi Lancer$261$115.07$145.99-17%$222.57
2011 Mazda 2$295$90.22$204.38-22%$240.72
2013 Nissan Pathfinder$311$106.46$204.38-20%$256.96
2014 Mercedes-Benz B250$497$234.15$262.78-16%$427.65
2015 Mercedes-Benz GL450$716$350.97$364.97-15%$619.72
2011 Porsche Cayman$526$321.67$204.38-11%$472.17

Car Thermostat Replacement Service

What is the Engine Cooling System Thermostat?

The car's engine cooling system thermostat is a small valve within a cooling system passageway that opens and closes in response to the temperature of the circulating engine coolant. When your car is first started and the coolant is cold, the valve in the thermostat will be in the closed position, circulating the coolant flow only within the engine instead of flowing to the radiator, which allows the engine to warm up fast, promoting fuel efficiency, low emissions, and reduced engine deposits. Once the engine coolant reaches the design temperature, usually around 195 degrees, the valve will open and close as you drive in order to maintain a coolant temperature typically between 195 to 225 degrees Fahrenheit.


When to Consider a Thermostat Replacement

There are many symptoms that can indicate a bad thermostat, including:

  • Coolant temperature warning light illuminated. This coolant temperature warning light illuminates when the engine is sensed to be too hot and is at risk of overheating. It’s important to address this immediately in order to avoid an overheating engine.
  • Engine overheats. A thermostat with the valve stuck closed is a common cause of engine overheating. However, since there are other causes of overheating, a mechanic will thoroughly inspect the cooling system prior to condemning the thermostat. Since it is usually not known how badly the engine overheated, the mechanic will also try to determine if there is evidence that the cylinder head gasket was blown. If so, it would be repaired prior to replacing the thermostat.
  • Temperature gauge reads too low or too high. Thermostats can get sticky, causing the engine temperature to stray from the optimal range. Your dash-mounted temperature gauge will notify you of this malfunction.
  • Cooling system repairs. All thermostats eventually fail. Therefore, if the cooling system is already open for major repairs, such as a water pump or radiator replacement, it is recommended to install a new thermostat simply as insurance against future breakdown.

Is it Safe to Drive with a Thermostat Problem?

No. If it has been determined that there is a thermostat problem, it should be repaired right away. Failure to do so can cause substantial and costly damage to the engine.

How YourMechanic Replaces the Coolant Thermostat

When you choose to work with YourMechanic, a trusted mobile mechanic near you will come to wherever you need for an inspection or replacement.

One of YourMechanics technicians will follow this general process when diagnosing and replacing the coolant thermostat:

  1. Once the engine is completely cold, the radiator cap is loosened and enough coolant is drained from the radiator so the coolant level is below the thermostat housing.
  2. The thermostat housing is removed and the thermostat and gasket are extracted. Note that some cars have more than one cooling system thermostat and both might need replacement.
  3. All mounting surfaces on the thermostat housing are cleaned of old gasket material. A new gasket is applied and the thermostat is re-installed in the correct orientation and with the temperature sensing cylinder facing downward towards the engine.
  4. The thermostat housing bolts are tightened to original equipment manufacturer (OEM) specifications using a calibrated inch-pound torque wrench.
  5. The cooling system is refilled with the appropriate coolant type and the system is fully bled of all air.
  6. The car engine is run until the normal operating temperature is reached, and while taking precautions with the hot coolant, the coolant level is rechecked while confirming there is flow through the radiator — either visually or with an infrared temperature gun. This will confirm the thermostat is open.
  7. Finally, the engine is checked for leaks.

When Getting a Thermostat Replacement Keep in Mind:

  • Engine overheating due to causes other than a faulty thermostat, will themselves damage a thermostat. Therefore, always replace the thermostat if the engine overheats, even if the thermostat was not the initial cause of the overheating.
  • The thermostat should be replaced anytime you have major work done on the coolant system. It is convenient and costs little during such repairs and insurance against future breakdown.
  • OEM thermostats are the best ones to use and you can request your mechanic to install only the OEM thermostat. Dealer supplied, OEM thermostats are sometimes more costly but are generally higher quality and specifically engineered for your car.

Recent Car Thermostat Replacement reviews

Excellent Rating


Rating Summary


40 years of experience
1080 reviews
40 years of experience
Ford F-150 V8-5.0L - Thermostat - Buford, Georgia
Amazing. On time and completed the work super fast. Full explanation and a handshake later and my issues were solved! Will use Dan again for sure!


23 years of experience
624 reviews
23 years of experience
Toyota Camry L4-2.4L - Thermostat - Phoenix, Arizona
Attention to detail and provided clear information to his findings. Acted in a Profesional manner throuout


35 years of experience
731 reviews
35 years of experience
Buick Enclave V6-3.6L - Thermostat - Phoenix, Arizona
William was amazing!! He is definitely a pro Mechanic! I highly recommend him . I will definitely be using his service in the near and further future. Thank you William


22 years of experience
1277 reviews
22 years of experience
Chrysler PT Cruiser L4-2.4L - Car Thermostat Replacement - San Jose, California
Pardeep was extremely efficient and knowledgeable. He came the house and got right to work. Problem solved in less than 1 hour. He actually called me and was able to start work even sooner than anticipated.

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