Mazda 3 Car Thermostat Replacement at your home or office.

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received a Thermostat Replacement.
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$148.25 - $210.64

Price range for all vehicles


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Car Thermostat Replacement Estimate for Mazda 3

Mazda 3 Car Thermostat Replacement costs $186 on average.

CarServiceEstimateShop/Dealer Price
2011 Mazda 3L4-2.0LService typeCar Thermostat ReplacementEstimate$269.57Shop/Dealer Price$328.91 - $461.77
2015 Mazda 3L4-2.0LService typeCar Thermostat ReplacementEstimate$213.75Shop/Dealer Price$259.22 - $350.29
2018 Mazda 3L4-2.0LService typeCar Thermostat ReplacementEstimate$271.99Shop/Dealer Price$329.80 - $463.15
2018 Mazda 3L4-2.5LService typeCar Thermostat ReplacementEstimate$271.99Shop/Dealer Price$331.49 - $466.12
2007 Mazda 3L4-2.3LService typeCar Thermostat ReplacementEstimate$269.57Shop/Dealer Price$331.52 - $466.34
2010 Mazda 3L4-2.3L TurboService typeCar Thermostat ReplacementEstimate$268.25Shop/Dealer Price$325.51 - $456.08
2009 Mazda 3L4-2.3L TurboService typeCar Thermostat ReplacementEstimate$293.79Shop/Dealer Price$354.54 - $502.09
2016 Mazda 3L4-2.5LService typeCar Thermostat ReplacementEstimate$251.97Shop/Dealer Price$306.04 - $425.06
Show example Mazda 3 Car Thermostat Replacement prices

Service

What is an engine cooling system thermostat and how does it work?

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.

Thermostat

When to consider replacing the engine cooling system thermostat:

  • 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 water pump or radiator replacement, it is recommended to install a new thermostat simply as insurance against future breakdown.

How do mechanics replace the engine cooling system thermostat?

  • 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.
  • 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.
  • 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.
  • The thermostat housing bolts are tightened to original equipment manufacturer (OEM) specifications using a calibrated inch-pound torque wrench.
  • The cooling system is refilled with the appropriate coolant type and the system is fully bled of all air.
  • 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. Finally, the engine is checked for leaks.

Is it safe to drive with an engine cooling system 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.

When replacing the engine cooling system thermostat 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.

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Meet some of our expert Mazda mechanics

Real customer reviews from Mazda owners like you.

Excellent Rating


YourMechanic Mazda 3 Thermostat Replacement Service

Average Rating

4.7/5

Number of Reviews

17

Rating Summary
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Jose

14 years of experience
433 reviews
Jose
14 years of experience
Jose was awesome! He was right on time and got the repair done faster than I thought. He was also thorough in his work, and took his time explaining exactly what was wrong with my vehicle, what he did to fix it, and made sure that nothing else was amiss. He came prepared with the right equipment and was very clean with the work. Should I need to use YourMechanic again, I'll ask for him. :)
2008 MAZDA 3 - THERMOSTAT - VANCOUVER, WASHINGTON

Ramiro

18 years of experience
39 reviews
Ramiro
18 years of experience
Kind, informative. He took the time to ensure that the correct repairs were needed by running with me through the symptoms that I was observing.
2007 MAZDA 3 - CAR THERMOSTAT REPLACEMENT - SAMMAMISH, WASHINGTON

Grzegorz

38 years of experience
440 reviews
Grzegorz
38 years of experience
Grzegorz did it fast and explained the fix well!
2011 MAZDA 3 - THERMOSTAT - DALY CITY, CALIFORNIA

Robert

29 years of experience
179 reviews
Robert
29 years of experience
Robert was very professional, knowledgeable and very trustworthy. Went above and beyond and finished everything on time I will definitely book Robert again.
2004 MAZDA 3 - THERMOSTAT - SAN JOSE, CALIFORNIA

Excellent Rating


YourMechanic Mazda 3 Thermostat Replacement Service

Average Rating

4.7/5

Number of Reviews

17

Rating Summary
16
1
0
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16
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Red-stars EXCELLENT RATING ON
Number of Mazda 3 Thermostat Replacement services completed
187+
services done by our mechanics
TOTAL NUMBER OF EXPERT Mazda MECHANICS
700+
experts on our platform

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