Mercedes-Benz ML450 Car Thermostat Replacement at your home or office.

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Car Thermostat Replacement Service

How much does a Car Thermostat Replacement cost?

On average, the cost for a Mercedes-Benz ML450 Car Thermostat Replacement is $442 with $272 for parts and $171 for labor. Prices may vary depending on your location.

CarServiceEstimateShop/Dealer Price
2011 Mercedes-Benz ML450V6-3.5L HybridService typeCar Thermostat ReplacementEstimate$750.00Shop/Dealer Price$917.26 - $1348.16
2010 Mercedes-Benz ML450V6-3.5L HybridService typeCar Thermostat ReplacementEstimate$714.00Shop/Dealer Price$881.32 - $1312.25
Show example Mercedes-Benz ML450 Car Thermostat Replacement prices

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 Mercedes-Benz mechanics

Real customer reviews from Mercedes-Benz owners like you.

Excellent Rating

(64)

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Tung

16 years of experience
310 reviews
Tung
16 years of experience
Mercedes-Benz CLA250 L4-2.0L Turbo - Thermostat - Atlanta, Georgia
Very professional and punctual. Got the job done!! Will request again in the future!!

Richard

11 years of experience
450 reviews
Richard
11 years of experience
Mercedes-Benz ML500 V8-5.0L - Thermostat - Houston, Texas
Shows up on time and gets the job completed in a timely manner never any issues.

Emmette

36 years of experience
282 reviews
Emmette
36 years of experience
Mercedes-Benz C300 V6-3.0L - Car Thermostat Replacement - Springfield, Virginia
Emmette arrived on time, asked about car concerns, provided his oppinion and promptly fixed my car. He was professional, courteous and prompt. He meticulously cleaned the area upon completion of the job. After today's job, Emmette is my new mechanic and I will be referring him to family and friends.

Richard

11 years of experience
450 reviews
Richard
11 years of experience
Mercedes-Benz E350 V6-3.5L - Thermostat - Washington, District of Columbia
Richard is very knowledgeable about my mercedes benz. I like that he explains and teaches me about my vehicle as he repairs it. He is an excellent mechanic.

Excellent Rating

(64)

Rating Summary
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Number of Mercedes-Benz Car Thermostat Replacement services completed
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