Mercedes-Benz SL400 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 SL400 Car Thermostat Replacement is $570 with $333 for parts and $237 for labor. Prices may vary depending on your location.

CarServiceEstimateShop/Dealer Price
2015 Mercedes-Benz SL400V6-3.0L TurboService typeCar Thermostat ReplacementEstimate$954.14Shop/Dealer Price$1164.56 - $1697.37
2016 Mercedes-Benz SL400V6-3.0L TurboService typeCar Thermostat ReplacementEstimate$902.90Shop/Dealer Price$1113.08 - $1645.02
Show example Mercedes-Benz SL400 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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Excellent Rating

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David

10 years of experience
170 reviews
David
10 years of experience
Mercedes-Benz SL400 V6-3.0L Turbo - Pre-purchase Car Inspection - Orlando, Florida
Pre-Purchase service - On time with appointment. Follow up call and report was generated immediately which is greatly appreciate. Many thanks!!

Chris

20 years of experience
448 reviews
Chris
20 years of experience
Mercedes-Benz ML350 V6-3.5L - Thermostat - Hillsboro, Oregon
Chris was prompt, efficient and did the work in a timely manner.

Corey

27 years of experience
43 reviews
Corey
27 years of experience
Mercedes-Benz CLK55 AMG V8-5.5L - Thermostat - Alpharetta, Georgia
Corey was great. Answered all my questions and was patient. Thanks. I will use Corey again.

Tinashe

13 years of experience
605 reviews
Tinashe
13 years of experience
Mercedes-Benz ML350 V6-3.5L - Thermostat - Atlanta, Georgia
Showed up early, was personable and quick. Very professional. Would definitely use him again.

Excellent Rating

(64)

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