Mercedes-Benz S500 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 S500 Car Thermostat Replacement is $209 with $104 for parts and $104 for labor. Prices may vary depending on your location.

CarServiceEstimateShop/Dealer Price
2001 Mercedes-Benz S500V8-5.0LService typeCar Thermostat ReplacementEstimate$439.54Shop/Dealer Price$529.19 - $727.24
1996 Mercedes-Benz S500V8-5.0LService typeCar Thermostat ReplacementEstimate$379.48Shop/Dealer Price$463.17 - $643.21
1994 Mercedes-Benz S500V8-5.0LService typeCar Thermostat ReplacementEstimate$312.87Shop/Dealer Price$384.25 - $555.00
2000 Mercedes-Benz S500V8-5.0LService typeCar Thermostat ReplacementEstimate$394.62Shop/Dealer Price$482.02 - $673.36
1999 Mercedes-Benz S500V8-5.0LService typeCar Thermostat ReplacementEstimate$379.48Shop/Dealer Price$463.21 - $643.29
2004 Mercedes-Benz S500V8-5.0LService typeCar Thermostat ReplacementEstimate$403.54Shop/Dealer Price$493.24 - $691.32
1997 Mercedes-Benz S500V8-5.0LService typeCar Thermostat ReplacementEstimate$388.48Shop/Dealer Price$471.73 - $651.45
1995 Mercedes-Benz S500V8-5.0LService typeCar Thermostat ReplacementEstimate$388.36Shop/Dealer Price$472.76 - $653.27
Show example Mercedes-Benz S500 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

(94)

Rating Summary
87
5
0
0
2
87
5
0
0
2

Christopher

10 years of experience
114 reviews
Christopher
10 years of experience
Mercedes-Benz S500 V8-5.0L - Valve Cover Gasket - Katy, Texas
Excellent service Highly recommend! Very professional and knows his stuff!

Rigoberto

11 years of experience
739 reviews
Rigoberto
11 years of experience
Mercedes-Benz S500 V8-5.0L - Fuel Pump - Chicago, Illinois
Quickly replaced a fuel pump and recommended a few lost cost ways to fix other minor issues.

Robert

37 years of experience
237 reviews
Robert
37 years of experience
Mercedes-Benz S500 V8-5.0L - Check Engine Light is on - Atlanta, Georgia
Robert confirmed for me what I had already read about the problem.

Mazyar

8 years of experience
464 reviews
Mazyar
8 years of experience
Mercedes-Benz S500 V8-5.0L - Strut Assembly Replacement (Rear) - Atlanta, Georgia
Excellent mechanic, super pleasant. Knows his craft well.. He invited myself and husband to be nearby while he worked on our car. I appreciated his constant communication and feedback about the repair of the car. I believed him to be fair and honest. I appreciated his knowledge and all the steps he took to repair my car. My car is an Mercedes 02 S500. The job was to replace two rear struts. Due to complications that did not involve Mr. Mazyar one could not be changed. Mr. Mazyar gave me a refund for the part of the service he was unable to perform. A full 50 point inspection was performed and my service ended. I appreciated Mr. Mazyar the mechanic and highly recommend him to anyone needing a car repair.

Excellent Rating

(94)

Rating Summary
87
5
0
0
2
87
5
0
0
2
Number of Mercedes-Benz S500 services completed
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