Mercedes-Benz 300E Car Thermostat Replacement at your home or office.

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$150.54 - $163.05

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Car Thermostat Replacement Estimate for Mercedes-Benz 300E

Mercedes-Benz 300E Car Thermostat Replacement costs $158 on average.

CarServiceEstimateShop/Dealer Price
1993 Mercedes-Benz 300EL6-3.2LService typeCar Thermostat ReplacementEstimate$226.09Shop/Dealer Price$282.09 - $403.45
1987 Mercedes-Benz 300EL6-3.0LService typeCar Thermostat ReplacementEstimate$231.11Shop/Dealer Price$288.26 - $413.31
1992 Mercedes-Benz 300EL6-2.6LService typeCar Thermostat ReplacementEstimate$231.11Shop/Dealer Price$288.36 - $413.49
1991 Mercedes-Benz 300EL6-3.0LService typeCar Thermostat ReplacementEstimate$236.11Shop/Dealer Price$292.10 - $416.29
1993 Mercedes-Benz 300EL6-2.8LService typeCar Thermostat ReplacementEstimate$226.09Shop/Dealer Price$285.03 - $408.60
1990 Mercedes-Benz 300EL6-3.0LService typeCar Thermostat ReplacementEstimate$231.11Shop/Dealer Price$286.22 - $409.75
1986 Mercedes-Benz 300EL6-3.0LService typeCar Thermostat ReplacementEstimate$231.11Shop/Dealer Price$282.84 - $403.83
1991 Mercedes-Benz 300EL6-2.6LService typeCar Thermostat ReplacementEstimate$236.11Shop/Dealer Price$290.85 - $414.09
Show example Mercedes-Benz 300E Car Thermostat Replacement prices

Car Thermostat Replacement 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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YourMechanic Mercedes-Benz 300E Service

Average Rating

4.6/5

Number of Reviews

12

Rating Summary
10
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Dante

35 years of experience
98 reviews
Dante
35 years of experience
Mercedes-Benz 300E - Other Inspections - Long Beach, California

Paul

18 years of experience
214 reviews
Paul
18 years of experience
Mercedes-Benz 300E - Ignition Coil - Tampa, Florida
Paul was very competent, and went out of his way to get my mom's car running again.

James

11 years of experience
233 reviews
James
11 years of experience
Mercedes-Benz 300E - Battery - San Francisco, California
Was given a "fixed price" for two services, one was completed but the other was not because the price for egr valve jumped significantly. In conversations with company reps I was not satisfied with their explanation of "fixed price" being only in regards to service charge as the website does not state that, it stated that there will be "no surprises, fixed price for services requested..." I feel there was false advertising. the battery was installed as part two of the service before being informed of the price hike so I wound up paying for that and not getting the main service completed. had the higher price been given initially I would not have booked the service at all.

Paul

24 years of experience
207 reviews
Paul
24 years of experience
Mercedes-Benz 300E - When I slow down and stop the car, engine shuts off - Las Vegas, Nevada
did good very professional

Excellent Rating


YourMechanic Mercedes-Benz 300E Service

Average Rating

4.6/5

Number of Reviews

12

Rating Summary
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Number of Mercedes-Benz 300E services completed
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