Mercedes-Benz S320 Car Thermostat Replacement at your home or office.

Our mobile mechanics offer services 7 days a week. Upfront and transparent pricing.

Estimate price near me

Service Location

Customer Ratings

(16)

Included for free with this service

Online Booking

Mechanic comes to you

12-month / 12k-mile warranty

Free 50 point safety inspection

Our certified mobile mechanics can come to your home or office 7 days a week between 7 AM and 9 PM.

Customer Ratings

(16)

Car Thermostat Replacement Service

How much does a Car Thermostat Replacement cost?

On average, the cost for a Mercedes-Benz S320 Car Thermostat Replacement is $169 with $74 for parts and $95 for labor. Prices may vary depending on your location.

CarServiceEstimateShop/Dealer Price
1998 Mercedes-Benz S320L6-3.2LService typeCar Thermostat ReplacementEstimate$279.23Shop/Dealer Price$337.79 - $474.10
1995 Mercedes-Benz S320L6-3.2LService typeCar Thermostat ReplacementEstimate$242.05Shop/Dealer Price$296.35 - $419.79
1994 Mercedes-Benz S320L6-3.2LService typeCar Thermostat ReplacementEstimate$242.05Shop/Dealer Price$296.35 - $419.79
1997 Mercedes-Benz S320L6-3.2LService typeCar Thermostat ReplacementEstimate$242.05Shop/Dealer Price$296.31 - $419.72
1999 Mercedes-Benz S320L6-3.2LService typeCar Thermostat ReplacementEstimate$259.23Shop/Dealer Price$317.85 - $454.20
1996 Mercedes-Benz S320L6-3.2LService typeCar Thermostat ReplacementEstimate$242.05Shop/Dealer Price$296.35 - $419.79
Show example Mercedes-Benz S320 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.

Fast and easy service at your home or office

Backed by 12-month, 12.000-mile guarantee


Meet some of our expert Mercedes-Benz mechanics

Real customer reviews from Mercedes-Benz owners like you.

Excellent Rating

(16)

Rating Summary
15
0
0
1
0
15
0
0
1
0

Matthew

28 years of experience
1146 reviews
Matthew
28 years of experience
S320 1995 - Oxygen Sensor - Newport News, VA
Matt is the man! I appreciate every time he arrives. Best mechanic in this lifetime!

John

23 years of experience
879 reviews
John
23 years of experience
S320 1998 - Crankshaft Harmonic Balancer - La Marque, TX
As usual, John's work was stellar! He was punctual, took great care of my classic vehicle, and I'm back on the road! Thanks John for being an honest, hard-working mechanic that people can genuinely TRUST.

Pardeep

16 years of experience
1060 reviews
Pardeep
16 years of experience
S320 1997 - Engine is misfiring - San Jose, CA
Good service

Excellent Rating

(16)

Rating Summary
15
0
0
1
0
15
0
0
1
0
Number of Mercedes-Benz S320 services completed
176+
services done by our mechanics
TOTAL NUMBER OF EXPERT Mercedes-Benz MECHANICS
1000+
experts on our platform

Recent articles & questions

The Guide to Right-of-Way Laws in South Carolina
According According to the South Carolina Driver’s Manual (http://www.scdmvonline.com/DMVNew/forms/driver%20manual.pdf), “right of way” identifies who must yield and wait at intersections or anywhere else that it would be impossible for more than one vehicle or combination of pedestrians and vehicles to...
P0422 OBD-II Trouble Code: Main Catalyst Efficiency Below Threshold
P0422 means the catalytic converter is malfunctioning. Other causes may be oxygen sensors, fuel pressure regulator or a mass air flow sensor.
How to Replace Car Heater Hoses
Car heater hoses move coolant from the engine to the heater core and can overheat and break down if there is a coolant leak.

Key won't program

Greetings! Your truck is considerably new, therefore the key, ignition, and the immobilizer system will have to be reprogrammed by the special equipment that is only available at the dealership, or by a licensed locksmith.

Occasional shaking and loss of engine power

Unfortunately, I don't have repair information for this vehicle yet. I've seen online that other people have experienced a similar problem accompanied by a Check Engine Light and code P0606 (https://www.yourmechanic.com/article/p0606-obd-ii-trouble-code-pcm-processor-fault-by-jamahl-walker), which stands for Fuel Pump Control Module. The solution...

Engine rattles when I I turn on my engine for the first time in the morning. It seems like it only does it when it's cold

Hello. Most likely, the noise you describe is coming from one or both of the camshaft phasers on your engine. These devices which are operated by engine oil pressure, vary camshaft timing (relative to the crankshaft), enhancing engine performance and...

How can we help?

Our service team is available 7 days a week, Monday - Friday from 6 AM to 5 PM PST, Saturday - Sunday 7 AM - 4 PM PST.

1 (855) 347-2779 · hi@yourmechanic.com