Mercedes-Benz S430 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

(87)

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

(87)

Car Thermostat Replacement Service

How much does a Car Thermostat Replacement cost?

On average, the cost for a Mercedes-Benz S430 Car Thermostat Replacement is $370 with $118 for parts and $252 for labor. Prices may vary depending on your location.

CarServiceEstimateShop/Dealer Price
2000 Mercedes-Benz S430V8-4.3LService typeCar Thermostat ReplacementEstimate$523.10Shop/Dealer Price$595.47 - $787.05
2003 Mercedes-Benz S430V8-4.3LService typeCar Thermostat ReplacementEstimate$506.88Shop/Dealer Price$573.68 - $761.09
2001 Mercedes-Benz S430V8-4.3LService typeCar Thermostat ReplacementEstimate$506.88Shop/Dealer Price$573.76 - $761.23
2004 Mercedes-Benz S430V8-4.3LService typeCar Thermostat ReplacementEstimate$497.96Shop/Dealer Price$562.61 - $743.38
2006 Mercedes-Benz S430V8-4.3LService typeCar Thermostat ReplacementEstimate$506.88Shop/Dealer Price$578.40 - $769.35
2002 Mercedes-Benz S430V8-4.3LService typeCar Thermostat ReplacementEstimate$506.88Shop/Dealer Price$574.20 - $762.00
2005 Mercedes-Benz S430V8-4.3LService typeCar Thermostat ReplacementEstimate$506.88Shop/Dealer Price$573.81 - $761.31
Show example Mercedes-Benz S430 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

(87)

Rating Summary
83
2
1
0
1
83
2
1
0
1

Joshua

28 years of experience
709 reviews
Joshua
28 years of experience
Mercedes-Benz S430 V8-4.3L - UberX Inspection and Oil Change Package - El Sobrante, California
Best mechanic there is in the entire Bay Area will recommend him and your mechanic to everyone I know and I'm a pastor so I know allot of people lol I finally found a good mechanic and her through your mechanic . Please send us no one but Joshua he's stuck with us now lol

Keven

8 years of experience
187 reviews
Keven
8 years of experience
Mercedes-Benz S430 V8-4.3L - Car is not starting - Kent, Washington
Very friendly polite knowledgeable and courteous.

Levi

10 years of experience
64 reviews
Levi
10 years of experience
Mercedes-Benz S430 V8-4.3L - Brakes, Steering and Suspension Inspection - Oklahoma City, Oklahoma
Very nice, efficient, professional and communicative

Miguel

36 years of experience
258 reviews
Miguel
36 years of experience
Mercedes-Benz S430 V8-4.3L - Fuel Filter - Miami, Florida
Very professional work on my Mercedes S430. Would recommend to anyone.

Excellent Rating

(87)

Rating Summary
83
2
1
0
1
83
2
1
0
1
Number of Mercedes-Benz S430 services completed
957+
services done by our mechanics
TOTAL NUMBER OF EXPERT Mercedes-Benz MECHANICS
1100+
experts on our platform

Recent articles & questions

P0809 OBD-II Trouble Code: Clutch Position Sensor Circuit Intermittent Malfunction
P0809 code means there is an malfunction within the clutch position sensor circuit often due too a defective sensor or corroded wiring/connecters.
Understanding the Chrysler Oil Change Indicator and Service Indicator Lights
Car symbols, or dashboard lights, are a car service reminder. The Chrysler Oil Change Indicator lets you know when and what service your car needs.
How to Register a Car in South Dakota
One One of the most rewarding and stressful situations that a person can go through is moving. If you are planning a move to the South Dakota area, then you need to make sure you take steps to comply with...

Car starting, idling, and then stalling

Hello. If the engine will only run for a short period of time then it may have a failing fuel pump or an electrical issue. Being that you stripped out the fuel filter connections, the metal lines may need to...

Tried to reset key fob didn't work now immobiliser activated.

The Immobilizer System indicator light comes on for a few seconds, then it goes out when you turn the ignition switch to the 'ON' position. The Immobilizer System light will blink if it cannot recognize the key coding. Try reprogramming...

Anti-theft device for ignition will not allow the engine to run, and the security light is on.

Hi there. You could remove the battery cables for 13 minutes and then put them back on. This will clear out the computer and have it relearn itself. Now if the light still comes on, then the security controller will...

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