Mercedes-Benz ML250 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

(64)

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

(64)

Car Thermostat Replacement Service

How much does a Car Thermostat Replacement cost?

On average, the cost for a Mercedes-Benz ML250 Car Thermostat Replacement is $515 with $334 for parts and $180 for labor. Prices may vary depending on your location.

CarServiceEstimateShop/Dealer Price
2015 Mercedes-Benz ML250L4-2.1L Turbo DieselService typeCar Thermostat ReplacementEstimate$886.66Shop/Dealer Price$1086.96 - $1613.04
Show example Mercedes-Benz ML250 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

(64)

Rating Summary
60
2
0
0
2
60
2
0
0
2

Chris

22 years of experience
2223 reviews
Chris
22 years of experience
Mercedes-Benz ML250 L4-2.1L Turbo Diesel - Brake Pads Replacement (Front, Rear) - Trabuco Canyon, California
Great job, showed up on time, completed the work on time for far less than the dealership charges. What else is there to say.

Edwin

17 years of experience
8 reviews
Edwin
17 years of experience
Mercedes-Benz ML250 L4-2.1L Turbo Diesel - Oil Change - Cary, North Carolina
Edwin was awesome, not only was he knowledgeable about my car he is just an all around great guy and fun to chat with. I will definitely book Edwin again

Mohammed

9 years of experience
152 reviews
Mohammed
9 years of experience
Mercedes-Benz ML250 L4-2.1L Turbo Diesel - Brake Pads Replacement (Rear) - Cary, North Carolina
All good. Knowledgeable and friendly. Highly recommend!

Brett

25 years of experience
213 reviews
Brett
25 years of experience
Mercedes-Benz C300 V6-3.0L - Car Thermostat Replacement - Charlotte, North Carolina
Brett came by and did a super job. Less than half what the dealer wanted to charge

Excellent Rating

(64)

Rating Summary
60
2
0
0
2
60
2
0
0
2
Number of Mercedes-Benz Car Thermostat Replacement services completed
704+
services done by our mechanics
TOTAL NUMBER OF EXPERT Mercedes-Benz MECHANICS
1100+
experts on our platform

Recent articles & questions

How Long Does an Ignition Cable (Spark plug wires) Last?
The The ignition of a car is an essential part of a good running engine. Each time that you turn the key of your car over to crank it, the ignition wires will have to transfer the electricity from the...
How Long Does an Expansion Valve (Orifice Tube) Last?
Most Most cars nowadays have air conditioner. We love to have the feel of the cool air on those hot summer days, and we don't often think about what's involved in making sure the air conditioning runs properly, that is...
How To Buy Used Auto Parts
No matter how reliable a vehicle is, sooner or later most of us find ourselves in the market for auto parts (https://www.yourmechanic.com/parts). And whether it’s due to the vintage of your vehicle or the state of your bank account, you...

What tool do i need to take off the fuel pressure regulator

If the fuel pressure regulator is just held on by bolts, you should just need a ratchet or a wrench to remove it. Sometimes other parts will need to be removed in order to gain better access to a particular...

Does the whole steering column need to be replaced in order to replace a fried steering column module?

I would ask the mechanic for the exact part number of the electronic component that he believes has failed. Or, at least have him "name" the part and indicate where in the column assembly the part resides. The steering column...

Hi my engine is running rich. I've just replaced the float needle valves and checked the level in the carburettors (3) and the fuel level seems correct at 12mm. My next move is checking the fuel pump pressure because I believe there is still evidence of flooding and I am advised that the fuel pump may be delivering fuel at too high a pressure and pushing fuel through the needle valves. According to the manual the fuel pressure should be 1.5 - 2.5 psi. If the pressure is too high how do I adjust.

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