Mercedes-Benz GL450 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

(3)

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

(3)

Car Thermostat Replacement Service

How much does a Car Thermostat Replacement cost?

On average, the cost for a Mercedes-Benz GL450 Car Thermostat Replacement is $355 with $184 for parts and $171 for labor. Prices may vary depending on your location.

CarServiceEstimateShop/Dealer Price
2007 Mercedes-Benz GL450V8-4.7LService typeCar Thermostat ReplacementEstimate$583.70Shop/Dealer Price$695.88 - $991.93
2014 Mercedes-Benz GL450V8-4.7L TurboService typeCar Thermostat ReplacementEstimate$539.36Shop/Dealer Price$649.49 - $939.30
2016 Mercedes-Benz GL450V6-3.0L TurboService typeCar Thermostat ReplacementEstimate$904.14Shop/Dealer Price$1114.63 - $1647.49
2011 Mercedes-Benz GL450V8-4.7LService typeCar Thermostat ReplacementEstimate$547.70Shop/Dealer Price$659.87 - $955.91
2009 Mercedes-Benz GL450V8-4.7LService typeCar Thermostat ReplacementEstimate$547.70Shop/Dealer Price$659.94 - $956.03
2013 Mercedes-Benz GL450V8-4.7L TurboService typeCar Thermostat ReplacementEstimate$539.36Shop/Dealer Price$649.49 - $939.30
2015 Mercedes-Benz GL450V6-3.0L TurboService typeCar Thermostat ReplacementEstimate$916.64Shop/Dealer Price$1126.53 - $1658.95
2012 Mercedes-Benz GL450V8-4.7LService typeCar Thermostat ReplacementEstimate$556.70Shop/Dealer Price$669.34 - $965.72
Show example Mercedes-Benz GL450 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

(3)

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

Excellent Rating

(3)

Rating Summary
2
0
0
0
1
2
0
0
0
1
Number of Mercedes-Benz GL450 Car Thermostat Replacement services completed
33+
services done by our mechanics
TOTAL NUMBER OF EXPERT Mercedes-Benz MECHANICS
1100+
experts on our platform

Recent articles & questions

Does Gasoline Expire?
Gasoline Gasoline does expire if it is left unused for a long period of time. The problem with gas is its volatility. A volatile substance is prone to separating and vaporizing. This is especially bad if the fuel vapor has...
How to Fight a Speeding Ticket
Speeding ticket can be avoided before you get a ticket or they can be contested in court. Stay calm and be polite to beat a speeding ticket.
How to Replace a Vacuum Brake Booster
The vacuum brake booster generates extra force for car brakes. If your car is hard to stop or wants to shut off, replace your brake booster.

Slow leak in tire

Hello. It is common to lose a small amount of air over time. Usually about a pound or two of pressure a month is normal. If it is leaking faster than that then it amy have something stuck in the...

car has bad smell when I run it coming from under the hood

For this diagnosis it would've been helpful if the smell was described in more detail to help you with the problem. For example, the smell of a dead animal versus the smell of burnt oil. If you cannot describe it...

Blocked exhaust

Hi there - no, blocking the exhaust will not damage valves or lifter. It will, however, cause your engine to lose power quickly (minutes), depending on how severely the exhaust is blocked. Think of the engine as an air pump,...

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