Hummer H3 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

(8)

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

(8)

Car Thermostat Replacement Service

How much does a Car Thermostat Replacement cost?

On average, the cost for a Hummer H3 Car Thermostat Replacement is $343 with $105 for parts and $238 for labor. Prices may vary depending on your location.

CarServiceEstimateShop/Dealer Price
2009 Hummer H3V8-5.3LService typeCar Thermostat ReplacementEstimate$534.74Shop/Dealer Price$594.61 - $757.21
2006 Hummer H3L5-3.5LService typeCar Thermostat ReplacementEstimate$497.94Shop/Dealer Price$563.50 - $753.16
2009 Hummer H3L5-3.7LService typeCar Thermostat ReplacementEstimate$556.34Shop/Dealer Price$622.68 - $812.93
2008 Hummer H3L5-3.7LService typeCar Thermostat ReplacementEstimate$556.34Shop/Dealer Price$622.68 - $812.93
2007 Hummer H3L5-3.7LService typeCar Thermostat ReplacementEstimate$556.34Shop/Dealer Price$625.77 - $818.34
2008 Hummer H3V8-5.3LService typeCar Thermostat ReplacementEstimate$515.82Shop/Dealer Price$572.33 - $732.40
2010 Hummer H3V8-5.3LService typeCar Thermostat ReplacementEstimate$515.82Shop/Dealer Price$572.06 - $731.94
2010 Hummer H3L5-3.7LService typeCar Thermostat ReplacementEstimate$609.60Shop/Dealer Price$689.25 - $919.45
Show example Hummer H3 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 Hummer mechanics

Real customer reviews from Hummer owners like you.

Excellent Rating

(8)

Rating Summary
6
2
0
0
0
6
2
0
0
0

Desmond

18 years of experience
36 reviews
Desmond
18 years of experience
H3 2010 - Thermostat - Seaside, CA
Very punctual and professional. Mr. McIntyre did a fantastic job and I'll definitely use his services with any future repairs.

Marko

5 years of experience
21 reviews
Marko
5 years of experience
H3 2007 - Engine Mount - Encinitas, CA
hummer h3

Michael

35 years of experience
28 reviews
Michael
35 years of experience
H3 2008 - Evaporation Vent Solenoid - San Antonio, TX
Very professional

Michael

35 years of experience
28 reviews
Michael
35 years of experience
H3 2008 - Windshield Wiper Blade - San Antonio, TX
Very professional

Excellent Rating

(8)

Rating Summary
6
2
0
0
0
6
2
0
0
0
Number of Hummer H3 Car Thermostat Replacement services completed
88+
services done by our mechanics
TOTAL NUMBER OF EXPERT Hummer MECHANICS
200+
experts on our platform

Recent articles & questions

How Long Does a Brake Hose Last?
Vehicle Vehicle braking systems need brake fluid in order to function properly. There are a number of components on your car that help to supply the brake fluid needed when trying to bring a car to a top. The brake...
How to Replace a Muffler
As As cars and trucks travel down the road, they all have a different sound that emits from the exhaust. There are so many factors that come into play when it comes to the sound an exhaust makes: the design...
Cell Phones and Texting: Distracted Driving Laws in Delaware
The The State of Delaware has some of the strictest laws when it comes to using cell phones. In fact, drivers are banned from using pagers, PDAs, laptops, games, Blackberrys, portable computers, and cell phones while driving. Furthermore, drivers are...

Vacuum hose unhooked brake - 1990 Dodge D150

Hello. The vacuum hose (https://www.yourmechanic.com/services/brake-booster-vacuum-pump-replacement) from the brake booster goes into a tube on the intake. This tube is going to be about the same diameter as the hose and may need a clamp to secure it properly. The small...

Ct200 reliability

Hello. As the hybrid drive system on a CT200H is newer, it will be more refined and efficient. The HS250 is also an excellent hybrid, which held the title for most fuel efficient luxury vehicle, until it was replaced by...

Will using the brake pedal to reset the SBC counter work?

Good day Chibuikem, Thank you for contacting us today. We typically stick to the OEM repair tips and service ideas. According to MB, the right way to resolve this problem is through computer reset procedures - using an OBD-II diagnostic...

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