Hummer H3T 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

(9)

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

(9)

Car Thermostat Replacement Service

How much does a Car Thermostat Replacement cost?

On average, the cost for a Hummer H3T Car Thermostat Replacement is $303 with $103 for parts and $199 for labor. Prices may vary depending on your location.

CarServiceEstimateShop/Dealer Price
2010 Hummer H3TV8-5.3LService typeCar Thermostat ReplacementEstimate$447.64Shop/Dealer Price$520.18 - $690.55
2009 Hummer H3TV8-5.3LService typeCar Thermostat ReplacementEstimate$405.64Shop/Dealer Price$478.22 - $648.62
2009 Hummer H3TL5-3.7LService typeCar Thermostat ReplacementEstimate$429.40Shop/Dealer Price$507.92 - $696.13
2010 Hummer H3TL5-3.7LService typeCar Thermostat ReplacementEstimate$458.50Shop/Dealer Price$544.24 - $754.25
Show example Hummer H3T 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

(9)

Rating Summary
7
2
0
0
0
7
2
0
0
0

Colby

14 years of experience
66 reviews
Colby
14 years of experience
Hummer H3T L5-3.7L - Exterior Door Handle Replacement (Passenger Side Front) - Longmont, Colorado
Great service, quick and efficient. Wrong color door handle but I agreed to have it installed because I will paint it in the future.

Chuy

14 years of experience
398 reviews
Chuy
14 years of experience
Hummer H3 L5-3.7L - Thermostat - Chicago, Illinois
Chuy is very knowledgeable and takes time to explain why and what is needed. Highly recommend him.

Keith

30 years of experience
76 reviews
Keith
30 years of experience
Hummer H3 L5-3.5L - Car Thermostat Replacement - Youngtown, Arizona
Keith showed up on time. Answered all my questions. He put down a tarp in the work area to protect my driveway. He stuck to the quote and did not treat the mechanical work as a sales opportunity.

Maxwell

18 years of experience
390 reviews
Maxwell
18 years of experience
Hummer H3 L5-3.7L - Thermostat - Houston, Texas
Awesome and easy to talk about what going on my truck.

Excellent Rating

(9)

Rating Summary
7
2
0
0
0
7
2
0
0
0
Number of Hummer Car Thermostat Replacement services completed
99+
services done by our mechanics
TOTAL NUMBER OF EXPERT Hummer MECHANICS
200+
experts on our platform

Recent articles & questions

P0088 OBD-II Trouble Code: Fuel Rail/System Pressure - Too High
P0088 trouble code definition P0088 is Fuel Rail/System Pressure - Too High, indicating a fuel delivery system issue. This code is similar...
Veteran and Military Driver Laws and Benefits in Maine
The The state of Maine offers a number of benefits and perks for those Americans who have either served in an Armed Forces branch in the past, or are current active military members. Disabled veteran registration and driver license fee...
High-Paying Mobile Mechanic Jobs Near Me
Our comprehensive guide to finding great-paying mobile mechanic jobs near your location. Nationwide mobile auto technician job opportunities.

Check Engine light P0304.

The code P0304 points to a misfire on cylinder number 4. Ford also has a funny cylinder identification pattern, different from many makes, and a diagram should be consulted to determine which cylinder is the right one. The spark plugs...

Why does my #1 spark plug continue to burn up in my 2008 Ford F-150

Hello. If you continue to have the spark plug end burn up on just that cylinder then there is an issue with the mixture in that cylinder. It can be caused by a compression problem, carbon build up, or it...

My car is popping the code p0204 misfire

Hi there. You might want to read this article that explains what the P0204 OBD-II error code (https://www.yourmechanic.com/article/p0204-obd-ii-trouble-code-injector-circuit-malfunction-cylinder-4-by-spencer-clayton) is; what causes it and possible repair solutions.

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