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Your cart is empty. An ACDelco GM Original Equipment Engine Coolant Thermostat Kit comes with the thermostat and gasket you need to replace the thermostat in your vehicle, and is a GM-recommended replacement for your vehicle’s original component. The engine coolant thermostat controls the flow of coolant through the radiator to enable the engine to reach and maintain its normal operating temperature. This original equipment engine coolant thermostat kit has been manufactured to fit your specific GM vehicle, providing the same performance, durability, and service life you expect from General Motors.
Get the GM quality you know and trust with ACDelco GM Original Equipment Thermostats and Caps. Stay with the brand of parts your General Motors vehicle came with and get peace of mind that the fit, form, and function is up to the high standards and specifications of General Motors. ACDelco GM Original Equipment Thermostats and Caps are engineered for virtually every model of GM car, light duty truck, and sport utility vehicle.
ACDelco has a full line of high-quality thermostats and caps for nearly all GM vehicles on the road today. Through our GM Original Equipment and Professional, premium aftermarket product lines, our thermostats cover a wide range of designs and temperature ratings to meet your needs. We also offer GM OE and Professional, premium aftermarket fuel caps, radiator caps, and oil filler/breather caps to replace your worn GM Original Equipment.
mike
Reviewed in the United States on March 24, 2025
Fit me 2015 sierra 6.6
George
Reviewed in the United States on June 29, 2024
OEM replacement for my 2004.5 LLY Duramax Diesel engine. Operated flawlessly at the appropriate temperature.Don't forget there are two different thermostats needed! (Other ACDelco thermostat needed Part #131-163)
Tim Shaffstall
Reviewed in Australia on January 30, 2024
The part is as good as OEM
Sonic37
Reviewed in the United States on October 16, 2023
This was for my 2012 Duramax Diesel and is the rear thermostat in the thermostat housing. This is a 180 deg stat and the front one was 185 deg. I was unaware I had a problem until the truck set a code for low engine temperature. When you change this thermostat you need to change them both. This product came in a unmarked box with GM numbers on the top. It fit and looks like the OEM and so far is working fine.
ian s.
Reviewed in Canada on August 12, 2022
Awesome
Mr. MacGreggor
Reviewed in the United States on February 14, 2021
Identical replacement to the one that came out of my 2002 Chevy 2500HD Duramax. My original thermostat got stuck open, so it would take 30+ minutes for engine temp to get up over 165 degf, which is too cold for this engine to run. Once swapped out with this one ( and also swapped out the other thermostat - there are two thermostats side by side under the same housing in this engine, one opens at 182 and the other 185 degf), engine got up to temperature like it should in 10 minutes or so.Changing this was fairly easy. I drained the coolant by removing lower radiator hose (there is a drain Petcock on the bottom of the radiator, bit after breaking a few of these on other vehicles, I always just pull the lower radiator hose). Pulled intake resonance chamber, alternator positive cable, and unplugged a few wiring connections. After that, was able to pull thermostat housing, scrape clean with razor blade, and out back together. You don't need any gasket on the thermostat housing - rubber thermostat gasket supplied with parts is all you need.Refill coolant 50/50 dexron and distilled water then bled air out of engine block (there is an air bleed bolt on top of the thermostat housing you can use to do this). After air bled, started engine, let warm up until thermostats opened ( can feel upper radiator hose get warm). Once thermostats open, it will suck down about held the coolant reservoir, so make sure it's full.All in all, easy job. Took about 4 hrs. Fixed the issue.
Customer
Reviewed in Canada on December 19, 2021
Excellent product
Dad
Reviewed in Canada on January 18, 2021
Did the job for my 2015 LML
Wayne
Reviewed in Canada on July 30, 2020
Worked fine. Outer box was Delco, inner box plain white. Made in Japan
Jaybob
Reviewed in Canada on July 16, 2020
Exactly as described, arrived on time, installed as it should and works well.
Martin
Reviewed in Canada on July 12, 2020
and also twice cheaper then local dealer parts store. Took about 1 hour to replace it. You also need about 1 gallon of dex cool to top it
Andrew Novak
Reviewed in Canada on February 19, 2019
Works fine
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