How to replace the thermostat in a 3.8L engine on Buick Regal?

Your tool list for Thermostat replacement in a 3.8l engine should begin with hose clamp pliers (J 38185). Start by taking off the fuel injector sight shield while partially draining engine coolant out of the coolant system. The next step involves separating the throttle body air inlet duct from its installation. Use hose clamp pliers (J 38185) to manipulate the water outlet housing hose clamp positioning before removing the Radiator Hose. Start by removing bolts from the water outlet housing before you detach the water outlet housing combined with its gasket to expose the Thermostat. Examine and prepared the mating surfaces after removing the Thermostat. Reinstall the new Thermostat together with a gasket after positioning them. Then replace the water outlet housing as an installation step. Wash and dry each water outlet housing bolt prior to applying rtv sealer gm p/n 1052366 or equivalent before securing them with 27 nm (20 ft. Lbs.) torque. Reposition the Radiator Hose on the water outlet housing by using hose clamp pliers (J 38185) followed by clamp installation. Finish your installation by adding the throttle body air inlet duct before filling your cooling system and reinstalling the fuel injector sight shield while checking for leaks throughout the process.

OEM Buick Regal Thermostat

Engine Coolant Thermostat

Select Vehicle by Model
Select Vehicle by VIN

Select Vehicle by Model

Make

Model

Year

Select Vehicle by VIN

For the most accurate results, select vehicle by your VIN (Vehicle Identification Number).

9 Thermostats found

View related parts
Buick Regal Thermostat Unit Part Number: 24506986
$18.12 MSRP: $34.02
You Save: $15.90 (47%)
Ships in 1 Business Day
ADD TO CART
Product Specifications
- Other Name: Thermostat, Engine Coolant Temperature; Thermostat
- Replaces: 03037747, 10207375, 3037747, 24500253
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 1997 Buick Regal | GS, LS | 6 Cyl 3.8 L GAS
- 1990-1991 Buick Regal | Custom, Gran Sport, Limited | 6 Cyl 3.8 L GAS
View related parts
Buick Regal Thermostat Unit Part Number: 24505924
$24.47 MSRP: $48.56
You Save: $24.09 (50%)
ADD TO CART
Product Specifications
- Other Name: Thermostat Assembly-Engine Coolant (W/Gasket); Thermostat; Thermostat, Engine Coolant Temperature
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 1992-2004 Buick Regal | 25th Anniversary Edition, Custom, Gran Sport, GS, GSE, Limited, LS, LSE, Olympic Gold Edition | 6 Cyl 3.8 L GAS
View related parts
Buick Regal Thermostat Part Number: 24507563
$20.53 MSRP: $40.74
You Save: $20.21 (50%)
ADD TO CART
Product Specifications
- Other Name: Thermostat, Engine Coolant Temperature
- Replaced by: 19435095
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 1992-1996 Buick Regal | Custom, Limited | 6 Cyl 3.1 L GAS
View related parts
Buick Regal Thermostat Housing, Green Line Part Number: 12597172
$98.01 MSRP: $201.41
You Save: $103.40 (52%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Housing, Engine Coolant Temperature; Engine Coolant Thermostat Housing; Thermostat Housing Cover; Water Manifold; Housing, Engine Coolant Thermostat
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2011-2017 Buick Regal | Base, CXL, Premium | 4 Cyl 2.4 L FLEX, 4 Cyl 2.4 L GAS, 4 Cyl 2.4 L MILD HYBRID EV-GAS (MHEV)
View related parts
Buick Regal Thermostat, Green Line Part Number: 12622410
$69.04 MSRP: $153.83
You Save: $84.79 (56%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Thermostat Assembly-Engine Coolant; Thermostat Kit, Engine Coolant Temperature; Thermostat, Engine Coolant Temperature
- Replaces: 21018811, 55350941, 90537453, 12615097
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2011-2017 Buick Regal | Base, CXL, GS, Premium | 4 Cyl 2.0 L FLEX, 4 Cyl 2.4 L FLEX, 4 Cyl 2.4 L GAS, 4 Cyl 2.4 L MILD HYBRID EV-GAS (MHEV)
View related parts
Buick Regal Thermostat Part Number: 24500253
$18.12 MSRP: $34.02
You Save: $15.90 (47%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Thermostat, Engine Coolant Temperature
- Replaced by: 24506986
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 1990-1991 Buick Regal | Custom, Gran Sport, Limited | 6 Cyl 3.8 L GAS
View related parts
Buick Regal Thermostat Housing Part Number: 12605853
$99.70 MSRP: $204.86
You Save: $105.16 (52%)
ADD TO CART
Product Specifications
- Other Name: Housing, Engine Coolant Temperature; Thermostat Housing Cover; Housing, Engine Coolant Thermostat
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2011-2013 Buick Regal | CXL, GS, Premium | 4 Cyl 2.0 L FLEX
View related parts
Buick Regal Thermostat Housing Part Number: 25201447
$67.81 MSRP: $139.32
You Save: $71.51 (52%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Housing, Engine Coolant Temperature; Thermostat Housing Cover; Thermostat Gasket; Thermostat; Thermostat Cover; Water Inlet; Housing, Engine Coolant Thermostat
- Replaces: 12651603
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2014-2017 Buick Regal | Base, GS, Premium, Sport Touring | 4 Cyl 2.0 L GAS
View related parts
Buick Regal Thermostat Part Number: 3041390
Product Specifications
- Other Name: Thermostat, Engine Coolant Temperature
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 1984-1987 Buick Regal | Base, Limited | 6 Cyl 3.8 L GAS, 6 Cyl 4.1 L GAS, 6 Cyl 4.3 L DIESEL

Buick Regal Thermostat

Want to cut long-term maintenance and repair costs? Choose OEM Thermostat. Those parts deliver top durability you can trust. On our site, you'll find a huge catalog of genuine Buick Regal parts. Prices are unbeatable, so you can keep more in your pocket. Every OEM Buick Regal Thermostat includes a manufacturer's warranty. You can also get an easy return policy that keeps buying risk free. Fast delivery, get your car on the road quickly. It's simple to search, compare, and order. Stop guessing about quality or fit. Order today and save with parts that last.

The Thermostat of the Buick Regal car helps control the temperature of the engine for the vehicle to perform as expected. Usually placed at the vicinity of the radiator, the thermostat features as closed loop controllers whose main job is to regulate the set temperature range. There has been the usage of various categories of thermostats in vehicles, some of which are the mechanical thermostat such as, bimetallic strips, wax pellets, and pneumatic thermostats that act through air filled control tubes. These operate through the use of switching of heating or cooling appliances or management of heat transfer fluids. In a Buick Regal vehicle, the thermostat play a significant role of regulating the temperature of the engine hence increasing efficiency and comfort in use.

Buick Regal Thermostat Parts Questions & Experts Answers

Thermostat Unit
24505924
Q: How to replace the thermostat in a 3.8L engine on Buick Regal?
A:
Your tool list for Thermostat replacement in a 3.8l engine should begin with hose clamp pliers (J 38185). Start by taking off the fuel injector sight shield while partially draining engine coolant out of the coolant system. The next step involves separating the throttle body air inlet duct from its installation. Use hose clamp pliers (J 38185) to manipulate the water outlet housing hose clamp positioning before removing the Radiator Hose. Start by removing bolts from the water outlet housing before you detach the water outlet housing combined with its gasket to expose the Thermostat. Examine and prepared the mating surfaces after removing the Thermostat. Reinstall the new Thermostat together with a gasket after positioning them. Then replace the water outlet housing as an installation step. Wash and dry each water outlet housing bolt prior to applying rtv sealer gm p/n 1052366 or equivalent before securing them with 27 nm (20 ft. Lbs.) torque. Reposition the Radiator Hose on the water outlet housing by using hose clamp pliers (J 38185) followed by clamp installation. Finish your installation by adding the throttle body air inlet duct before filling your cooling system and reinstalling the fuel injector sight shield while checking for leaks throughout the process.