How to replace the engine coolant thermostat (LY7) on Buick LaCrosse?

When replacing the engine coolant Thermostat (LY7) start by partially draining the cooling system. Don't divide the upper-level and lower intake manifolds. Take off the upper and lower intakes. Remove the thrustrod nut, the thrust rod guide bolt , and the upper ball stud then its nut and locking plate. Then, remove the Thermostat housing coolant inlet pipe and throw the pipe o-ring seal away. You need to remove the Thermostat bolts then pull the Thermostat and throw away the Thermostat seal. In the case of installation, mount the Thermostat with new Thermostat seal, and check bolts of the Thermostat to 10 n.m (89 lb in). Replace the coolant pipe with new seal and fasteners (1 and 3). Resecure the surge tank hose back to the Thermostat and reinstall the upper Intake Manifold to the lower Intake Manifold. Finally, fill the cooling system.

How to replace the thermostat on Buick Regal?

Begin Thermostat replacement starting with fuel injector sight shield removal. First drain some coolant from your engine's cooling system. Disconnect the throttle body air inlet duct with extreme caution. Use hose clamp pliers (J38185) to readjust the hose clamp which secures the water outlet housing then remove the Radiator Hose from this housing component. First uninstall the bolts from the water outlet housing before you can remove the water outlet housing together with its gasket. Check the mating surfaces of the Thermostat while you clean them. Start by positioning the Thermostat and placing the gasket into its correct spot then install the water outlet housing. Use rtv sealer (GM P/N 1052366 or equivalent) to install water outlet housing bolts before tightening them to 27 nm (20 ft. Lbs.). For reinstallation use hose clamp pliers (J38185) to place and secure the hose clamp on the water outlet housing. Reinstall the throttle body air inlet duct and procede to fill the cooling system before installing the fuel injector sight shield. Finally, inspect for leaks.

OEM Buick Thermostat

Engine Coolant Thermostat

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43 Thermostats found

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Buick Thermostat Housing Part Number: 12620112
$57.36 MSRP: $117.88
You Save: $60.52 (52%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: Housing, Engine Coolant Temperature; Thermostat Housing Cover; Housing, Engine Coolant Thermostat
- Replaces: 12567750, 12572988, 12602913
Fits the following Buick Models:
- Rainier | 2004-2007 | CXL, CXL Plus | 6 Cyl 4.2 L GAS
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Buick Thermostat Unit Part Number: 24506986
$18.12 MSRP: $34.02
You Save: $15.90 (47%)
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Product Specifications
- Other Name: Thermostat, Engine Coolant Temperature; Thermostat
- Replaces: 03037747, 10207375, 3037747, 24500253
Fits the following Buick Models:
- Century | 1987-1991 | Custom, Estate Wagon, Limited, Special | 6 Cyl 3.3 L GAS, 6 Cyl 3.8 L GAS
- Electra | 1987-1989 | Limited, Park Avenue, Park Avenue Ultra, T-Type | 6 Cyl 3.8 L GAS
- LeSabre | 1986-1991 | Base, Custom, Limited, T-Type | 6 Cyl 3.0 L GAS, 6 Cyl 3.8 L GAS
- Park Avenue | 1997, 1991 | Base, Ultra | 6 Cyl 3.8 L GAS
- Reatta | 1988-1990 | Base | 6 Cyl 3.8 L GAS
- Regal | 1997, 1990-1991 | Custom, GS, Gran Sport, LS, Limited | 6 Cyl 3.8 L GAS
- Riviera | 1995-1998, 1986-1990 | Base, Luxury, T-Type | 6 Cyl 3.8 L GAS
- Skylark | 1986-1991 | Base, Custom, Gran Sport, Limited, Luxury Edition | 6 Cyl 3.0 L GAS, 6 Cyl 3.3 L GAS
- Somerset | 1986-1987 | Custom, Limited, T-Type | 6 Cyl 3.0 L GAS
- Somerset Regal | 1985 | Base, Limited | 6 Cyl 3.0 L GAS
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Buick Thermostat Part Number: 12555290
$37.82 MSRP: $75.06
You Save: $37.24 (50%)
Ships in 1-3 Business Days
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Product Specifications
- Other Name: Thermostat, Engine Coolant Temperature
- Replaces: 10128336, 10223370
Fits the following Buick Models:
- Roadmaster | 1994-1996 | Base, Collector's Edition, Estate Wagon, Estate Wagon Collector's Edition, Limited, Limited Collector's Edition | 8 Cyl 5.7 L GAS
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Buick Thermostat Part Number: 89018168
$36.41 MSRP: $72.25
You Save: $35.84 (50%)
Ships in 1-3 Business Days
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Product Specifications
- Other Name: Engine Coolant Thermostat; Thermostat, Engine Coolant Temperature
- Replaces: 89017851
Fits the following Buick Models:
- Rainier | 2007 | CXL | 8 Cyl 5.3 L GAS
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Buick Thermostat Unit Part Number: 55492938
$58.80 MSRP: $110.41
You Save: $51.61 (47%)
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Product Specifications
- Other Name: Thermostat, Engine Coolant Temperature; Thermostat
Fits the following Buick Models:
- Cascada | 2016-2019 | Base, Premium, Sport Touring | 4 Cyl 1.6 L GAS
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Buick Thermostat Part Number: 10207373
$11.27 MSRP: $20.12
You Save: $8.85 (44%)
Ships in 1-3 Business Days
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Product Specifications
- Other Name: Thermostat, Engine Coolant Temperature
Fits the following Buick Models:
- Roadmaster | 1991-1993 | Base, Estate Wagon, Limited | 8 Cyl 5.0 L GAS, 8 Cyl 5.7 L GAS
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Buick 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
Fits the following Buick Models:
- Century | 1991 | Custom, Limited, Special | 6 Cyl 3.3 L GAS
- Park Avenue | 1991 | Base, Ultra | 6 Cyl 3.8 L GAS
- Regal | 1990-1991 | Custom, Gran Sport, Limited | 6 Cyl 3.8 L GAS
- Skylark | 1991 | Base, Custom, Gran Sport, Luxury Edition | 6 Cyl 3.3 L GAS
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Buick Thermostat Part Number: 3037747
$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
- Replaced by: 24506986
Fits the following Buick Models:
- Century | 1987-1990 | Custom, Estate Wagon, Limited | 6 Cyl 3.3 L GAS, 6 Cyl 3.8 L GAS
- Electra | 1987-1989 | Limited, Park Avenue, Park Avenue Ultra, T-Type | 6 Cyl 3.8 L GAS
- LeSabre | 1986-1991 | Base, Custom, Limited, T-Type | 6 Cyl 3.0 L GAS, 6 Cyl 3.8 L GAS
- Reatta | 1988-1990 | Base | 6 Cyl 3.8 L GAS
- Riviera | 1986-1990 | Luxury, T-Type | 6 Cyl 3.8 L GAS
- Skylark | 1986-1990 | Custom, Gran Sport, Limited, Luxury Edition | 6 Cyl 3.0 L GAS, 6 Cyl 3.3 L GAS
- Somerset | 1986-1987 | Custom, Limited, T-Type | 6 Cyl 3.0 L GAS
- Somerset Regal | 1985 | Base, Limited | 6 Cyl 3.0 L GAS
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Buick Thermostat Part Number: 3059793
$9.76 MSRP: $17.42
You Save: $7.66 (44%)
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Product Specifications
- Other Name: Thermostat Assembly-Engine Coolant
- Replaced by: 10192505
Fits the following Buick Models:
- Skyhawk | 1984-1989 | Custom, Limited, SE, Sport, T-Type | 4 Cyl 1.8 L GAS, 4 Cyl 2.0 L GAS
- Skylark | 1984-1988 | Custom, Limited | 4 Cyl 2.5 L GAS
- Somerset | 1986-1987 | Custom, Limited, T-Type | 4 Cyl 2.5 L GAS
- Somerset Regal | 1985 | Base, Limited | 4 Cyl 2.5 L GAS
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Buick Thermostat Part Number: 10101864
$2.04 MSRP: $18.11
You Save: $16.07 (89%)
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Product Specifications
- Other Name: Thermostat Assembly-Engine Coolant; Thermostat, Engine Coolant Temperature
Fits the following Buick Models:
- Century | 1991-1992 | Custom, Limited, Special | 4 Cyl 2.5 L GAS
- Skylark | 1991 | Base, Custom, Gran Sport, Luxury Edition | 4 Cyl 2.5 L GAS
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Buick Intake Manifold Part Number: 24577299
$16.76 MSRP: $29.91
You Save: $13.15 (44%)
Product Specifications
- Other Name: Thermostat, Engine Coolant Temperature; Thermostat Unit; Thermostat
- Replaces: 24576634, 10182377, 24577130
Fits the following Buick Models:
- Century | 1993-1996 | Custom, Limited, Special | 4 Cyl 2.2 L GAS
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Buick Thermostat Part Number: 1623547
Product Specifications
- Other Name: Thermostat Assembly-Engine Coolant; Thermostat, Engine Coolant Temperature
Fits the following Buick Models:
- Riviera | 1984-1985 | Base, Luxury, T-Type | 6 Cyl 3.8 L GAS, 6 Cyl 4.1 L GAS, 8 Cyl 5.0 L GAS, 8 Cyl 5.7 L DIESEL
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Buick Thermostat Part Number: 10045126
Product Specifications
- Other Name: Thermostat, Engine Coolant Temperature
Fits the following Buick Models:
- Skyhawk | 1987-1988 | Custom, Limited, SE, Sport, T-Type | 4 Cyl 2.0 L GAS
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Buick Thermostat Housing, Lower Part Number: 1620610
Product Specifications
- Other Name: Housing-Engine Coolant Thermostat Lower; Thermostat Housing Cover; Housing, Engine Coolant Thermostat
- Position: Lower
Fits the following Buick Models:
- Riviera | 1984-1985 | Base, Luxury, T-Type | 6 Cyl 3.8 L GAS, 6 Cyl 4.1 L GAS, 8 Cyl 5.0 L GAS, 8 Cyl 5.7 L DIESEL
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Buick Thermostat Housing Part Number: 12597257
Product Specifications
- Other Name: Housing, Engine Coolant Temperature; Thermostat Housing Cover; Water Outlet; Housing, Engine Coolant Thermostat
- Replaces: 12574355
Fits the following Buick Models:
- LaCrosse | 2005-2008 | CXS | 6 Cyl 3.6 L GAS
- Rendezvous | 2004-2006 | CX, CXL, CXL Plus, Ultra | 6 Cyl 3.6 L GAS
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Buick Thermostat Part Number: 55503988
$32.86 MSRP: $58.69
You Save: $25.83 (45%)
Product Specifications
- Other Name: Thermostat Assembly-Engine Coolant; Thermostat, Engine Coolant Temperature
- Replaced by: 25205415
Fits the following Buick Models:
- Encore GX | 2020-2024 | Essence, Preferred, Select | 3 Cyl 1.2 L GAS
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Buick Thermostat Part Number: 10207381
$22.68 MSRP: $40.52
You Save: $17.84 (45%)
Product Specifications
- Other Name: Thermostat Assembly-Engine Coolant; Thermostat, Engine Coolant Temperature
- Replaces: 03054228, 3054228
Fits the following Buick Models:
- Century | 1984-1985 | Custom, Estate, Estate Wagon, Limited, Olympia Limited | 6 Cyl 4.3 L DIESEL
- Electra | 1985 | Limited, Park Avenue, T-Type | 6 Cyl 3.0 L GAS, 6 Cyl 3.8 L GAS
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Buick Thermostat Part Number: 3041390
Product Specifications
- Other Name: Thermostat, Engine Coolant Temperature
Fits the following Buick Models:
- Century | 1984-1985 | Custom, Estate, Estate Wagon, Limited, Olympia Limited, T-Type | 6 Cyl 3.0 L GAS
- Electra | 1984-1985 | Limited, Park Avenue, T-Type | 6 Cyl 3.0 L GAS, 6 Cyl 3.8 L GAS, 6 Cyl 4.1 L GAS
- LeSabre | 1984-1985 | Collector's Edition, Custom, Limited | 6 Cyl 3.8 L GAS, 6 Cyl 4.1 L GAS
- Regal | 1984-1987 | Base, Limited | 6 Cyl 3.8 L GAS, 6 Cyl 4.1 L GAS, 6 Cyl 4.3 L DIESEL
- Riviera | 1984-1985 | Base, Luxury, T-Type | 6 Cyl 3.8 L GAS, 6 Cyl 4.1 L GAS, 8 Cyl 5.0 L GAS, 8 Cyl 5.7 L DIESEL
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Buick Thermostat Part Number: 22545290
Product Specifications
- Other Name: Thermostat, Engine Coolant Temperature
Fits the following Buick Models:
- Skylark | 1989-1993 | Base, Custom, Gran Sport, Limited, Luxury Edition | 4 Cyl 2.3 L GAS
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Buick Thermostat Part Number: 22538325
Product Specifications
- Other Name: Thermostat Assembly-Engine Coolant; Thermostat, Engine Coolant Temperature
Fits the following Buick Models:
- Electra | 1989 | Estate Wagon | 8 Cyl 5.0 L GAS
- LeSabre | 1988-1990 | Estate Wagon | 8 Cyl 5.0 L GAS
- Skylark | 1988 | Custom, Limited | 4 Cyl 2.3 L GAS
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Buick Thermostat

Choose OEM Thermostat, you're making the optimal decision for superior quality and perfect performance. You can feel confident because each component goes through stringent quality checks. Every part is carefully built to comply with Buick's factory specifications. You'll enjoy a smooth, worry-free installation that fits just right. At ChevyPartsDeal.com, you'll find it easy to get top-quality OEM Buick Thermostat. You can shop at highly competitive prices and protect your budget. All our genuine Buick parts include a dependable manufacturer's warranty. You'll also appreciate our straightforward return policy and swift delivery services for extra convenience.

Buick Thermostat maintains engine heat in balance and offers drivers confidence and ensures power on each trip. In pursuit of such a straightforward goal, since 1903 Buick has been seeking calm roads, calm cabins. The brand developed its reputation based on cushy suspensions, quiet tune, and spacious seats that shake off long distances. Throughout decades, it revised that comfort with turbo punch, sharp infotainment, and the aggressive Wildcat EV concept without losing its homely feel. In any Buick, drivers will be aware of subdued interiors, cool looks, and a ride that is adult but not at all stuffy. That mixture of the old and the new chops hold on to loyal fans and attract new customers who are not chasing an aesthetic. Concisely, the badge is a symbol of hassle-free traveling, truthful construction, and openness to new ideas. Crossovers to highways without much ado, the lineup drifts into everyday life. The Thermostat is placed close to the radiator, and it is a closed-loop gatekeeper; it reads the temperature of the coolant and opens or closes to regulate the flow of the block to maintain the block at its sweet point even when the air outside is either snow or desert scorch. Thermostats of these designs operate by using a wax pellet or bimetal strips which expand or contract with temperature, a basic movement that does not need electronics but is very dependable going mile after mile. A healthy Thermostat is able to avoid overcooling that destroys efficiency and overheating that distorts the metal, thus extending engine life with no bother to the driver.

Buick Thermostat Parts and Q&A

Thermostat Unit
12600171
Q: How to replace the engine coolant thermostat (LY7) on Buick LaCrosse?
A:
When replacing the engine coolant Thermostat (LY7) start by partially draining the cooling system. Don't divide the upper-level and lower intake manifolds. Take off the upper and lower intakes. Remove the thrustrod nut, the thrust rod guide bolt , and the upper ball stud then its nut and locking plate. Then, remove the Thermostat housing coolant inlet pipe and throw the pipe o-ring seal away. You need to remove the Thermostat bolts then pull the Thermostat and throw away the Thermostat seal. In the case of installation, mount the Thermostat with new Thermostat seal, and check bolts of the Thermostat to 10 n.m (89 lb in). Replace the coolant pipe with new seal and fasteners (1 and 3). Resecure the surge tank hose back to the Thermostat and reinstall the upper Intake Manifold to the lower Intake Manifold. Finally, fill the cooling system.
Thermostat Unit
24505924
Q: How to replace the thermostat on Buick Regal?
A:
Begin Thermostat replacement starting with fuel injector sight shield removal. First drain some coolant from your engine's cooling system. Disconnect the throttle body air inlet duct with extreme caution. Use hose clamp pliers (J38185) to readjust the hose clamp which secures the water outlet housing then remove the Radiator Hose from this housing component. First uninstall the bolts from the water outlet housing before you can remove the water outlet housing together with its gasket. Check the mating surfaces of the Thermostat while you clean them. Start by positioning the Thermostat and placing the gasket into its correct spot then install the water outlet housing. Use rtv sealer (GM P/N 1052366 or equivalent) to install water outlet housing bolts before tightening them to 27 nm (20 ft. Lbs.). For reinstallation use hose clamp pliers (J38185) to place and secure the hose clamp on the water outlet housing. Reinstall the throttle body air inlet duct and procede to fill the cooling system before installing the fuel injector sight shield. Finally, inspect for leaks.