This page lists 23 cooling system parts for the 2009 Buick Lacrosse, across 4 part types, covering both the 3.8L V6 and the 5.3L V8. Every part shows its brand, manufacturer part number and fitment notes.
The cooling system system on the 2009 Buick Lacrosse keeps operating temperature in the narrow band the engine was designed for, from radiator and water pump to thermostat and hoses. The largest groups are Coolant / Antifreeze (16 parts), Coolant Hose / Pipe Seal (4 parts) and Coolant Hose / Pipe (2 parts). The other 1 part type covers the remaining 1 part.
The 2009 Buick Lacrosse was sold with both the 3.8L V6 and the 5.3L V8. Every part on this page is engine-specific. Each part shows which engine(s) it fits.
10 brands supply cooling system parts for the 2009 Buick Lacrosse, led by PRESTONE (6 parts), GM GENUINE (4 parts) and PEAK (3 parts), plus 7 more brands. Quality grades include Standard Replacement, Economy and Premium.
A "Popular" badge means the source catalog flagged the part as frequently chosen for the 2009 Buick Lacrosse. 4 parts have it, including FVP MV5050GAL (Coolant / Antifreeze) and PRESTONE AF2100 (Coolant / Antifreeze). Each part number opens a page with every vehicle that part fits.
Coolant / Antifreeze
Compatible With All Colors
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| PRESTONE Fits: 3.8L V6 | AF3055 | 🇺🇸 US | Prime YellowAll Vehicles | View on Amazon |
Economy
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| FVP Popular Fits: 3.8L V6 | MV5050GAL | 🇺🇸 US | Extended LifeAll Makes / All Models | View on Amazon |
| PEAK Fits: 3.8L V6 | BQA1GAL | 🇺🇸 US | Blue Mountain Long LifeAll Vehicle | View on Amazon |
| PRESTONE Fits: 3.8L V6 | AF3100 | 🇺🇸 US | Prime Yellow - All VehiclesExtended Life | View on Amazon |
| VALVOLINE Fits: 3.8L V6 | 719009 | 🇺🇸 US | Multi-Vehicle Yellow1 Gallon | View on Amazon |
Premium
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| PRESTONE Popular Fits: 3.8L V6 | AF2100 | 🇺🇸 US | All Vehicles10yr/300k mi | View on Amazon |
| PEAK Fits: 3.8L V6 | PKP1GAL | 🇺🇸 US | All Vehicles Antifreeze1 Gallon | View on Amazon |
| PEAK Fits: 3.8L V6 | PXA1GAL | 🇺🇸 US | Global Lifetime1 Gallon | View on Amazon |
| PRESTONE Fits: 3.8L V6 | AFMAX | 🇺🇸 US | Max Universal1 Gallon | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| ACDELCO Popular Fits: 3.8L V6 | 105027 | 🇺🇸 US | DEX-Cool Extended LifeDexcool (with DE-Ionized Water) (with Bitterant) 1 Gallon | View on Amazon |
| VALVOLINE Popular Fits: 3.8L V6 | ZXEL1 | 🇺🇸 US | Dex-Cool Orange1 Gallon | View on Amazon |
| AISIN Fits: 3.8L V6 | ACD005 | 🇺🇸 US | OrangeOAT | View on Amazon |
| FVP Fits: 3.8L V6 | DEX5050GAL | 🇺🇸 US | Extended Life Blend1 Gallon | View on Amazon |
| PRESTONE Fits: 3.8L V6 | AF3400 | 🇺🇸 US | Prime OrangeOrange Compatible | View on Amazon |
| PRESTONE Fits: 3.8L V6 | AF850 | 🇺🇸 US | DEX-Cool Extended Life1 Gallon | View on Amazon |
| VALVOLINE Fits: 3.8L V6 | 888374 | 🇺🇸 US | American Vehicle Orange1 Gallon | View on Amazon |
This table covers the engine coolants and antifreeze formulations specified for this cooling system. Typical signs include a rising temperature gauge, rusty or sludged coolant, or a heater that blows cold. Use the chemistry named in the notes. Mixing silicate, OAT and HOAT formulas can gel in the radiator.
16 Coolant / Antifreeze parts are listed for the 2009 Buick Lacrosse, from PRESTONE, PEAK, VALVOLINE and 3 other brands. FVP MV5050GAL carries the "Popular" badge.
The Compatible With All Colors section lists 1 option from PRESTONE — grouped under the catalog's "Compatible With All Colors" designation — the notes column spells out what sets them apart. PRESTONE AF3055 is listed in this group.
In the Economy grade, FVP, PEAK, PRESTONE and 1 other brand supply 4 parts: the catalog's value-priced group. A representative part number is FVP MV5050GAL.
The Premium section lists 4 options from PRESTONE and PEAK — a step above OE specification in materials, tolerances or warranty terms. PRESTONE AF2100 is listed in this group.
The Standard Replacement section lists 7 options from VALVOLINE, PRESTONE, ACDELCO and 2 other brands — built to original-equipment specification. ACDELCO 105027 is listed in this group.
Coolant Hose / Pipe
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| GM GENUINE Fits: 3.8L V6 | 12565082 | 🇺🇸 US 🇨🇦 CA | Thermostat Bypass | View on Amazon |
| GM GENUINE Fits: 3.8L V6 | 24503423 | 🇺🇸 US 🇨🇦 CA | to lower intake manifold.Thermostat Bypass | View on Amazon |
This table covers the hard pipes and extra hoses in the coolant circuit.
GM GENUINE supplies both parts for the 2009 Buick Lacrosse.
Part numbers include GM GENUINE 12565082 and GM GENUINE 24503423.
Coolant Hose / Pipe Seal
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| FEL-PRO Fits: 3.8L V6 | 36021 | 🇺🇸 US | Water Bypass Seal | View on Amazon |
| GM GENUINE Fits: 3.8L V6 | 1534066 | 🇺🇸 US 🇨🇦 CA | 0.674" Diameter | View on Amazon |
| GM GENUINE Fits: 3.8L V6 | 24502846 | 🇺🇸 US 🇨🇦 CA | Elbow to Front Cover0.799' ID | View on Amazon |
| MAHLE / CLEVITE Fits: 3.8L V6 | C31274 | 🇺🇸 US | Paper | View on Amazon |
This table covers the seals at the Coolant Hose / Pipe. Typical signs include a wet housing, a drip after sitting, or fluid flung off a rotating shaft. Fix the surface the seal rides on. A new seal on a grooved shaft will leak again.
4 Coolant Hose / Pipe Seal parts for the 2009 Buick Lacrosse come from 3 brands — GM GENUINE, FEL-PRO and MAHLE / CLEVITE.
This group includes FEL-PRO 36021, GM GENUINE 1534066 and GM GENUINE 24502846 and the remaining parts above.
Coolant Hose Connector / Flange
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| FOUR SEASONS Fits: 3.8L V6 | 86500 | 🇺🇸 US | Coolant Coupling | View on Amazon |
This table covers the Coolant Hose Connector flanges.
One part is listed for the 2009 Buick Lacrosse — FOUR SEASONS 86500.
Buying Cooling System Parts for a 2009 Buick Lacrosse
On this vehicle, the cooling system system keeps operating temperature in the narrow band the engine was designed for, from radiator and water pump to thermostat and hoses.
- Match the engine first. Every cooling system part here is engine-specific; each row shows which engine(s) it fits.
- Read the notes on each row for position, trim and spec qualifiers before you order.
- Where labor overlaps, replace the thermostat and refill with fresh coolant whenever you change a water pump or radiator; original hoses on an older vehicle are on borrowed time.
- Cross-reference the manufacturer part number against your old part or a service-manual listing.
Start with the largest groups on this page: Coolant / Antifreeze and Coolant Hose / Pipe Seal .
Frequently Asked Questions
How many cooling system parts fit the 2009 Buick Lacrosse?
Our catalog currently lists 23 cooling system parts for the 2009 Buick Lacrosse across 4 subcategories and 10 brands, covering both the 3.8L V6 and the 5.3L V8. Each part is matched to the engine(s) it fits.
Do cooling system parts differ between 2009 Buick Lacrosse engines?
Yes. Every cooling system part on this page is engine-specific. Each row shows which engine(s) it fits — use the filter at the top to hide the rest. If you're unsure which engine you have, check the emissions label under the hood or the 8th character of your VIN.
What are the signs of cooling system problems on a 2009 Buick Lacrosse?
Common symptoms include a rising temperature gauge in traffic, sweet-smelling steam, crusty deposits around hose clamps, or a heater that blows cold. If you notice any of these, identify the affected subcategory above and cross-reference the part numbers listed.
What should I replace at the same time?
Where labor overlaps, replace the thermostat and refill with fresh coolant whenever you change a water pump or radiator; original hoses on an older vehicle are on borrowed time.
What do the market flags (US, CA, MX) on each part mean?
They show the market for which the manufacturer published application data for that part — where the vehicle was first sold, not where the part was made. If your 2009 Buick Lacrosse was originally sold in the US, the safest choice is a part marked for the US market.
How do I make sure a part fits my 2009 Buick Lacrosse?
First match the engine — each row shows which engine(s) the part fits. Then replace coolant with the exact specification the manufacturer calls for — mixing chemistries can gel and block small passages. The notes column carries position and trim qualifiers where they apply.
Other Parts for the 2009 Buick Lacrosse
Cooling System Parts for Other Buick Lacrosse Years
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Manufacturer names, model designations and part numbers are used for identification and fitment reference only. AutoFactsDB is an independent catalog and is not affiliated with, endorsed by, or sponsored by any vehicle manufacturer displayed on this page.