2018 Buick Lacrosse Cooling System Parts

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. Read more

16 Coolant / Antifreeze parts are listed for the 2018 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.

This table covers the Coolant Air Bleed Hose pipes. Read more

GM GENUINE supplies the 3 Coolant Air Bleed Hose / Pipe parts for the 2018 Buick Lacrosse.

Listed part numbers: GM GENUINE 12653191, GM GENUINE 12717142 and GM GENUINE 26215476.

This table covers the hard pipes and extra hoses in the coolant circuit. Read more

One part is listed for the 2018 Buick Lacrosse — GM GENUINE 12669654.

This table covers the Coolant Hose Connector flanges. Read more

One part is listed for the 2018 Buick Lacrosse — FOUR SEASONS 86373.

This table covers the overflow / expansion tanks that hold extra coolant. Read more

5 Coolant Reservoir parts for the 2018 Buick Lacrosse come from 5 brands — DORMAN, GM GENUINE, GPD and 2 other brands. The "Popular" part is DORMAN 603861.

This group includes DORMAN 603861, GM GENUINE 23386455 and GPD 2411160 and the remaining parts above.

This table covers the caps on the overflow / expansion tank. Typical signs include a leak at the neck, a cap that will not hold pressure, or a missing tether. Match the pressure rating or thread in the notes — radiator, reservoir and fuel caps are not interchangeable. Read more

6 Coolant Reservoir Cap parts for the 2018 Buick Lacrosse come from 6 brands — DORMAN, SKP, AUTOTECNICA and 3 other brands. The "Popular" part is DORMAN 54218.

Listed part numbers: DORMAN 54218, SKP SK54218 and AUTOTECNICA GM0714619, plus the other parts above.

This table covers the adapters used to pressure-test this cooling system. Read more

3 Cooling System Tester Adapter parts are listed for the 2018 Buick Lacrosse, from MOTORAD and GATES.

This group includes GATES 31391, MOTORAD 3128 and MOTORAD 3127.

This table covers the Hose clamps. Read more

GM GENUINE supplies the 3 Hose Clamp parts for the 2018 Buick Lacrosse.

This group includes GM GENUINE 90572587, GM GENUINE 11548236 and GM GENUINE 13307373.

This table covers the radiators that dump engine heat to airflow through the core. Typical signs include overheating in traffic, a wet core, or coolant that disappears with no puddle. Replace the cap if it cannot hold the rated pressure, and bleed the system after the swap. Read more

8 Radiator parts are listed for the 2018 Buick Lacrosse, from CSF, TYC, AGILITY and 5 other brands. CSF 3898 carries the "Popular" badge.

This group includes CSF 3898, TYC 13574 and AGILITY 8013574 and the remaining parts above.

This table covers the caps that hold system pressure at the radiator or reservoir neck. Typical signs include a leak at the neck, a cap that will not hold pressure, or a missing tether. Match the pressure rating or thread in the notes — radiator, reservoir and fuel caps are not interchangeable. Read more

2 Radiator Cap parts are listed for the 2018 Buick Lacrosse, from ACDELCO and PROFESSIONAL PARTS SWEDEN.

This group includes ACDELCO RC124 and PROFESSIONAL PARTS SWEDEN 21342353.

This table covers the petcocks used to drain the radiator. Read more

This group shows a single part: GM GENUINE 23444086.

This table covers the fan assemblies (and clutches, where listed) that pull air through the radiator. Read more

4 Radiator Fan Assembly parts for the 2018 Buick Lacrosse come from 3 brands — GM GENUINE, TECHPRO and FOUR SEASONS.

The Economy section: 1 option from TECHPRO. TECHPRO GM3115320 is listed in this group.

Standard Replacement: 3 parts, from GM GENUINE and FOUR SEASONS. A representative part number is FOUR SEASONS 75971.

Part numbers include TECHPRO GM3115320, FOUR SEASONS 75971 and GM GENUINE 1581928, among others listed above.

This table covers the upper, lower and connecting hoses between radiator, engine and reservoir. Typical signs include swelling, cracks, a soft spot, or a leak at a clamp. Replace adjacent aged hoses while the system is drained — they share the same heat cycle. Read more

2 Radiator Hose parts for the 2018 Buick Lacrosse come from 2 brands — ACDELCO and GM GENUINE.

Part numbers include ACDELCO 26215481 and GM GENUINE 26215482.

This table covers the Radiator insulators. Read more

This group shows a single part: GM GENUINE 52493483.

This table covers the Radiator Mount bushings. Typical signs include a clunk over bumps, or a torn or walked-out bushing you can see. Press the new bushing square. A cocked bushing will tear in a few thousand miles. Read more

2 Radiator Mount Bushing parts for the 2018 Buick Lacrosse come from 2 brands — DORMAN and SKP.

This group includes DORMAN 926280 and SKP SK926280.

This table covers the seals at the Radiator. 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. Read more

This group shows a single part: GM GENUINE 23223151.

This table covers the Radiator Upper Air Baffle retainers and clips. Read more

This group shows a single part: DORMAN 961362.

This table covers the senders that report coolant temperature to the gauge or ECU. Typical signs include a gauge that sits on empty or overheat, or a lamp that does not match what the engine is doing. Rule out the cluster and the wiring before replacing the sender. Read more

11 Temperature Sender / Sensor parts are listed for the 2018 Buick Lacrosse, from STANDARD MOTOR PRODUCTS, GPD, DORMAN and 5 other brands. GM GENUINE 12650595 carries the "Popular" badge.

Economy: 6 parts, from GPD, DORMAN, HOLSTEIN and 2 other brands. A representative part number is DORMAN 926016.

The Standard Replacement section: 5 options from STANDARD MOTOR PRODUCTS, GM GENUINE, WALKER PRODUCTS and 1 other brand. GM GENUINE 12650595 is listed in this group.

This table covers the thermostats that open the coolant circuit at the specified temperature. Typical signs include slow warm-up, a gauge that climbs in traffic, or heat that never quite arrives. Replace the housing gasket with the thermostat and bleed the system so a trapped air pocket does not cook the new part. Read more

4 Thermostat parts for the 2018 Buick Lacrosse come from 2 brands — MOTORAD and FOUR SEASONS.

In the Heavy Duty grade, MOTORAD supplies 1 part: rated for severe service. A representative part number is MOTORAD 5860203.

Standard Replacement: 3 parts, from MOTORAD and FOUR SEASONS. A representative part number is FOUR SEASONS 86343.

This group includes MOTORAD 5860203, FOUR SEASONS 86343 and MOTORAD 860203 and the remaining parts above.

This table covers the seals at the thermostat housing and water outlet. 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. Read more

5 Thermostat / Thermostat Housing / Water Outlet Seal parts are listed for the 2018 Buick Lacrosse, from GM GENUINE, MAHLE / CLEVITE and FEL-PRO. GM GENUINE 12623519 carries the "Popular" badge.

Listed part numbers: GM GENUINE 12623519, FEL-PRO 36165 and GM GENUINE 12647181, plus the other parts above.

This table covers the housings and outlets the thermostat sits in. Read more

This group shows a single part: GM GENUINE 12741009.

This table covers the gaskets that seal the Water Inlet. Typical signs include seepage at the joint, a burnt-oil smell, or a leak that appears only after a long drive. Clean both flanges and torque in the sequence the notes or the manual call for. Read more

3 Water Inlet Gasket parts are listed for the 2018 Buick Lacrosse, from FEL-PRO, GM GENUINE and MAHLE / CLEVITE.

Listed part numbers: FEL-PRO 36167, GM GENUINE 12647400 and MAHLE / CLEVITE C33508.

This table covers the pumps that circulate coolant through the block and radiator. Typical signs include coolant at the weep hole, pulley play, or a growl from the front of the engine. Replace the thermostat and refill with the specified coolant whenever the pump comes off. Read more

7 Water Pump parts for the 2018 Buick Lacrosse come from 7 brands — FVP, US MOTOR WORKS, ACDELCO and 4 other brands. The "Popular" part is ACDELCO 2521038.

The Economy section: 2 options from FVP and US MOTOR WORKS. FVP US8148 is listed in this group.

Standard Replacement: 4 parts, from ACDELCO, GM GENUINE, FOUR SEASONS and 1 other brand. A representative part number is ACDELCO 2521038.

1 further part sits outside the graded sections, with the same engine-level match.

Part numbers include ACDELCO 2521038 and FVP US8148, among others listed above.

This table covers the gaskets between the water pump and the block or housing. Typical signs include seepage at the joint, a burnt-oil smell, or a leak that appears only after a long drive. Clean both flanges and torque in the sequence the notes or the manual call for. Read more

3 Water Pump Gasket parts are listed for the 2018 Buick Lacrosse, from ELRING, FEL-PRO and GM GENUINE.

Listed part numbers: ELRING 237160, FEL-PRO 36153 and GM GENUINE 2512072.

This table covers the Water Pump Inlet tubes. Read more

This group shows a single part: GM GENUINE 12671066.

This table covers the Water Pump pulleys. Typical signs include a growl or chirp that follows engine speed, or a pulley that will not spin freely by hand. Spin each pulley with the belt off. Roughness or play means replace it with the belt. Read more

One part is listed for the 2018 Buick Lacrosse — GM GENUINE 12652047.

This table covers the Water Pump Seal O-rings. Typical signs include a seep at a fitting or a housing that weeps after a service. Lube the new O-ring with the fluid it will see, and do not roll it into the groove. Read more

3 Water Pump Seal / O-Ring parts for the 2018 Buick Lacrosse come from GM GENUINE.

Part numbers include GM GENUINE 12646951, GM GENUINE 12646952 and GM GENUINE 12649987.