2026 Buick Envista 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

11 Coolant / Antifreeze parts for the 2026 Buick Envista come from 3 brands — PRESTONE, VALVOLINE and ACDELCO. The "Popular" part is PRESTONE AF2100.

In the Compatible With All Colors grade, PRESTONE supplies 1 part: grouped under the catalog's "Compatible With All Colors" designation — the notes column spells out what sets them apart. A representative part number is PRESTONE AF3055.

The Economy section lists 2 options from PRESTONE and VALVOLINE — the catalog's value-priced group. PRESTONE AF3100 is listed in this group.

In the Heavy Duty grade, PRESTONE supplies 1 part: rated for severe service. A representative part number is PRESTONE AFC12100.

In the Premium grade, PRESTONE supplies 2 parts: a step above OE specification in materials, tolerances or warranty terms. A representative part number is PRESTONE AF2100.

In the Standard Replacement grade, VALVOLINE, PRESTONE and ACDELCO supply 5 parts: built to original-equipment specification. A representative part number is ACDELCO 105027.

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

This group shows a single part: GM GENUINE 42869131.

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

2 Coolant Hose / Pipe parts for the 2026 Buick Envista come from GM GENUINE.

Listed part numbers: GM GENUINE 42732066 and GM GENUINE 55510882.

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. Read more

One part is listed for the 2026 Buick Envista — GM GENUINE 84958003.

This table covers the Coolant Hose retainers and clips. Read more

This group shows a single part: GM GENUINE 39017746.

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

One part is listed for the 2026 Buick Envista — GM GENUINE 13545831.

This table covers the Hose clamps. Read more

5 Hose Clamp parts for the 2026 Buick Envista come from GM GENUINE. The "Popular" part is GM GENUINE 13162312.

Listed part numbers: GM GENUINE 13162312, GM GENUINE 90572594 and GM GENUINE 11570871, plus the other parts above.

This table covers the intercoolers that cool turbo or supercharger charge air. Read more

This group shows a single part: TYC 18154.

This table covers the Intercooler Air Hose pipes. Read more

This group shows a single part: GM GENUINE 60008901.

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

This group shows a single part: GM GENUINE 42923276.

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

This group shows a single part: ACDELCO 13544913.

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

One part is listed for the 2026 Buick Envista — GM GENUINE 22790134.

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

One part is listed for the 2026 Buick Envista — GM GENUINE 42900629.

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

ACDELCO supplies both parts for the 2026 Buick Envista.

This group includes ACDELCO 42818135 and ACDELCO 42818136.

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

One part is listed for the 2026 Buick Envista — GM GENUINE 42766938.

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

2 Temperature Sender / Sensor parts for the 2026 Buick Envista come from 2 brands — HOLSTEIN and GM GENUINE.

The Economy section: 1 option from HOLSTEIN. HOLSTEIN 2CTS0125 is listed in this group.

Standard Replacement: 1 part, from GM GENUINE. A representative part number is GM GENUINE 12641073.

This group includes HOLSTEIN 2CTS0125 and GM GENUINE 12641073.

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

2 Thermostat / Thermostat Housing / Water Outlet Seal parts for the 2026 Buick Envista come from GM GENUINE.

Listed part numbers: GM GENUINE 55487536 and GM GENUINE 55487252.

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

One part is listed for the 2026 Buick Envista — GM GENUINE 1511137.

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

GM GENUINE supplies the 3 Water Pump parts for the 2026 Buick Envista.

This group includes GM GENUINE 25204277, GM GENUINE 13551861 and GM GENUINE 42828347.