The 2026 Lexus IS350 has 13 cooling system parts with verified fitment on this page — 6 part types and 9 brands, covering the 3.5L V6 engine. Each part includes a manufacturer part number and application notes.
The cooling system system on the 2026 Lexus IS350 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 (5 parts), Water Pump (3 parts) and Temperature Sender / Sensor (2 parts). The other 3 part types cover the remaining 3 parts.
The 2026 Lexus IS350 came with a single engine, the 3.5L V6, and every part is verified against it.
9 brands supply cooling system parts for the 2026 Lexus IS350, led by GATES (3 parts), VALVOLINE (2 parts) and AISIN (2 parts), plus 6 more brands. Quality grades include Standard Replacement and Economy.
A "Popular" badge means the source catalog flagged the part as frequently chosen for the 2026 Lexus IS350. 1 part has it: AISIN ACT002 (Coolant / Antifreeze). Each part number opens a page with every vehicle that part fits.
Coolant / Antifreeze
Economy
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| VALVOLINE | 719009 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Multi-Vehicle Yellow1 Gallon | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| AISIN Popular | ACT002 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | PinkHOAT | View on Amazon |
| AISIN | ACT002C | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Pink - Canada OnlyHOAT | View on Amazon |
| PENTOSIN | 8115209 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Pentofrost A41 Gallon | View on Amazon |
| VALVOLINE | 675130 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Asian Vehicle Red1 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.
5 Coolant / Antifreeze parts are listed for the 2026 Lexus IS350, from VALVOLINE, AISIN and PENTOSIN. AISIN ACT002 carries the "Popular" badge.
In the Economy grade, VALVOLINE supplies 1 part: the catalog's value-priced group. A representative part number is VALVOLINE 719009.
The Standard Replacement section lists 4 options from AISIN, PENTOSIN and VALVOLINE — built to original-equipment specification. AISIN ACT002 is listed in this group.
Part numbers include AISIN ACT002, VALVOLINE 719009 and AISIN ACT002C, among others listed above.
Coolant Reservoir Cap
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| GATES | 31541 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | OE TypeThreaded (Closed System) - (SAE Range 18-20 psi) | View on Amazon |
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.
This group shows a single part: GATES 31541.
Cooling Fan Control Module
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| GATES | FCM111 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | View on Amazon |
This table covers the Cooling Fan control modules.
This group shows a single part: GATES FCM111.
Radiator
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| TYC | 13776 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | View on Amazon |
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.
One part is listed for the 2026 Lexus IS350 — TYC 13776.
Temperature Sender / Sensor
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| NISSENS | 207157 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | F Sport or F Sport Design | View on Amazon |
| STANDARD MOTOR PRODUCTS | TX273 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | View on Amazon |
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.
2 Temperature Sender / Sensor parts are listed for the 2026 Lexus IS350, from NISSENS and STANDARD MOTOR PRODUCTS.
This group includes NISSENS 207157 and STANDARD MOTOR PRODUCTS TX273.
Water Pump
Economy
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| US MOTOR WORKS | US8150 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | F Sport or F Sport Design | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| DAYCO | DP2182 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | View on Amazon | |
| GATES | 43424 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | View on Amazon |
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.
3 Water Pump parts for the 2026 Lexus IS350 come from 3 brands — US MOTOR WORKS, DAYCO and GATES.
The Economy section: 1 option from US MOTOR WORKS. US MOTOR WORKS US8150 is listed in this group.
Standard Replacement: 2 parts, from DAYCO and GATES. A representative part number is DAYCO DP2182.
Listed part numbers: US MOTOR WORKS US8150, DAYCO DP2182 and GATES 43424.
Buying Cooling System Parts for a 2026 Lexus IS350
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.
- Confirm you have the 3.5L V6 engine — every part on this page is matched to it.
- 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 Water Pump .
Frequently Asked Questions
How many cooling system parts fit the 2026 Lexus IS350?
Our catalog currently lists 13 cooling system parts for the 2026 Lexus IS350 across 6 subcategories and 9 brands, covering the 3.5L V6 engine. Each part is matched to the engine(s) it fits.
What are the signs of cooling system problems on a 2026 Lexus IS350?
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 2026 Lexus IS350 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 2026 Lexus IS350?
Every part on this page is matched to the 3.5L V6 engine. 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 2026 Lexus IS350
Cooling System Parts for Other Lexus IS350 Years
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