This page lists 13 cooling system parts for the 2026 Lexus RX350, across 3 part types, covering the 2.4L L4 Turbocharged engine. Every part shows its brand, manufacturer part number and fitment notes.
On the 2026 Lexus RX350, 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. All 13 listed parts are Coolant / Antifreeze (5 parts), Temperature Sender / Sensor (4 parts) and Water Pump (4 parts).
The 2026 Lexus RX350 came with a single engine, the 2.4L L4 Turbocharged, and every part is verified against it.
9 brands supply cooling system parts for the 2026 Lexus RX350, led by NISSENS (3 parts), VALVOLINE (2 parts) and STANDARD MOTOR PRODUCTS (2 parts), plus 6 more brands. Quality grades include Standard Replacement, Economy and Heavy Duty.
A "Popular" badge means the source catalog flagged the part as frequently chosen for the 2026 Lexus RX350. 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 |
Heavy Duty
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| PRESTONE | AFC12100 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Command Nitrite Free Extended Life CoolantYellow Nitrite Free OAT | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| AISIN Popular | ACT002 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | PinkHOAT | 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 RX350, from VALVOLINE, PRESTONE, AISIN and 1 other brand. 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 Heavy Duty section lists 1 option from PRESTONE — rated for severe service. PRESTONE AFC12100 is listed in this group.
The Standard Replacement section lists 3 options from AISIN, PENTOSIN and VALVOLINE — built to original-equipment specification. AISIN ACT002 is listed in this group.
Listed part numbers: AISIN ACT002, VALVOLINE 719009 and PRESTONE AFC12100, plus the other parts above.
Temperature Sender / Sensor
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| NISSENS | 207098 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Base Model or F Sport Design or F Sport Handling or Luxury or Premium or Premium+Location-Thermostat Housing | View on Amazon |
| NISSENS | 207139 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Base Model or F Sport Design or F Sport Handling or Luxury or Premium or Premium+Location-Control Valve | View on Amazon |
| STANDARD MOTOR PRODUCTS | TX319 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Located On Control Valve | View on Amazon |
| STANDARD MOTOR PRODUCTS | TX358 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Fits Located on Engin | 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.
4 Temperature Sender / Sensor parts are listed for the 2026 Lexus RX350, from NISSENS and STANDARD MOTOR PRODUCTS.
Part numbers include NISSENS 207098, NISSENS 207139 and STANDARD MOTOR PRODUCTS TX319, among others listed above.
Water Pump
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| FVP | US8237 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Base Model or F Sport Design or F Sport Handling or Luxury or Premium or Premium+ | View on Amazon |
| GMB | 1704240 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | View on Amazon | |
| NISSENS | 831385 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Base Model or F Sport Design or F Sport Handling or Luxury or Premium or Premium+Charge Air Cooling | View on Amazon |
| US MOTOR WORKS | US8237 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Base Model or F Sport Design or F Sport Handling or Luxury or Premium or Premium+ | 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.
4 Water Pump parts for the 2026 Lexus RX350 come from 4 brands — FVP, GMB, NISSENS and 1 other brand.
Listed part numbers: FVP US8237, GMB 1704240 and NISSENS 831385, plus the other parts above.
Buying Cooling System Parts for a 2026 Lexus RX350
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 2.4L L4 Turbocharged 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 Temperature Sender / Sensor .
Frequently Asked Questions
How many cooling system parts fit the 2026 Lexus RX350?
Our catalog currently lists 13 cooling system parts for the 2026 Lexus RX350 across 3 subcategories and 9 brands, covering the 2.4L L4 Turbocharged engine. Each part is matched to the engine(s) it fits.
What are the signs of cooling system problems on a 2026 Lexus RX350?
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 RX350 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 RX350?
Every part on this page is matched to the 2.4L L4 Turbocharged 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 RX350
Cooling System Parts for Other Lexus RX350 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.