This page lists 8 cooling system parts for the 2026 Lexus RX500H, across 3 part types, covering the 2.4L L4 ELECTRIC/GAS Turbocharged engine. Every part shows its brand, manufacturer part number and fitment notes.
On the 2026 Lexus RX500H, 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 8 listed parts are Coolant / Antifreeze (5 parts), Temperature Sender / Sensor (2 parts) and Water Pump (1 part).
Every part on this page is matched to the 2.4L L4 ELECTRIC/GAS Turbocharged — the only engine offered in the 2026 Lexus RX500H.
The most listed brands for 2026 Lexus RX500H cooling system parts are VALVOLINE (2 parts), NISSENS (2 parts) and PRESTONE (1 part), plus 3 more brands. Quality grades include Standard Replacement and Heavy Duty.
1 part on this 2026 Lexus RX500H page carries a "Popular" badge — the source catalog's flag for options frequently chosen for this vehicle — AISIN ACT002 (Coolant / Antifreeze). Click any part number to see every vehicle that part fits.
Coolant / Antifreeze
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 |
| VALVOLINE | 898406 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Hybrid Vehicle1 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 for the 2026 Lexus RX500H come from 4 brands — VALVOLINE, PRESTONE, AISIN and 1 other brand. The "Popular" part is AISIN ACT002.
In the Heavy Duty grade, PRESTONE supplies 1 part: rated for severe service. A representative part number is PRESTONE AFC12100.
In the Standard Replacement grade, VALVOLINE, AISIN and PENTOSIN supply 4 parts: built to original-equipment specification. A representative part number is AISIN ACT002.
This group includes AISIN ACT002, PRESTONE AFC12100 and PENTOSIN 8115209 and the remaining parts above.
Temperature Sender / Sensor
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| NISSENS | 207098 | 🇺🇸 US | Location-Thermostat Housing | View on Amazon |
| NISSENS | 207139 | 🇺🇸 US | Location-Control Valve | 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 for the 2026 Lexus RX500H come from NISSENS.
This group includes NISSENS 207098 and NISSENS 207139.
Water Pump
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| GMB | 1704220 | 🇺🇸 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.
One part is listed for the 2026 Lexus RX500H — GMB 1704220.
Buying Cooling System Parts for a 2026 Lexus RX500H
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 ELECTRIC/GAS 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 RX500H?
Our catalog currently lists 8 cooling system parts for the 2026 Lexus RX500H across 3 subcategories and 6 brands, covering the 2.4L L4 ELECTRIC/GAS Turbocharged engine. Each part is matched to the engine(s) it fits.
What are the signs of cooling system problems on a 2026 Lexus RX500H?
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 RX500H 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 RX500H?
Every part on this page is matched to the 2.4L L4 ELECTRIC/GAS 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 RX500H
Cooling System Parts for Other Lexus RX500H 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.