16 Cooling system parts are listed for the 2025 Lexus RZ300E, in 4 part types, covering the ELECTRIC engine. Each one has a brand, a manufacturer part number and notes that say where it fits.
On the 2025 Lexus RZ300E, 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. 15 parts of the 16 listed are Coolant / Antifreeze (10 parts), Temperature Sender / Sensor (3 parts) and Coolant Reservoir Cap (2 parts). The other 1 part type covers the remaining 1 part.
Every part on this page is matched to the ELECTRIC — the only engine offered in the 2025 Lexus RZ300E.
The most listed brands for 2025 Lexus RZ300E cooling system parts are PRESTONE (6 parts), VALVOLINE (3 parts) and PENTOSIN (1 part), plus 6 more brands. Quality grades include Standard Replacement, Premium and Economy.
2 parts on this 2025 Lexus RZ300E page carry a "Popular" badge — the source catalog's flag for options frequently chosen for this vehicle — including VALVOLINE ZXG051 (Coolant / Antifreeze) and PRESTONE AF2100 (Coolant / Antifreeze). Click any part number to see every vehicle that part fits.
Coolant / Antifreeze
Compatible With All Colors
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| PRESTONE | AF3055 | 🇺🇸 US | Prime YellowAll Vehicles | View on Amazon |
Economy
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| PRESTONE | AF3100 | 🇺🇸 US | Prime Yellow - All VehiclesExtended Life | View on Amazon |
Heavy Duty
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| VALVOLINE Popular | ZXG051 | 🇺🇸 US | G05 Yellow1 Gallon | View on Amazon |
| PRESTONE | AFC12100 | 🇺🇸 US | Command Nitrite Free Extended Life CoolantYellow Nitrite Free OAT | View on Amazon |
Premium
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| PRESTONE Popular | AF2100 | 🇺🇸 US | All Vehicles10yr/300k mi | View on Amazon |
| PRESTONE | AF6210 | 🇺🇸 US | MAX Original EquipmentAsian Red/Pink | View on Amazon |
| PRESTONE | AFMAX | 🇺🇸 US | Max Universal1 Gallon | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| PENTOSIN | 8115209 | 🇺🇸 US | Pentofrost A41 Gallon | View on Amazon |
| VALVOLINE | 904683 | 🇺🇸 US | HT-12 Pink1 Gallon | View on Amazon |
| VALVOLINE | 904685 | 🇺🇸 US | HT-12 Green1 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.
10 Coolant / Antifreeze parts for the 2025 Lexus RZ300E come from 3 brands — PRESTONE, VALVOLINE and PENTOSIN. The "Popular" part is VALVOLINE ZXG051.
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 1 option from PRESTONE — the catalog's value-priced group. PRESTONE AF3100 is listed in this group.
In the Heavy Duty grade, VALVOLINE and PRESTONE supply 2 parts: rated for severe service. A representative part number is VALVOLINE ZXG051.
In the Premium grade, PRESTONE supplies 3 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 and PENTOSIN supply 3 parts: built to original-equipment specification. A representative part number is PENTOSIN 8115209.
Coolant Reservoir Cap
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| CALORSTAT | RC0145 | 🇺🇸 US | Attachment Type: Threaded | View on Amazon |
| MOTORAD | T51 | 🇺🇸 US | Standard | 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.
2 Coolant Reservoir Cap parts are listed for the 2025 Lexus RZ300E, from CALORSTAT and MOTORAD.
This group includes CALORSTAT RC0145 and MOTORAD T51.
Radiator Fan Assembly
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| UAC | FA51395C | 🇺🇸 US | View on Amazon |
This table covers the fan assemblies (and clutches, where listed) that pull air through the radiator.
One part is listed for the 2025 Lexus RZ300E — UAC FA51395C.
Temperature Sender / Sensor
Economy
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| GPD | 1814549 | 🇺🇸 US | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| WELLS | 5S17570 | 🇺🇸 US | Drive Motor Battery Pack | View on Amazon |
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| NISSENS | 207139 | 🇺🇸 US | 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.
3 Temperature Sender / Sensor parts for the 2025 Lexus RZ300E come from 3 brands — GPD, WELLS and NISSENS.
The Economy section: 1 option from GPD. GPD 1814549 is listed in this group.
Standard Replacement: 1 part, from WELLS. A representative part number is WELLS 5S17570.
1 further part sits outside the graded sections, with the same engine-level match.
Listed part numbers: GPD 1814549, WELLS 5S17570 and NISSENS 207139.
Buying Cooling System Parts for a 2025 Lexus RZ300E
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 ELECTRIC 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 2025 Lexus RZ300E?
Our catalog currently lists 16 cooling system parts for the 2025 Lexus RZ300E across 4 subcategories and 9 brands, covering the ELECTRIC engine. Each part is matched to the engine(s) it fits.
What are the signs of cooling system problems on a 2025 Lexus RZ300E?
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 2025 Lexus RZ300E 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 2025 Lexus RZ300E?
Every part on this page is matched to the ELECTRIC 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 2025 Lexus RZ300E
Cooling System Parts for Other Lexus RZ300E Years
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