This page lists 37 cooling system parts for the 2023 Lexus IS350, across 7 part types, covering the 3.5L V6 engine. Every part shows its brand, manufacturer part number and fitment notes.
On the 2023 Lexus IS350, 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. 25 parts of the 37 listed are Coolant / Antifreeze (15 parts), Radiator Fan Assembly (5 parts) and Temperature Sender / Sensor (5 parts). The other 4 part types cover the remaining 12 parts.
Every part on this page is matched to the 3.5L V6 — the only engine offered in the 2023 Lexus IS350.
The most listed brands for 2023 Lexus IS350 cooling system parts are PRESTONE (5 parts), PEAK (4 parts) and BECK/ARNLEY (4 parts), plus 16 more brands. Quality grades include Standard Replacement, Economy and Premium.
5 parts on this 2023 Lexus IS350 page carry a "Popular" badge — the source catalog's flag for options frequently chosen for this vehicle — including PRESTONE AF2100 (Coolant / Antifreeze) and DORMAN 620498 (Radiator Fan Assembly). 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 🇨🇦 CA | Prime YellowAll Vehicles | View on Amazon |
Economy
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| PEAK | BQA1GAL | 🇺🇸 US 🇨🇦 CA | Blue Mountain Long LifeAll Vehicle | View on Amazon |
| PRESTONE | AF3100 | 🇺🇸 US 🇨🇦 CA | Prime Yellow - All VehiclesExtended Life | View on Amazon |
| VALVOLINE | 719009 | 🇺🇸 US 🇨🇦 CA | Multi-Vehicle Yellow1 Gallon | View on Amazon |
Premium
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| PRESTONE Popular | AF2100 | 🇺🇸 US 🇨🇦 CA | All Vehicles10yr/300k mi | View on Amazon |
| PEAK | PKP1GAL | 🇺🇸 US 🇨🇦 CA | All Vehicles Antifreeze1 Gallon | View on Amazon |
| PEAK | PXA1GAL | 🇺🇸 US 🇨🇦 CA | Global Lifetime1 Gallon | View on Amazon |
| PRESTONE | AF6210 | 🇺🇸 US 🇨🇦 CA | MAX Original EquipmentAsian Red/Pink | View on Amazon |
| PRESTONE | AFMAX | 🇺🇸 US 🇨🇦 CA | Max Universal1 Gallon | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| AISIN Popular | ACT002 | 🇺🇸 US 🇨🇦 CA | PinkHOAT | View on Amazon |
| VALVOLINE Popular | 675130 | 🇺🇸 US 🇨🇦 CA | Asian Vehicle Red1 Gallon | View on Amazon |
| BECK/ARNLEY | 2521502 | 🇺🇸 US 🇨🇦 CA | Premium Extra Life Pink | View on Amazon |
| BECK/ARNLEY | 2521002 | 🇺🇸 US 🇨🇦 CA | Premium Red | View on Amazon |
| PEAK | PAR1GAL | 🇺🇸 US 🇨🇦 CA | OET Asian Extended Life Red1 Gallon | View on Amazon |
| PENTOSIN | 8115209 | 🇺🇸 US 🇨🇦 CA | Pentofrost A41 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.
15 Coolant / Antifreeze parts for the 2023 Lexus IS350 come from 6 brands — PRESTONE, PEAK, VALVOLINE and 3 other brands. 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 3 options from PEAK, PRESTONE and VALVOLINE — the catalog's value-priced group. PEAK BQA1GAL is listed in this group.
In the Premium grade, PRESTONE and PEAK supply 5 parts: a step above OE specification in materials, tolerances or warranty terms. A representative part number is PRESTONE AF2100.
In the Standard Replacement grade, BECK/ARNLEY, AISIN, VALVOLINE and 2 other brands supply 6 parts: built to original-equipment specification. A representative part number is AISIN ACT002.
Coolant Reservoir Cap
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| CALORSTAT | RC0145 | 🇺🇸 US 🇨🇦 CA | Attachment Type: Threaded | View on Amazon |
| GATES | 31541 | 🇺🇸 US 🇨🇦 CA | OE TypeThreaded (Closed System) - (SAE Range 18-20 psi) | View on Amazon |
| MOTORAD | T51 | 🇺🇸 US 🇨🇦 CA | 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.
3 Coolant Reservoir Cap parts are listed for the 2023 Lexus IS350, from CALORSTAT, GATES and MOTORAD.
Part numbers include CALORSTAT RC0145, GATES 31541 and MOTORAD T51.
Cooling Fan Control Module
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| GATES | FCM111 | 🇺🇸 US 🇨🇦 CA | View on Amazon | |
| STANDARD MOTOR PRODUCTS | RY1890 | 🇺🇸 US 🇨🇦 CA | View on Amazon |
This table covers the Cooling Fan control modules.
2 Cooling Fan Control Module parts are listed for the 2023 Lexus IS350, from GATES and STANDARD MOTOR PRODUCTS.
Part numbers include GATES FCM111 and STANDARD MOTOR PRODUCTS RY1890.
Radiator
Economy
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| GPD | 13776C | 🇺🇸 US 🇨🇦 CA | View on Amazon | |
| TECHPRO | LX3010165 | 🇺🇸 US 🇨🇦 CA | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| TYC | 13776 | 🇺🇸 US 🇨🇦 CA | 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.
3 Radiator parts for the 2023 Lexus IS350 come from 3 brands — GPD, TECHPRO and TYC.
The Economy section: 2 options from GPD and TECHPRO. GPD 13776C is listed in this group.
Standard Replacement: 1 part, from TYC. A representative part number is TYC 13776.
Listed part numbers: GPD 13776C, TECHPRO LX3010165 and TYC 13776.
Radiator Fan Assembly
Economy
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| DORMAN Popular | 620498 | 🇺🇸 US 🇨🇦 CA | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| AGILITY | 6010036 | 🇺🇸 US 🇨🇦 CA | View on Amazon | |
| FOUR SEASONS | 76335 | 🇺🇸 US 🇨🇦 CA | View on Amazon | |
| TYC | 623230 | 🇺🇸 US 🇨🇦 CA | View on Amazon | |
| UAC | FA50658C | 🇺🇸 US 🇨🇦 CA | Radiator-Condenser Fan Assembly | View on Amazon |
This table covers the fan assemblies (and clutches, where listed) that pull air through the radiator.
5 Radiator Fan Assembly parts are listed for the 2023 Lexus IS350, from DORMAN, AGILITY, FOUR SEASONS and 2 other brands. DORMAN 620498 carries the "Popular" badge.
Economy: 1 part, from DORMAN. A representative part number is DORMAN 620498.
The Standard Replacement section: 4 options from AGILITY, FOUR SEASONS, TYC and 1 other brand. AGILITY 6010036 is listed in this group.
This group includes DORMAN 620498, AGILITY 6010036 and FOUR SEASONS 76335 and the remaining parts above.
Temperature Sender / Sensor
Economy
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| GPD | 1814519 | 🇺🇸 US 🇨🇦 CA | Connector Gender: Female | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| STANDARD MOTOR PRODUCTS Popular | TX273 | 🇺🇸 US 🇨🇦 CA | View on Amazon | |
| BECK/ARNLEY | 1581802 | 🇺🇸 US 🇨🇦 CA | View on Amazon | |
| WALKER PRODUCTS | 2112012 | 🇺🇸 US 🇨🇦 CA | Sensor Only | View on Amazon |
| WELLS | 5S15288 | 🇺🇸 US 🇨🇦 CA | 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.
5 Temperature Sender / Sensor parts for the 2023 Lexus IS350 come from 5 brands — GPD, STANDARD MOTOR PRODUCTS, BECK/ARNLEY and 2 other brands. The "Popular" part is STANDARD MOTOR PRODUCTS TX273.
The Economy section: 1 option from GPD. GPD 1814519 is listed in this group.
Standard Replacement: 4 parts, from STANDARD MOTOR PRODUCTS, BECK/ARNLEY, WALKER PRODUCTS and 1 other brand. A representative part number is STANDARD MOTOR PRODUCTS TX273.
Listed part numbers: STANDARD MOTOR PRODUCTS TX273, GPD 1814519 and BECK/ARNLEY 1581802, plus the other parts above.
Thermostat
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| AISIN | THT029 | 🇺🇸 US 🇨🇦 CA | View on Amazon | |
| BECK/ARNLEY | 1430976 | 🇺🇸 US 🇨🇦 CA | TEMPERATURE 86C/188F | View on Amazon |
| FOUR SEASONS | 86320 | 🇺🇸 US 🇨🇦 CA | Includes Housing | View on Amazon |
| MOTORAD | 1046188 | 🇺🇸 US 🇨🇦 CA | Includes Housing, Sensor, Seal | View on Amazon |
This table covers the thermostats that open the coolant circuit at the specified temperature. Typical signs include slow warm-up, a gauge that climbs in traffic, or heat that never quite arrives. Replace the housing gasket with the thermostat and bleed the system so a trapped air pocket does not cook the new part.
4 Thermostat parts are listed for the 2023 Lexus IS350, from AISIN, BECK/ARNLEY, FOUR SEASONS and 1 other brand.
Part numbers include AISIN THT029, BECK/ARNLEY 1430976 and FOUR SEASONS 86320, among others listed above.
Buying Cooling System Parts for a 2023 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 Radiator Fan Assembly .
Frequently Asked Questions
How many cooling system parts fit the 2023 Lexus IS350?
Our catalog currently lists 37 cooling system parts for the 2023 Lexus IS350 across 7 subcategories and 19 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 2023 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 2023 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 2023 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 2023 Lexus IS350
Cooling System Parts for Other Lexus IS350 Years
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