2023 Lexus ES300H Cooling System Parts

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. Read more

15 Coolant / Antifreeze parts are listed for the 2023 Lexus ES300H, from PRESTONE, PEAK, VALVOLINE and 3 other brands. PRESTONE AF2100 carries the "Popular" badge.

The Compatible With All Colors section lists 1 option from PRESTONE — grouped under the catalog's "Compatible With All Colors" designation — the notes column spells out what sets them apart. PRESTONE AF3055 is listed in this group.

In the Economy grade, PEAK and PRESTONE supply 2 parts: the catalog's value-priced group. A representative part number is PEAK BQA1GAL.

The Premium section lists 5 options from PRESTONE and PEAK — a step above OE specification in materials, tolerances or warranty terms. PRESTONE AF2100 is listed in this group.

The Standard Replacement section lists 7 options from VALVOLINE, BECK/ARNLEY, AISIN and 2 other brands — built to original-equipment specification. AISIN ACT002 is listed in this group.

This table covers the seals at the Coolant Hose Connector / Flange. Typical signs include a wet housing, a drip after sitting, or fluid flung off a rotating shaft. Fix the surface the seal rides on. A new seal on a grooved shaft will leak again. Read more

This group shows a single part: ELRING 106660.

This table covers the overflow / expansion tanks that hold extra coolant. Read more

This group shows a single part: TECHPRO TO3014138.

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. Read more

4 Coolant Reservoir Cap parts for the 2023 Lexus ES300H come from 3 brands — MOTORAD, CALORSTAT and GATES.

Part numbers include CALORSTAT RC0145, GATES 31541 and MOTORAD T51, among others listed above.

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. Read more

7 Radiator parts are listed for the 2023 Lexus ES300H, from GPD, TECHPRO, CSF and 4 other brands. CSF 3902 carries the "Popular" badge.

Economy: 2 parts, from GPD and TECHPRO. A representative part number is GPD 13695C.

The Standard Replacement section: 4 options from CSF, TYC, DENSO and 1 other brand. CSF 3902 is listed in this group.

1 ungrouped part is not assigned to a grade, with the same engine-level match.

Listed part numbers: CSF 3902, GPD 13695C and TECHPRO TO3010368, plus the other parts above.

This table covers the caps that hold system pressure at the radiator or reservoir neck. 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. Read more

4 Radiator Cap parts are listed for the 2023 Lexus ES300H, from CALORSTAT, GATES, MOTORAD and 1 other brand.

Listed part numbers: CALORSTAT RC0047, GATES 31411 and MOTORAD T36, plus the other parts above.

This table covers the fan assemblies (and clutches, where listed) that pull air through the radiator. Read more

5 Radiator Fan Assembly parts for the 2023 Lexus ES300H come from 5 brands — TECHPRO, FOUR SEASONS, NISSENS and 2 other brands. The "Popular" part is FOUR SEASONS 75336.

The Economy section: 1 option from TECHPRO. TECHPRO TO3115209 is listed in this group.

Standard Replacement: 4 parts, from FOUR SEASONS, NISSENS, TYC and 1 other brand. A representative part number is FOUR SEASONS 75336.

Part numbers include FOUR SEASONS 75336, TECHPRO TO3115209 and NISSENS 850333, among others listed above.

This table covers the Radiator insulators. Read more

This group shows a single part: TECHPRO TO3013100.

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. Read more

5 Temperature Sender / Sensor parts are listed for the 2023 Lexus ES300H, from GPD, STANDARD MOTOR PRODUCTS, WALKER PRODUCTS and 2 other brands. STANDARD MOTOR PRODUCTS TX319 carries the "Popular" badge.

Economy: 1 part, from GPD. A representative part number is GPD 1814549.

The Standard Replacement section: 3 options from STANDARD MOTOR PRODUCTS, WALKER PRODUCTS and WELLS. STANDARD MOTOR PRODUCTS TX319 is listed in this group.

1 ungrouped part is not assigned to a grade, with the same engine-level match.

This group includes STANDARD MOTOR PRODUCTS TX319, GPD 1814549 and WALKER PRODUCTS 2112017 and the remaining parts above.

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. Read more

This group shows a single part: MOTORAD 1231180.

This table covers the seals at the thermostat housing and water outlet. Typical signs include a wet housing, a drip after sitting, or fluid flung off a rotating shaft. Fix the surface the seal rides on. A new seal on a grooved shaft will leak again. Read more

2 Thermostat / Thermostat Housing / Water Outlet Seal parts are listed for the 2023 Lexus ES300H, from ELRING and MAHLE / CLEVITE.

Part numbers include ELRING 306360 and MAHLE / CLEVITE C33798.

This table covers the housings and outlets the thermostat sits in. Read more

2 Thermostat Housing / Water Outlet parts for the 2023 Lexus ES300H come from MOTORAD.

Listed part numbers: MOTORAD CH2094 and MOTORAD CH1051.

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. Read more

5 Water Pump parts for the 2023 Lexus ES300H come from 4 brands — AISIN, BECK/ARNLEY, FOUR SEASONS and 1 other brand. The "Popular" part is AISIN WPT207.

The Economy section: 1 option from BECK/ARNLEY. BECK/ARNLEY 1312557 is listed in this group.

Standard Replacement: 4 parts, from AISIN, FOUR SEASONS and GATES. A representative part number is AISIN WPT207.

Listed part numbers: AISIN WPT207, BECK/ARNLEY 1312557 and AISIN WQT006, plus the other parts above.

This table covers the gaskets between the water pump and the block or housing. Typical signs include seepage at the joint, a burnt-oil smell, or a leak that appears only after a long drive. Clean both flanges and torque in the sequence the notes or the manual call for. Read more

3 Water Pump Gasket parts are listed for the 2023 Lexus ES300H, from ELRING, MAHLE / CLEVITE and VICTOR REINZ.

This group includes ELRING 917940, MAHLE / CLEVITE K33776 and VICTOR REINZ 711790100.