2025 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

9 Coolant / Antifreeze parts are listed for the 2025 Lexus ES300H, from PRESTONE, VALVOLINE, AISIN and 1 other brand. 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, PRESTONE supplies 1 part: the catalog's value-priced group. A representative part number is PRESTONE AF3100.

The Premium section lists 3 options from PRESTONE — a step above OE specification in materials, tolerances or warranty terms. PRESTONE AF2100 is listed in this group.

The Standard Replacement section lists 4 options from VALVOLINE, AISIN and PENTOSIN — built to original-equipment specification. AISIN ACT002 is listed in this group.

Listed part numbers: PRESTONE AF2100, PRESTONE AF3055 and PRESTONE AF3100, plus the other parts above.

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 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

3 Coolant Reservoir Cap parts for the 2025 Lexus ES300H come from 3 brands — CALORSTAT, GATES and MOTORAD.

Listed part numbers: CALORSTAT RC0145, GATES 31541 and MOTORAD T51.

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

4 Radiator parts are listed for the 2025 Lexus ES300H, from GPD, CSF, DENSO and 1 other brand.

Economy: 1 part, from GPD. A representative part number is GPD 13695C.

The Standard Replacement section: 3 options from CSF, DENSO and TYC. CSF 3902 is listed in this group.

This group includes GPD 13695C, CSF 3902 and DENSO 2219654 and the remaining 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 2025 Lexus ES300H, from CALORSTAT, GATES, MOTORAD and 1 other brand.

Part numbers include CALORSTAT RC0047, GATES 31411 and MOTORAD T36, among others listed above.

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

3 Temperature Sender / Sensor parts are listed for the 2025 Lexus ES300H, from NISSENS, STANDARD MOTOR PRODUCTS and WELLS.

This group includes NISSENS 207139, STANDARD MOTOR PRODUCTS TX319 and WELLS 5S17570.

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 2025 Lexus ES300H, from ELRING and MAHLE / CLEVITE.

Listed part numbers: ELRING 306360 and MAHLE / CLEVITE C33798.

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

This group shows a single part: 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

8 Water Pump parts for the 2025 Lexus ES300H come from 6 brands — FVP, BECK/ARNLEY, AISIN and 3 other brands. The "Popular" part is BECK/ARNLEY 1312557.

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

Standard Replacement: 3 parts, from AISIN, FOUR SEASONS and GMB. A representative part number is AISIN WPT207.

4 further parts sit outside the graded sections, with the same engine-level match.

Part numbers include BECK/ARNLEY 1312557, AISIN WPT207 and FOUR SEASONS 89072, among others listed 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

2 Water Pump Gasket parts are listed for the 2025 Lexus ES300H, from ELRING and MAHLE / CLEVITE.

This group includes ELRING 917940 and MAHLE / CLEVITE K33776.