2025 Lexus TX550H+ 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

11 Coolant / Antifreeze parts are listed for the 2025 Lexus TX550H+, from PRESTONE, VALVOLINE, AISIN and 2 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, PRESTONE supplies 1 part: the catalog's value-priced group. A representative part number is PRESTONE AF3100.

The Heavy Duty section lists 1 option from PRESTONE — rated for severe service. PRESTONE AFC12100 is listed in this group.

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 5 options from VALVOLINE, AISIN, BECK/ARNLEY and 1 other brand — built to original-equipment specification. AISIN ACT002 is listed in this group.

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

2 Coolant Reservoir Cap parts for the 2025 Lexus TX550H+ come from 2 brands — CALORSTAT and MOTORAD.

Listed part numbers: CALORSTAT RC0145 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 TX550H+, from GPD, CSF, KOYORAD and 1 other brand.

Economy: 1 part, from GPD. A representative part number is GPD 14007C.

The Standard Replacement section: 2 options from CSF and KOYORAD. CSF 4016 is listed in this group.

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

Listed part numbers: GPD 14007C, CSF 4016 and KOYORAD A14007, 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

2 Radiator Cap parts are listed for the 2025 Lexus TX550H+, from CALORSTAT and MOTORAD.

Part numbers include CALORSTAT RC0047 and MOTORAD T36.

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 TX550H+, from GPD, WELLS and NISSENS.

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

The Standard Replacement section: 1 option from WELLS. WELLS 5S15288 is listed in this group.

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

This group includes GPD 1814549, WELLS 5S15288 and NISSENS 207157.

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

4 Thermostat parts for the 2025 Lexus TX550H+ come from 4 brands — DORMAN, AISIN, FOUR SEASONS and 1 other brand.

The Economy section: 1 option from DORMAN. DORMAN 9025212 is listed in this group.

Standard Replacement: 3 parts, from AISIN, FOUR SEASONS and MOTORAD. A representative part number is AISIN THT021.

Part numbers include DORMAN 9025212, AISIN THT021 and FOUR SEASONS 86321, among others listed above.

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

6 Water Pump parts for the 2025 Lexus TX550H+ come from 6 brands — US MOTOR WORKS, BECK/ARNLEY, FVP and 3 other brands. The "Popular" part is US MOTOR WORKS US8150.

The Economy section: 3 options from US MOTOR WORKS, BECK/ARNLEY and FVP. US MOTOR WORKS US8150 is listed in this group.

Standard Replacement: 3 parts, from AISIN, DAYCO and GMB. A representative part number is AISIN WPT808.

Listed part numbers: US MOTOR WORKS US8150 and BECK/ARNLEY 1312538, plus the other parts above.