2023 Lexus RC300 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 for the 2023 Lexus RC300 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.

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 are listed for the 2023 Lexus RC300, from CALORSTAT and MOTORAD.

Part numbers include 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

2 Radiator parts for the 2023 Lexus RC300 come from 2 brands — GPD and UAC.

The Economy section: 1 option from GPD. GPD 13570C is listed in this group.

Standard Replacement: 1 part, from UAC. A representative part number is UAC RA13701C.

Listed part numbers: GPD 13570C and UAC RA13701C.

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

3 Radiator Fan Assembly parts are listed for the 2023 Lexus RC300, from AGILITY, FOUR SEASONS and UAC.

Listed part numbers: AGILITY 6010351, FOUR SEASONS 76335 and UAC FA50658C.

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 for the 2023 Lexus RC300 come from 5 brands — GPD, WALKER PRODUCTS, BECK/ARNLEY and 2 other brands. The "Popular" part is WALKER PRODUCTS 2112012.

The Economy section: 1 option from GPD. GPD 1814519 is listed in this group.

Standard Replacement: 3 parts, from WALKER PRODUCTS, BECK/ARNLEY and WELLS. A representative part number is WALKER PRODUCTS 2112012.

1 further part sits outside the graded sections, with the same engine-level match.

Listed part numbers: WALKER PRODUCTS 2112012, GPD 1814519 and BECK/ARNLEY 1581802, plus the other 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

4 Thermostat parts are listed for the 2023 Lexus RC300, 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.

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

10 Water Pump parts are listed for the 2023 Lexus RC300, from BECK/ARNLEY, FVP, SKP and 7 other brands. AISIN WPT808 carries the "Popular" badge.

Economy: 4 parts, from BECK/ARNLEY, FVP, SKP and 1 other brand. A representative part number is BECK/ARNLEY 1312538.

The Standard Replacement section: 6 options from AISIN, GATES, DAYCO and 3 other brands. AISIN WPT808 is listed in this group.