2023 Lexus IS300 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 IS300, 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, PRESTONE and VALVOLINE supply 3 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 6 options from BECK/ARNLEY, AISIN, VALVOLINE and 2 other brands — 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

3 Coolant Reservoir Cap parts for the 2023 Lexus IS300 come from 3 brands — CALORSTAT, GATES and MOTORAD.

This group includes CALORSTAT RC0145, GATES 31541 and MOTORAD T51.

This table covers the Cooling Fan control modules. Read more

2 Cooling Fan Control Module parts for the 2023 Lexus IS300 come from 2 brands — GATES and SKP.

Listed part numbers: GATES FCM143 and SKP SKFCM143.

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

6 Radiator parts are listed for the 2023 Lexus IS300, from GPD, DENSO, TYC and 2 other brands. DENSO 2219578 carries the "Popular" badge.

Economy: 2 parts, from GPD. A representative part number is GPD 13912C.

The Standard Replacement section: 4 options from DENSO, TYC, OSC and 1 other brand. DENSO 2219578 is listed in this group.

This group includes DENSO 2219578, GPD 13912C and GPD 13612C and the remaining parts above.

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

This group shows a single part: TECHPRO LX3115149.

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

7 Temperature Sender / Sensor parts are listed for the 2023 Lexus IS300, from HOLSTEIN, ULTRA-POWER, DENSO and 4 other brands. DENSO 1931000 carries the "Popular" badge.

Economy: 2 parts, from HOLSTEIN and ULTRA-POWER. A representative part number is HOLSTEIN 2CTS0051.

The Standard Replacement section: 5 options from DENSO, STANDARD MOTOR PRODUCTS, ACDELCO and 2 other brands. DENSO 1931000 is listed in this group.

Part numbers include DENSO 1931000, HOLSTEIN 2CTS0051 and ULTRA-POWER 5S1616, among others listed 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 for the 2023 Lexus IS300 come from 3 brands — MOTORAD, AISIN and BECK/ARNLEY.

Part numbers include AISIN THT029, BECK/ARNLEY 1430971 and MOTORAD 1064172, among others listed above.

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

This group shows a single part: MOTORAD CH3174.

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

7 Water Pump parts for the 2023 Lexus IS300 come from 7 brands — US MOTOR WORKS, AISIN, GMB and 4 other brands. The "Popular" part is AISIN WPT203.

The Economy section: 1 option from US MOTOR WORKS. US MOTOR WORKS US8174 is listed in this group.

Standard Replacement: 6 parts, from AISIN, GMB, DAYCO and 3 other brands. A representative part number is AISIN WPT203.

Listed part numbers: AISIN WPT203, US MOTOR WORKS US8174 and GMB 1703030, plus the other parts above.