2025 Lexus LX600 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

10 Coolant / Antifreeze parts for the 2025 Lexus LX600 come from 4 brands — PRESTONE, VALVOLINE, AISIN and 1 other brand. 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 2 options from PRESTONE and VALVOLINE — the catalog's value-priced group. PRESTONE AF3100 is listed in this group.

In the Heavy Duty grade, PRESTONE supplies 1 part: rated for severe service. A representative part number is PRESTONE AFC12100.

In the Premium grade, PRESTONE supplies 3 parts: a step above OE specification in materials, tolerances or warranty terms. A representative part number is PRESTONE AF2100.

In the Standard Replacement grade, AISIN, PENTOSIN and VALVOLINE supply 3 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 2025 Lexus LX600, from CALORSTAT and MOTORAD.

Part numbers include CALORSTAT RC0145 and MOTORAD T51.

This table covers the Radiator Fan clutches. Typical signs include slip at highway speed, chatter on takeoff, or a pedal that stays low. Resurface or replace the flywheel with the clutch — a heat-checked flywheel wastes the new disc. Read more

3 Radiator Fan Clutch parts for the 2025 Lexus LX600 come from 3 brands — FOUR SEASONS, HAYDEN and US MOTOR WORKS.

Listed part numbers: FOUR SEASONS 46159, HAYDEN 3350 and US MOTOR WORKS 22365.

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

4 Temperature Sender / Sensor parts for the 2025 Lexus LX600 come from 4 brands — GPD, BECK/ARNLEY, STANDARD MOTOR PRODUCTS and 1 other brand.

The Economy section: 1 option from GPD. GPD 1814549 is listed in this group.

Standard Replacement: 2 parts, from BECK/ARNLEY and STANDARD MOTOR PRODUCTS. A representative part number is BECK/ARNLEY 1581797.

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

Part numbers include GPD 1814549, BECK/ARNLEY 1581797 and STANDARD MOTOR PRODUCTS TX319, 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

3 Thermostat parts are listed for the 2025 Lexus LX600, from AISIN, JAPANESE OE and MOTORAD.

Listed part numbers: AISIN THT027, JAPANESE OE WHTYJ82 and MOTORAD 1450180.

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

4 Water Pump parts are listed for the 2025 Lexus LX600, from FVP, GMB and US MOTOR WORKS.

Listed part numbers: FVP 1704230 and FVP US8239, plus the other parts above.