2023 Toyota Highlander 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

18 Coolant / Antifreeze parts are listed for the 2023 Toyota Highlander, from PRESTONE, PEAK, VALVOLINE and 3 other brands. PRESTONE AF2100 carries the "Popular" badge. 16 parts fit every engine; the other 2 are engine-specific.

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

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 8 options from AISIN, BECK/ARNLEY, VALVOLINE and 2 other brands — built to original-equipment specification. AISIN ACT002 is listed in this group.

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

4 Coolant Reservoir Cap parts for the 2023 Toyota Highlander come from 3 brands — MOTORAD, CALORSTAT and GATES. 3 parts fit every engine; the other 1 is engine-specific.

This group includes CALORSTAT RC0145, GATES 31541 and MOTORAD T118 and the remaining parts above.

This table covers the Inverter coolers. Typical signs include overheated fluid, a leak at the fittings, or mixed fluids in the reservoir. Flush the lines when you replace a cooler. Read more

5 Inverter Cooler parts for the 2023 Toyota Highlander come from 4 brands — GPD, DORMAN, CSF and 1 other brand.

The Economy section: 1 option from DORMAN. DORMAN 918466 is listed in this group.

Standard Replacement: 2 parts, from CSF and TECHPRO. A representative part number is CSF 3971.

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

This group includes DORMAN 918466, CSF 3971 and TECHPRO TO3011110 and the remaining parts above.

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

9 Radiator parts are listed for the 2023 Toyota Highlander, from CSF, GPD, DENSO and 4 other brands. CSF 3970 carries the "Popular" badge.

Economy: 1 part, from GPD. A representative part number is GPD 13842C.

The Standard Replacement section: 4 options from CSF, DENSO, SPECTRA PREMIUM and 1 other brand. CSF 3970 is listed in this group.

4 ungrouped parts are not assigned to a grade, with the same engine-level match.

This group includes CSF 3970, GPD 13842C and DENSO 2219626 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

9 Radiator Cap parts are listed for the 2023 Toyota Highlander, from MOTORAD, GATES, CALORSTAT and 1 other brand. GATES 31411 carries the "Popular" badge.

The Locking Replacement section lists 1 option from MOTORAD — grouped under the catalog's "Locking Replacement" designation — the notes column spells out what sets them apart. MOTORAD ST36 is listed in this group.

The Standard Replacement section: 4 options from GATES, CALORSTAT, MOTORAD and 1 other brand. GATES 31411 is listed in this group.

4 ungrouped parts are not assigned to a grade, with the same engine-level match.

Listed part numbers: GATES 31411, MOTORAD ST36 and CALORSTAT RC0047, plus the other parts above.

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

6 Radiator Fan Assembly parts for the 2023 Toyota Highlander come from 5 brands — UAC, GPD, FOUR SEASONS and 2 other brands. The "Popular" part is FOUR SEASONS 75337.

The Economy section: 1 option from GPD. GPD 2812263 is listed in this group.

Standard Replacement: 4 parts, from FOUR SEASONS, NISSENS, TYC and 1 other brand. A representative part number is FOUR SEASONS 75337.

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

This group includes FOUR SEASONS 75337, GPD 2812263 and NISSENS 850334 and the remaining parts above.

This table covers the upper, lower and connecting hoses between radiator, engine and reservoir. Typical signs include swelling, cracks, a soft spot, or a leak at a clamp. Replace adjacent aged hoses while the system is drained — they share the same heat cycle. Read more

This group shows a single part: CONTINENTAL 67231.

This table covers the Radiator Upper Air Baffle retainers and clips. Read more

2 Radiator Upper Air Baffle Retainer / Clip parts for the 2023 Toyota Highlander come from DORMAN. Every part fits both the 2.4L L4 Turbocharged and the 2.5L L4 ELECTRIC/GAS.

Part numbers include DORMAN 963134D and DORMAN 700675.

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

12 Temperature Sender / Sensor parts are listed for the 2023 Toyota Highlander, from STANDARD MOTOR PRODUCTS, WALKER PRODUCTS, WELLS and 6 other brands. ULTRA-POWER 5S1616 carries the "Popular" badge. 3 parts fit every engine; the other 9 are engine-specific.

Economy: 3 parts, from ULTRA-POWER, GPD and HOLSTEIN. A representative part number is ULTRA-POWER 5S1616.

The Standard Replacement section: 9 options from STANDARD MOTOR PRODUCTS, WALKER PRODUCTS, WELLS and 3 other brands. AISIN THSAZ8004 is listed in this group.

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

One part is listed for the 2023 Toyota Highlander — ELRING 306360.

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

6 Thermostat Housing / Water Outlet parts for the 2023 Toyota Highlander come from 2 brands — MOTORAD and GATES.

This group includes GATES CO35085, GATES CO35034 and MOTORAD CH2175 and the remaining parts 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

13 Water Pump parts for the 2023 Toyota Highlander come from 10 brands — AISIN, FOUR SEASONS, FVP and 7 other brands. The "Popular" part is AISIN WPT207.

The Economy section: 3 options from ACKOJA, BECK/ARNLEY and SKP. ACKOJA A70160016 is listed in this group.

Standard Replacement: 2 parts, from AISIN and FOUR SEASONS. A representative part number is AISIN WPT207.

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

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

3 Water Pump Gasket parts are listed for the 2023 Toyota Highlander, from ELRING, MAHLE / CLEVITE and VICTOR REINZ. 1 part fits every engine; the other 2 are engine-specific.

Listed part numbers: ELRING 917940, MAHLE / CLEVITE K33776 and VICTOR REINZ 711790100.