2021 Toyota Highlander Cooling System Parts

This table covers the Battery 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

This group shows a single part: MOTORAD TA9247.

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

19 Coolant / Antifreeze parts are listed for the 2021 Toyota Highlander, from PRESTONE, PEAK, VALVOLINE and 4 other brands. FVP MV5050GAL carries the "Popular" badge. 17 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, FVP, PEAK, PRESTONE and 1 other brand supply 4 parts: the catalog's value-priced group. A representative part number is FVP MV5050GAL.

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

This table covers the Coolant filler necks. Read more

This group shows a single part: FOUR SEASONS 86372.

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 2021 Toyota Highlander come from 2 brands — MOTORAD and CALORSTAT. 1 part fits every engine; the other 2 are engine-specific.

Part numbers include CALORSTAT RC0145, MOTORAD T51 and MOTORAD T118.

This table covers the adapters used to pressure-test this cooling system. Read more

MOTORAD supplies both parts for the 2021 Toyota Highlander. All of them fit every engine offered in the 2021 Highlander.

This group includes MOTORAD 3124 and MOTORAD 3125.

This table covers the intercoolers that cool turbo or supercharger charge air. Read more

One part is listed for the 2021 Toyota Highlander — FVP RAD13907.

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 2021 Toyota Highlander come from 4 brands — TECHPRO, DORMAN, CSF and 1 other brand. The "Popular" part is CSF 3971.

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

Standard Replacement: 3 parts, from TECHPRO and CSF. A representative part number is CSF 3971.

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

This group includes CSF 3971, DORMAN 918466 and TECHPRO TO3011109 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

7 Radiator parts are listed for the 2021 Toyota Highlander, from CSF, TYC, AGILITY and 4 other brands. CSF 3970 carries the "Popular" badge. 6 parts fit every engine; the other 1 is engine-specific.

This group includes CSF 3970, TYC 13842 and AGILITY 8013842 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 2021 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

5 Radiator Fan Assembly parts for the 2021 Toyota Highlander come from 5 brands — GPD, TECHPRO, VARIOUS MFR and 2 other brands. The "Popular" part is TYC 624980. 4 parts fit every engine; the other 1 is engine-specific.

The Economy section: 3 options from GPD, TECHPRO and VARIOUS MFR. GPD 2812263 is listed in this group.

Standard Replacement: 2 parts, from TYC and UAC. A representative part number is TYC 624980.

Listed part numbers: TYC 624980, GPD 2812263 and TECHPRO TO3115214, plus the other 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

3 Radiator Hose parts for the 2021 Toyota Highlander come from CONTINENTAL.

This group includes CONTINENTAL 66231, CONTINENTAL 67231 and CONTINENTAL 62269.

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

2 Radiator Upper Air Baffle Retainer / Clip parts for the 2021 Toyota Highlander come from DORMAN. Every part fits both the 2.5L L4 ELECTRIC/GAS and the 3.5L V6.

This group includes 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

13 Temperature Sender / Sensor parts are listed for the 2021 Toyota Highlander, from GPD, AISIN, STANDARD MOTOR PRODUCTS and 4 other brands. AISIN THSAZ8004 carries the "Popular" badge.

Economy: 2 parts, from GPD. A representative part number is GPD 1814549.

The Standard Replacement section: 11 options from AISIN, STANDARD MOTOR PRODUCTS, BECK/ARNLEY 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

14 Thermostat parts for the 2021 Toyota Highlander come from 7 brands — MOTORAD, AISIN, BECK/ARNLEY and 4 other brands. The "Popular" part is AISIN THT023.

The Economy section: 2 options from AUTOTECNICA and DORMAN. AUTOTECNICA TY0719461 is listed in this group.

Standard Replacement: 12 parts, from MOTORAD, AISIN, BECK/ARNLEY and 2 other brands. A representative part number is AISIN THT023.

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

MAHLE / CLEVITE supplies both parts for the 2021 Toyota Highlander.

Part numbers include MAHLE / CLEVITE C33835 and MAHLE / CLEVITE C33837.

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

7 Thermostat Housing / Water Outlet parts for the 2021 Toyota Highlander come from 3 brands — GATES, MOTORAD and SKP. The "Popular" part is SKP SK86328.

The Economy section: 1 option from SKP. SKP SK86328 is listed in this group.

Standard Replacement: 4 parts, from GATES and MOTORAD. A representative part number is GATES CO35085.

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

Listed part numbers: SKP SK86328, GATES CO35085 and GATES CO35034, plus the other parts above.

This table covers the gaskets that seal the Water Inlet. 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

One part is listed for the 2021 Toyota Highlander — AJUSA 01184900.

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

14 Water Pump parts for the 2021 Toyota Highlander come from 9 brands — BECK/ARNLEY, FVP, SKP and 6 other brands. The "Popular" part is AISIN WPT207.

The Economy section: 8 options from BECK/ARNLEY, SKP, ACKOJA and 2 other brands. ACKOJA A70160016 is listed in this group.

Standard Replacement: 6 parts, from AISIN, GATES, DAYCO and 2 other brands. A representative part number is AISIN WPT207.

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

2 Water Pump Gasket parts are listed for the 2021 Toyota Highlander, from MAHLE / CLEVITE and VICTOR REINZ.

Part numbers include MAHLE / CLEVITE K33776 and VICTOR REINZ 711790100.