2018 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

19 Coolant / Antifreeze parts are listed for the 2018 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 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 2018 Toyota Highlander come from 3 brands — MOTORAD, AUTOTECNICA and CALORSTAT. 1 part fits every engine; the other 3 are engine-specific.

This group includes AUTOTECNICA TY1414614, CALORSTAT RC0145 and MOTORAD T162 and the remaining parts above.

This table covers the Cooling Fan control modules. Read more

9 Cooling Fan Control Module parts for the 2018 Toyota Highlander come from 6 brands — GATES, STANDARD MOTOR PRODUCTS, ACKOJA and 3 other brands. The "Popular" part is GATES FCM143. 1 part fits every engine; the other 8 are engine-specific.

Listed part numbers: GATES FCM143, STANDARD MOTOR PRODUCTS RY1819 and ACKOJA A70790003, plus the other parts above.

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

3 Cooling System Tester Adapter parts are listed for the 2018 Toyota Highlander, from MOTORAD and GATES. 2 parts fit every engine; the other 1 is engine-specific.

Part numbers include GATES 31409, 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 2018 Toyota Highlander — OSC 13625.

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

3 Inverter Cooler parts for the 2018 Toyota Highlander come from 3 brands — AGILITY, DENSO and GPD.

Listed part numbers: AGILITY 8013625, DENSO 2219596 and GPD 2611437.

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

16 Radiator parts are listed for the 2018 Toyota Highlander, from GPD, CSF, DENSO and 7 other brands. CSF 3773 carries the "Popular" badge.

Economy: 2 parts, from GPD. A representative part number is GPD 13449C.

The Standard Replacement section: 14 options from CSF, DENSO, NISSENS and 6 other brands. CSF 3773 is listed in this group.

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

7 Radiator Cap parts are listed for the 2018 Toyota Highlander, from MOTORAD, GATES, ACDELCO and 2 other brands. GATES 31412 carries the "Popular" badge. 4 parts fit every engine; the other 3 are engine-specific.

The Locking Replacement section lists 2 options from ACDELCO and MOTORAD — grouped under the catalog's "Locking Replacement" designation — the notes column spells out what sets them apart. ACDELCO 12R07 is listed in this group.

The Standard Replacement section: 4 options from GATES, MOTORAD, CALORSTAT and 1 other brand. GATES 31412 is listed in this group.

1 ungrouped part is not assigned to a grade, with the same engine-level match.

Part numbers include GATES 31412, ACDELCO 12R07 and MOTORAD ST37, among others listed above.

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

17 Radiator Fan Assembly parts for the 2018 Toyota Highlander come from 11 brands — DORMAN, GPD, TECHPRO and 8 other brands. The "Popular" part is DORMAN 621540. 1 part fits every engine; the other 16 are engine-specific.

The Economy section: 8 options from DORMAN, GPD, TECHPRO and 2 other brands. DORMAN 621540 is listed in this group.

Standard Replacement: 9 parts, from AGILITY, FOUR SEASONS, TYC and 3 other brands. A representative part number is AGILITY 6010331.

This table covers the Radiator Fan motors. Typical signs include no motion, a squeal, or a motor that only runs on one speed. Confirm power, ground and the control module before replacing the motor. Read more

One part is listed for the 2018 Toyota Highlander — ACKOJA A70010041.

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

10 Radiator Hose parts for the 2018 Toyota Highlander come from 4 brands — CONTINENTAL, GATES, ACDELCO and 1 other brand. The "Popular" part is CONTINENTAL 66196. 1 part fits every engine; the other 9 are engine-specific.

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

19 Temperature Sender / Sensor parts are listed for the 2018 Toyota Highlander, from STANDARD MOTOR PRODUCTS, DELPHI, BECK/ARNLEY and 11 other brands. ULTRA-POWER 5S1616 carries the "Popular" badge. 4 parts fit every engine; the other 15 are engine-specific.

Economy: 4 parts, from ULTRA-POWER, GPD, HOLSTEIN and 1 other brand. A representative part number is ULTRA-POWER 5S1616.

The Standard Replacement section: 15 options from STANDARD MOTOR PRODUCTS, DELPHI, BECK/ARNLEY and 7 other brands. DELPHI TS10289 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

28 Thermostat parts for the 2018 Toyota Highlander come from 10 brands — MOTORAD, CALORSTAT, FACET and 7 other brands. The "Popular" part is MOTORAD 7281180. They are grouped as Economy, Heavy Duty, Premium and Standard Replacement, with Standard Replacement the largest group at 22 parts from MOTORAD, CALORSTAT, FACET and 6 other brands.

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

10 Thermostat / Thermostat Housing / Water Outlet Seal parts are listed for the 2018 Toyota Highlander, from MAHLE / CLEVITE, FEL-PRO, MOTORAD and 4 other brands. FEL-PRO 35445 carries the "Popular" badge.

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

6 Thermostat Housing / Water Outlet parts for the 2018 Toyota Highlander come from 5 brands — GATES, SKP, MOTORAD and 2 other brands. The "Popular" part is MOTORAD CH2904.

The Economy section: 1 option from SKP. SKP SK9025904 is listed in this group.

Standard Replacement: 4 parts, from MOTORAD, ACKOJA, FOUR SEASONS and 1 other brand. A representative part number is MOTORAD CH2904.

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

Listed part numbers: MOTORAD CH2904, SKP SK9025904 and ACKOJA A70990015, 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 2018 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

22 Water Pump parts for the 2018 Toyota Highlander come from 12 brands — FVP, AISIN, SKP and 9 other brands. The "Popular" part is SKP SK1704010.

The Economy section: 9 options from SKP, US MOTOR WORKS, BECK/ARNLEY and 2 other brands. SKP SK1704010 is listed in this group.

Standard Replacement: 13 parts, from AISIN, GATES, DAYCO and 5 other brands. A representative part number is ACDELCO 252958.

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

7 Water Pump Gasket parts are listed for the 2018 Toyota Highlander, from FEL-PRO, APEX, MAHLE / CLEVITE and 1 other brand. FEL-PRO 36013 carries the "Popular" badge.

Listed part numbers: FEL-PRO 36013, FEL-PRO 36011 and APEX AWP3276, plus the other parts above.