2021 Toyota Sienna 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

18 Coolant / Antifreeze parts are listed for the 2021 Toyota Sienna, from PRESTONE, PEAK, AISIN and 4 other brands. FVP MV5050GAL 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, FVP, PEAK and PRESTONE supply 3 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 hard pipes and extra hoses in the coolant circuit. Read more

One part is listed for the 2021 Toyota Sienna — CONTINENTAL 63602.

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 Sienna come from 2 brands — MOTORAD and CALORSTAT.

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 Sienna.

This group includes MOTORAD 3124 and MOTORAD 3125.

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 Sienna come from 5 brands — DORMAN, CSF, TECHPRO and 2 other brands. 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 CSF, TECHPRO and TYC. 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 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

5 Radiator parts are listed for the 2021 Toyota Sienna, from GPD, TECHPRO, CSF and 2 other brands. CSF 3954 carries the "Popular" badge.

Economy: 2 parts, from GPD and TECHPRO. A representative part number is GPD 13913C.

The Standard Replacement section: 3 options from CSF, KOYORAD and TYC. CSF 3954 is listed in this group.

Listed part numbers: CSF 3954, GPD 13913C and TECHPRO TO3010378, plus the other 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

5 Radiator Cap parts are listed for the 2021 Toyota Sienna, 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.

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 2021 Toyota Sienna come from 6 brands — GPD, TECHPRO, VARIOUS MFR and 3 other brands. The "Popular" part is TYC 625010.

The Economy section: 3 options from GPD, TECHPRO and VARIOUS MFR. GPD 2812293 is listed in this group.

Standard Replacement: 3 parts, from TYC, ACKOJA and UAC. A representative part number is TYC 625010.

Listed part numbers: TYC 625010, GPD 2812293 and TECHPRO TO3115218, 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

2 Radiator Hose parts for the 2021 Toyota Sienna come from CONTINENTAL.

Listed part numbers: CONTINENTAL 66231 and CONTINENTAL 67231.

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

6 Temperature Sender / Sensor parts are listed for the 2021 Toyota Sienna, from GPD, AISIN, STANDARD MOTOR PRODUCTS and 3 other brands. AISIN THSAZ8004 carries the "Popular" badge.

Economy: 1 part, from GPD. A representative part number is GPD 1814519.

The Standard Replacement section: 5 options from AISIN, STANDARD MOTOR PRODUCTS, BECK/ARNLEY and 2 other brands. AISIN THSAZ8004 is listed in this group.

Listed part numbers: AISIN THSAZ8004, GPD 1814519 and STANDARD MOTOR PRODUCTS TX319, plus the other parts 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

6 Thermostat parts for the 2021 Toyota Sienna come from 6 brands — AUTOTECNICA, AISIN, MOTORAD and 3 other brands. The "Popular" part is AISIN THT023.

The Economy section: 1 option from AUTOTECNICA. AUTOTECNICA TY0719461 is listed in this group.

Standard Replacement: 5 parts, from AISIN, MOTORAD, BECK/ARNLEY and 2 other brands. A representative part number is AISIN THT023.

Listed part numbers: AISIN THT023, AUTOTECNICA TY0719461 and MOTORAD 1115180, plus the other parts above.

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

5 Thermostat Housing / Water Outlet parts for the 2021 Toyota Sienna 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.

This group includes SKP SK86328, GATES CO35085 and GATES CO35034 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

6 Water Pump parts for the 2021 Toyota Sienna come from 5 brands — BECK/ARNLEY, ACKOJA, SKP and 2 other brands. The "Popular" part is BECK/ARNLEY 1312557.

The Economy section: 4 options from BECK/ARNLEY, ACKOJA and SKP. BECK/ARNLEY 1312557 is listed in this group.

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

Listed part numbers: BECK/ARNLEY 1312557, ACKOJA A70160016 and BECK/ARNLEY 1312565, plus the other parts above.

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 Sienna, from MAHLE / CLEVITE and VICTOR REINZ.

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