2021 Toyota Tundra 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 2021 Toyota Tundra, from PRESTONE, PEAK, VALVOLINE 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, 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 7 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 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

This group shows a single part: MOTORAD T166.

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

MOTORAD supplies both parts for the 2021 Toyota Tundra.

This group includes MOTORAD 3124 and MOTORAD 3125.

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

8 Radiator parts are listed for the 2021 Toyota Tundra, from GPD, SPECTRA PREMIUM, TYC and 5 other brands. SPECTRA PREMIUM CU2994 carries the "Popular" badge.

Economy: 1 part, from GPD. A representative part number is GPD 13681C.

The Standard Replacement section: 7 options from SPECTRA PREMIUM, TYC, FVP and 4 other brands. SPECTRA PREMIUM CU2994 is listed in this group.

Part numbers include SPECTRA PREMIUM CU2994, GPD 13681C and TYC 13681, among others listed 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 Tundra, from MOTORAD, GATES, CALORSTAT and 1 other brand. GATES 31412 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 ST37 is listed in this group.

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

This group includes GATES 31412, MOTORAD ST37 and CALORSTAT RC0040 and the remaining parts above.

This table covers the Radiator Fan blades. Typical signs include chatter, streaks, or a skip at the top of the stroke. Confirm left and right lengths in the notes — they are often different. Read more

3 Radiator Fan Blade parts for the 2021 Toyota Tundra come from 3 brands — AISIN, DORMAN and SKP.

This group includes AISIN FNT031, DORMAN 620573 and SKP SK38070.

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

7 Radiator Fan Clutch parts are listed for the 2021 Toyota Tundra, from FVP, HAYDEN, US MOTOR WORKS and 3 other brands. HAYDEN 6630 carries the "Popular" badge.

Part numbers include HAYDEN 6630, US MOTOR WORKS 22408 and FOUR SEASONS 46091, among others listed above.

This table covers the brackets that mount the Radiator Fan Clutch Bearing. Typical signs include a cracked mount, a rattle, or a bracket that no longer holds alignment. Confirm position in the notes. Many brackets look alike and bolt to different corners. Read more

One part is listed for the 2021 Toyota Tundra — GATES FB1023.

This table covers the shrouds that duct air through the fan and radiator. Read more

3 Radiator Fan Shroud parts are listed for the 2021 Toyota Tundra, from DORMAN, TECHPRO and VDO / CONTINENTAL.

Part numbers include DORMAN 603049, TECHPRO TO3110187 and VDO / CONTINENTAL FA74093.

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

8 Radiator Hose parts for the 2021 Toyota Tundra come from 4 brands — GATES, ACDELCO, CONTINENTAL and 1 other brand. The "Popular" part is GATES 23309.

Part numbers include GATES 23309, GATES 23310 and ACDELCO 22601M, among others listed above.

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 2021 Toyota Tundra, from ULTRA-POWER, GPD, HOLSTEIN and 9 other brands. ULTRA-POWER 5S1616 carries the "Popular" badge.

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

The Standard Replacement section: 8 options from DELPHI, DENSO, BECK/ARNLEY and 5 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

10 Thermostat parts for the 2021 Toyota Tundra come from 10 brands — AUTOTECNICA, DORMAN, SKP and 7 other brands. The "Popular" part is AISIN THT005.

The Economy section: 3 options from AUTOTECNICA, DORMAN and SKP. AUTOTECNICA TY0715902PRM is listed in this group.

Standard Replacement: 7 parts, from AISIN, MOTORAD, ACKOJA and 4 other brands. A representative part number is AISIN THT005.

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

4 Thermostat / Thermostat Housing / Water Outlet Seal parts are listed for the 2021 Toyota Tundra, from APEX and FEL-PRO.

This group includes APEX AWO2327, APEX AWO2272 and FEL-PRO 35891 and the remaining parts above.

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

3 Thermostat Housing / Water Outlet parts for the 2021 Toyota Tundra come from 2 brands — MOTORAD and ULTRA-POWER.

The Economy section: 1 option from ULTRA-POWER. ULTRA-POWER 9025136 is listed in this group.

Standard Replacement: 2 parts, from MOTORAD. A representative part number is MOTORAD CH1044.

This group includes ULTRA-POWER 9025136, MOTORAD CH1044 and MOTORAD CH1043.

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

2 Water Inlet Gasket parts are listed for the 2021 Toyota Tundra, from APEX and FEL-PRO.

Listed part numbers: APEX AWO2273 and FEL-PRO 35893.

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

9 Water Pump parts for the 2021 Toyota Tundra come from 9 brands — BECK/ARNLEY, FVP, SKP and 6 other brands. The "Popular" part is ACDELCO 252951.

The Economy section: 4 options from BECK/ARNLEY, FVP, SKP and 1 other brand. BECK/ARNLEY 1312403 is listed in this group.

Standard Replacement: 5 parts, from ACDELCO, AISIN, DAYCO and 2 other brands. A representative part number is ACDELCO 252951.

This group includes ACDELCO 252951, BECK/ARNLEY 1312403 and FVP US6197 and the remaining 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

3 Water Pump Gasket parts are listed for the 2021 Toyota Tundra, from AJUSA, APEX and FEL-PRO.

Listed part numbers: AJUSA 01699800, APEX AWP3230 and FEL-PRO 35889.