55 Cooling system parts are listed for the 2021 Honda Insight, in 12 part types, covering the 1.5L L4 ELECTRIC/GAS engine. Each one has a brand, a manufacturer part number and notes that say where it fits.
The cooling system system on the 2021 Honda Insight keeps operating temperature in the narrow band the engine was designed for, from radiator and water pump to thermostat and hoses. The largest groups are Coolant / Antifreeze (17 parts), Temperature Sender / Sensor (7 parts) and Water Pump (6 parts). The other 9 part types cover the remaining 25 parts.
The 2021 Honda Insight came with a single engine, the 1.5L L4 ELECTRIC/GAS, and every part is verified against it.
27 brands supply cooling system parts for the 2021 Honda Insight, led by PRESTONE (5 parts), BECK/ARNLEY (5 parts) and MOTORAD (5 parts), plus 24 more brands. Quality grades include Standard Replacement, Economy and Premium.
A "Popular" badge means the source catalog flagged the part as frequently chosen for the 2021 Honda Insight. 10 parts have it, including FVP MV5050GAL (Coolant / Antifreeze) and TYC 13859 (Radiator). Each part number opens a page with every vehicle that part fits.
Coolant / Antifreeze
Compatible With All Colors
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| PRESTONE | AF3055 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Prime YellowAll Vehicles | View on Amazon |
Economy
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| FVP Popular | MV5050GAL | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Extended LifeAll Makes / All Models | View on Amazon |
| PRESTONE Popular | AF3100 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Prime Yellow - All VehiclesExtended Life | View on Amazon |
| PEAK | BQA1GAL | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Blue Mountain Long LifeAll Vehicle | View on Amazon |
| VALVOLINE | 719009 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Multi-Vehicle Yellow1 Gallon | View on Amazon |
Premium
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| PRESTONE Popular | AF2100 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | All Vehicles10yr/300k mi | View on Amazon |
| PEAK | PKP1GAL | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | All Vehicles Antifreeze1 Gallon | View on Amazon |
| PEAK | PXA1GAL | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Global Lifetime1 Gallon | View on Amazon |
| PRESTONE | AF6310 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | MAX Original EquipmentAsian Blue | View on Amazon |
| PRESTONE | AFMAX | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Max Universal1 Gallon | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| VALVOLINE Popular | 861398 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Asian Vehicle Blue1 Gallon | View on Amazon |
| AISIN | ACB003 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | BlueHOAT | View on Amazon |
| BECK/ARNLEY | 2521501 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Premium Extra Life BlueAsian | View on Amazon |
| BECK/ARNLEY | 2521001 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Premium Green1 Gallon | View on Amazon |
| PEAK | PAB1GAL | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | OET Asian Extended Life Blue1 Gallon | View on Amazon |
| PENTOSIN | 8115207 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Pentofrost A31 Gallon | View on Amazon |
| VALVOLINE | 888418 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Asian Vehicle Green1 Gallon | View on Amazon |
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.
17 Coolant / Antifreeze parts are listed for the 2021 Honda Insight, 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, PRESTONE, PEAK and 1 other brand supply 4 parts: the catalog's value-priced group. A representative part number is FVP MV5050GAL.
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 VALVOLINE, BECK/ARNLEY, AISIN and 2 other brands — built to original-equipment specification. VALVOLINE 861398 is listed in this group.
Coolant Reservoir Cap
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| CALORSTAT | RC0174 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | View on Amazon | |
| MOTORAD | T108 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Standard | View on Amazon |
| MOTORAD | T128 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Standard | View on Amazon |
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.
3 Coolant Reservoir Cap parts for the 2021 Honda Insight come from 2 brands — MOTORAD and CALORSTAT.
Part numbers include CALORSTAT RC0174, MOTORAD T108 and MOTORAD T128.
Cooling System Tester Adapter
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| GATES | 31409 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Cooling System Pressure | View on Amazon |
This table covers the adapters used to pressure-test this cooling system.
One part is listed for the 2021 Honda Insight — GATES 31409.
Radiator
Economy
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| GPD | 13859C | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | View on Amazon | |
| TECHPRO | HO3010254 | 🇺🇸 US 🇨🇦 CA | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| TYC Popular | 13859 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | View on Amazon | |
| KOYORAD | A13859 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | External Oil Cooler | View on Amazon |
| UAC | RA13859C | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | View on Amazon |
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.
5 Radiator parts are listed for the 2021 Honda Insight, from GPD, TECHPRO, TYC and 2 other brands. TYC 13859 carries the "Popular" badge.
Economy: 2 parts, from GPD and TECHPRO. A representative part number is GPD 13859C.
The Standard Replacement section: 3 options from TYC, KOYORAD and UAC. TYC 13859 is listed in this group.
Listed part numbers: TYC 13859, GPD 13859C and TECHPRO HO3010254, plus the other parts above.
Radiator Cap
Locking Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| MOTORAD | ST37 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Safety LeverIndicator Markings Color: Silver | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| GATES Popular | 31412 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | OE Type | View on Amazon |
| CALORSTAT | RC0040 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Includes 2 sealsMetallic | View on Amazon |
| MOTORAD | T37 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | StandardIncludes Hose | View on Amazon |
| SKP | SK10242 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | 16 psi Pressure Rating | View on Amazon |
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.
5 Radiator Cap parts are listed for the 2021 Honda Insight, 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.
Part numbers include GATES 31412, MOTORAD ST37 and CALORSTAT RC0040, among others listed above.
Radiator Fan Assembly
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| TECHPRO | HO3115175 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | View on Amazon |
This table covers the fan assemblies (and clutches, where listed) that pull air through the radiator.
This group shows a single part: TECHPRO HO3115175.
Radiator Mount Bushing
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| DORMAN | 927240 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Fits Right Lower | View on Amazon |
| DORMAN | 927241 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Fits Left Upper | View on Amazon |
This table covers the Radiator Mount bushings. Typical signs include a clunk over bumps, or a torn or walked-out bushing you can see. Press the new bushing square. A cocked bushing will tear in a few thousand miles.
2 Radiator Mount Bushing parts for the 2021 Honda Insight come from DORMAN.
Part numbers include DORMAN 927240 and DORMAN 927241.
Temperature Sender / Sensor
Economy
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| CALORSTAT | WS3039 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | View on Amazon | |
| GPD | 1712488 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | with 2 Terminal(s)with M10 x 1.25 Thread | View on Amazon |
| HOLSTEIN | 2CTS0124 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Panasonic | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| WALKER PRODUCTS Popular | 2111080 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Sensor Only | View on Amazon |
| WELLS Popular | 5S8970 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Wiring Harness Included: No | View on Amazon |
| BECK/ARNLEY | 1581676 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Location - Water Outlet | View on Amazon |
| NTK | EF0176 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | View on Amazon |
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.
7 Temperature Sender / Sensor parts are listed for the 2021 Honda Insight, from CALORSTAT, GPD, HOLSTEIN and 4 other brands. WALKER PRODUCTS 2111080 carries the "Popular" badge.
Economy: 3 parts, from CALORSTAT, GPD and HOLSTEIN. A representative part number is CALORSTAT WS3039.
The Standard Replacement section: 4 options from WALKER PRODUCTS, WELLS, BECK/ARNLEY and 1 other brand. WALKER PRODUCTS 2111080 is listed in this group.
This group includes WALKER PRODUCTS 2111080, CALORSTAT WS3039 and GPD 1712488 and the remaining parts above.
Thermostat
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| AISIN | THH022 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | 78°C | View on Amazon |
| BECK/ARNLEY | 1430990 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | View on Amazon | |
| MOTORAD | 1214172 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Includes Housing, Seal | View on Amazon |
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.
3 Thermostat parts for the 2021 Honda Insight come from 3 brands — AISIN, BECK/ARNLEY and MOTORAD.
Part numbers include AISIN THH022, BECK/ARNLEY 1430990 and MOTORAD 1214172.
Thermostat / Thermostat Housing / Water Outlet Seal
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| ELRING | 108130 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Material: EPDM ethylene propylene diene Monomer (M-class) rubber | View on Amazon |
| FEL-PRO | 35741 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Thermostat to Thermostat Housing | View on Amazon |
| MAHLE / CLEVITE | C32021 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Molded Rubber | View on Amazon |
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.
3 Thermostat / Thermostat Housing / Water Outlet Seal parts are listed for the 2021 Honda Insight, from ELRING, FEL-PRO and MAHLE / CLEVITE.
Listed part numbers: ELRING 108130, FEL-PRO 35741 and MAHLE / CLEVITE C32021.
Water Pump
Economy
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| BECK/ARNLEY Popular | 1312544 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | View on Amazon | |
| US MOTOR WORKS Popular | US8185 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | View on Amazon | |
| SKP | SKUS8185 | 🇺🇸 US 🇨🇦 CA | EX Model or LX Model or Touring | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| AISIN | WQH001 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | AuxiliaryInverter Cooler Water Pump | View on Amazon |
| FOUR SEASONS | 89075 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Auxiliary | View on Amazon |
| NISSENS | 833807 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Auxiliary | View on Amazon |
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.
6 Water Pump parts for the 2021 Honda Insight come from 6 brands — BECK/ARNLEY, US MOTOR WORKS, SKP and 3 other brands. The "Popular" part is BECK/ARNLEY 1312544.
The Economy section: 3 options from BECK/ARNLEY, US MOTOR WORKS and SKP. BECK/ARNLEY 1312544 is listed in this group.
Standard Replacement: 3 parts, from AISIN, FOUR SEASONS and NISSENS. A representative part number is AISIN WQH001.
Part numbers include BECK/ARNLEY 1312544, US MOTOR WORKS US8185 and SKP SKUS8185, among others listed above.
Water Pump Gasket
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| FEL-PRO | 36174 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | To Block | View on Amazon |
| MAHLE / CLEVITE | K32737 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Rubber | View on Amazon |
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.
2 Water Pump Gasket parts are listed for the 2021 Honda Insight, from FEL-PRO and MAHLE / CLEVITE.
Listed part numbers: FEL-PRO 36174 and MAHLE / CLEVITE K32737.
Buying Cooling System Parts for a 2021 Honda Insight
On this vehicle, the cooling system system keeps operating temperature in the narrow band the engine was designed for, from radiator and water pump to thermostat and hoses.
- Confirm you have the 1.5L L4 ELECTRIC/GAS engine — every part on this page is matched to it.
- Read the notes on each row for position, trim and spec qualifiers before you order.
- Where labor overlaps, replace the thermostat and refill with fresh coolant whenever you change a water pump or radiator; original hoses on an older vehicle are on borrowed time.
- Cross-reference the manufacturer part number against your old part or a service-manual listing.
Start with the largest groups on this page: Coolant / Antifreeze and Temperature Sender / Sensor .
Frequently Asked Questions
How many cooling system parts fit the 2021 Honda Insight?
Our catalog currently lists 55 cooling system parts for the 2021 Honda Insight across 12 subcategories and 27 brands, covering the 1.5L L4 ELECTRIC/GAS engine. Each part is matched to the engine(s) it fits.
What are the signs of cooling system problems on a 2021 Honda Insight?
Common symptoms include a rising temperature gauge in traffic, sweet-smelling steam, crusty deposits around hose clamps, or a heater that blows cold. If you notice any of these, identify the affected subcategory above and cross-reference the part numbers listed.
What should I replace at the same time?
Where labor overlaps, replace the thermostat and refill with fresh coolant whenever you change a water pump or radiator; original hoses on an older vehicle are on borrowed time.
What do the market flags (US, CA, MX) on each part mean?
They show the market for which the manufacturer published application data for that part — where the vehicle was first sold, not where the part was made. If your 2021 Honda Insight was originally sold in the US, the safest choice is a part marked for the US market.
How do I make sure a part fits my 2021 Honda Insight?
Every part on this page is matched to the 1.5L L4 ELECTRIC/GAS engine. Then replace coolant with the exact specification the manufacturer calls for — mixing chemistries can gel and block small passages. The notes column carries position and trim qualifiers where they apply.
Other Parts for the 2021 Honda Insight
Cooling System Parts for Other Honda Insight Years
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