5 Cooling system parts are listed for the 2026 Kia Niro, in 3 part types, covering the 1.6L 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 2026 Kia Niro keeps operating temperature in the narrow band the engine was designed for, from radiator and water pump to thermostat and hoses. All 5 listed parts are Coolant / Antifreeze (3 parts), Thermostat (1 part) and Thermostat Housing / Water Outlet (1 part).
The 2026 Kia Niro came with a single engine, the 1.6L L4 ELECTRIC/GAS, and every part is verified against it.
3 brands supply cooling system parts for the 2026 Kia Niro, led by VALVOLINE (2 parts), MOTORAD (2 parts) and PENTOSIN (1 part).
Each part number listed for the 2026 Kia Niro opens a page with every vehicle that part fits.
Coolant / Antifreeze
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| PENTOSIN | 8115209 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Pentofrost A41 Gallon | View on Amazon |
| VALVOLINE | 861398 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Asian Vehicle Blue1 Gallon | View on Amazon |
| VALVOLINE | 898406 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Hybrid Vehicle1 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.
3 Coolant / Antifreeze parts are listed for the 2026 Kia Niro, from VALVOLINE and PENTOSIN.
Part numbers include PENTOSIN 8115209, VALVOLINE 861398 and VALVOLINE 898406.
Thermostat
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| MOTORAD | 1212190 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Includes 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.
This group shows a single part: MOTORAD 1212190.
Thermostat Housing / Water Outlet
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| MOTORAD | CH1098 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Thermostat Housing | View on Amazon |
This table covers the housings and outlets the thermostat sits in.
This group shows a single part: MOTORAD CH1098.
Buying Cooling System Parts for a 2026 Kia Niro
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 1.6L 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 Thermostat .
Frequently Asked Questions
How many cooling system parts fit the 2026 Kia Niro?
Our catalog currently lists 5 cooling system parts for the 2026 Kia Niro across 3 subcategories and 3 brands, covering the 1.6L L4 ELECTRIC/GAS engine. Each part is matched to the engine(s) it fits.
What are the signs of cooling system problems on a 2026 Kia Niro?
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 2026 Kia Niro 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 2026 Kia Niro?
Every part on this page is matched to the 1.6L 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 2026 Kia Niro
Cooling System Parts for Other Kia Niro Years
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Manufacturer names, model designations and part numbers are used for identification and fitment reference only. AutoFactsDB is an independent catalog and is not affiliated with, endorsed by, or sponsored by any vehicle manufacturer displayed on this page.