This page lists 11 cooling system parts for the 2026 Mazda CX-90, across 2 part types, covering both the 2.5L L4 ELECTRIC/GAS and the 3.3L L6 Turbocharged. Every part shows its brand, manufacturer part number and fitment notes.
On the 2026 Mazda CX-90, 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. All 11 listed parts are Coolant / Antifreeze (9 parts) and Radiator Cap (2 parts).
The 2026 Mazda CX-90 was sold with both the 2.5L L4 ELECTRIC/GAS and the 3.3L L6 Turbocharged. All 11 parts on this page fit every engine.
The most listed brands for 2026 Mazda CX-90 cooling system parts are PRESTONE (6 parts), VALVOLINE (2 parts) and MOTORAD (2 parts), plus 1 more brand. Quality grades include Standard Replacement, Premium and Compatible With All Colors.
2 parts on this 2026 Mazda CX-90 page carry a "Popular" badge — the source catalog's flag for options frequently chosen for this vehicle — including PRESTONE AF2100 (Coolant / Antifreeze) and VALVOLINE 861398 (Coolant / Antifreeze). Click any part number to see every vehicle that part fits.
Coolant / Antifreeze
Compatible With All Colors
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| PRESTONE Fits: all 2026 CX-90 engines | AF3055 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Prime YellowAll Vehicles | View on Amazon |
Economy
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| PRESTONE Fits: all 2026 CX-90 engines | AF3100 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Prime Yellow - All VehiclesExtended Life | View on Amazon |
Heavy Duty
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| PRESTONE Fits: all 2026 CX-90 engines | AFC12100 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Command Nitrite Free Extended Life CoolantYellow Nitrite Free OAT | View on Amazon |
Premium
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| PRESTONE Popular Fits: all 2026 CX-90 engines | AF2100 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | All Vehicles10yr/300k mi | View on Amazon |
| PRESTONE Fits: all 2026 CX-90 engines | AF6610 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | MAX Asian Green1 Gallon | View on Amazon |
| PRESTONE Fits: all 2026 CX-90 engines | AFMAX | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Max Universal1 Gallon | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| VALVOLINE Popular Fits: all 2026 CX-90 engines | 861398 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Asian Vehicle Blue1 Gallon | View on Amazon |
| PENTOSIN Fits: all 2026 CX-90 engines | 8115207 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Pentofrost A31 Gallon | View on Amazon |
| VALVOLINE Fits: all 2026 CX-90 engines | 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.
9 Coolant / Antifreeze parts for the 2026 Mazda CX-90 come from 3 brands — PRESTONE, VALVOLINE and PENTOSIN. The "Popular" part is PRESTONE AF2100. Every part fits both the 2.5L L4 ELECTRIC/GAS and the 3.3L L6 Turbocharged.
In the Compatible With All Colors grade, PRESTONE supplies 1 part: grouped under the catalog's "Compatible With All Colors" designation — the notes column spells out what sets them apart. A representative part number is PRESTONE AF3055.
The Economy section lists 1 option from PRESTONE — the catalog's value-priced group. PRESTONE AF3100 is listed in this group.
In the Heavy Duty grade, PRESTONE supplies 1 part: rated for severe service. A representative part number is PRESTONE AFC12100.
In the Premium grade, PRESTONE supplies 3 parts: a step above OE specification in materials, tolerances or warranty terms. A representative part number is PRESTONE AF2100.
In the Standard Replacement grade, VALVOLINE and PENTOSIN supply 3 parts: built to original-equipment specification. A representative part number is VALVOLINE 861398.
Listed part numbers: PRESTONE AF2100, PRESTONE AF3055 and PRESTONE AF3100, plus the other parts above.
Radiator Cap
Locking Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| MOTORAD Fits: all 2026 CX-90 engines | ST16R | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Safety LeverIndicator Markings Color: Blue, Red | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| MOTORAD Fits: all 2026 CX-90 engines | T16R | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | StandardIndicator Markings Color: Silver | 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.
2 Radiator Cap parts for the 2026 Mazda CX-90 come from MOTORAD. Every part fits both the 2.5L L4 ELECTRIC/GAS and the 3.3L L6 Turbocharged.
In the Locking Replacement grade, MOTORAD supplies 1 part: grouped under the catalog's "Locking Replacement" designation — the notes column spells out what sets them apart. A representative part number is MOTORAD ST16R.
Standard Replacement: 1 part, from MOTORAD. A representative part number is MOTORAD T16R.
This group includes MOTORAD ST16R and MOTORAD T16R.
Buying Cooling System Parts for a 2026 Mazda CX-90
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.
- You do not need to pick an engine: every cooling system part on this page fits both the 2.5L L4 ELECTRIC/GAS and the 3.3L L6 Turbocharged.
- 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 Radiator Cap .
Frequently Asked Questions
How many cooling system parts fit the 2026 Mazda CX-90?
Our catalog currently lists 11 cooling system parts for the 2026 Mazda CX-90 across 2 subcategories and 4 brands, covering both the 2.5L L4 ELECTRIC/GAS and the 3.3L L6 Turbocharged. Each part is matched to the engine(s) it fits.
Do cooling system parts differ between 2026 Mazda CX-90 engines?
No. On this page every cooling system part fits both the 2.5L L4 ELECTRIC/GAS and the 3.3L L6 Turbocharged. You do not need to pick an engine to choose the right row — use the notes for position and trim.
What are the signs of cooling system problems on a 2026 Mazda CX-90?
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 Mazda CX-90 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 Mazda CX-90?
Every part on this page already fits both the 2.5L L4 ELECTRIC/GAS and the 3.3L L6 Turbocharged. 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 Mazda CX-90
Cooling System Parts for Other Mazda CX-90 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.