This page lists 8 cooling system parts for the 2026 Mazda CX-30, across 4 part types, covering the 2.5L L4 Turbocharged engine. Every part shows its brand, manufacturer part number and fitment notes.
The cooling system system on the 2026 Mazda CX-30 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 (4 parts), Water Pump (2 parts) and Temperature Sender / Sensor (1 part). The other 1 part type covers the remaining 1 part.
Every part on this page is matched to the 2.5L L4 Turbocharged — the only engine offered in the 2026 Mazda CX-30.
The most listed brands for 2026 Mazda CX-30 cooling system parts are VALVOLINE (3 parts), PENTOSIN (1 part) and HOLSTEIN (1 part), plus 3 more brands. Quality grades include Standard Replacement and Economy.
Each part number listed for the 2026 Mazda CX-30 opens a page with every vehicle that part fits.
Coolant / Antifreeze
Economy
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| VALVOLINE | 719009 | 🇺🇸 US 🇨🇦 CA | Multi-Vehicle Yellow1 Gallon | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| PENTOSIN | 8115207 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Pentofrost A31 Gallon | View on Amazon |
| VALVOLINE | 861398 | 🇺🇸 US 🇨🇦 CA | Asian Vehicle Blue1 Gallon | View on Amazon |
| VALVOLINE | 888418 | 🇺🇸 US 🇨🇦 CA | 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.
4 Coolant / Antifreeze parts for the 2026 Mazda CX-30 come from 2 brands — VALVOLINE and PENTOSIN.
The Economy section lists 1 option from VALVOLINE — the catalog's value-priced group. VALVOLINE 719009 is listed in this group.
In the Standard Replacement grade, VALVOLINE and PENTOSIN supply 3 parts: built to original-equipment specification. A representative part number is PENTOSIN 8115207.
Part numbers include VALVOLINE 719009, PENTOSIN 8115207 and VALVOLINE 861398, among others listed above.
Temperature Sender / Sensor
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| HOLSTEIN | 2CTS0413 | 🇺🇸 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.
This group shows a single part: HOLSTEIN 2CTS0413.
Thermostat
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| CALORSTAT | TH741888J | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | 190.0 F Degrees | 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.
One part is listed for the 2026 Mazda CX-30 — CALORSTAT TH741888J.
Water Pump
Economy
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| US MOTOR WORKS | US8205 | 🇺🇸 US | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| DAYCO | DP1899 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Serpentine Belt Drivenwithout Back Housing | 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.
2 Water Pump parts are listed for the 2026 Mazda CX-30, from US MOTOR WORKS and DAYCO.
Economy: 1 part, from US MOTOR WORKS. A representative part number is US MOTOR WORKS US8205.
The Standard Replacement section: 1 option from DAYCO. DAYCO DP1899 is listed in this group.
This group includes US MOTOR WORKS US8205 and DAYCO DP1899.
Buying Cooling System Parts for a 2026 Mazda CX-30
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 2.5L L4 Turbocharged 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 Water Pump .
Frequently Asked Questions
How many cooling system parts fit the 2026 Mazda CX-30?
Our catalog currently lists 8 cooling system parts for the 2026 Mazda CX-30 across 4 subcategories and 6 brands, covering the 2.5L L4 Turbocharged engine. Each part is matched to the engine(s) it fits.
What are the signs of cooling system problems on a 2026 Mazda CX-30?
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-30 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-30?
Every part on this page is matched to the 2.5L L4 Turbocharged 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 Mazda CX-30
Cooling System Parts for Other Mazda CX-30 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.