This page lists 36 cooling system parts for the 2025 Mazda 3, across 11 part types, covering the 2.5L L4 Turbocharged engine. Every part shows its brand, manufacturer part number and fitment notes.
On the 2025 Mazda 3, 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. 18 parts of the 36 listed are Coolant / Antifreeze (9 parts), Water Pump (5 parts) and Radiator (4 parts). The other 8 part types cover the remaining 18 parts.
The 2025 Mazda 3 came with a single engine, the 2.5L L4 Turbocharged, and every part is verified against it.
18 brands supply cooling system parts for the 2025 Mazda 3, led by MAHLE / CLEVITE (6 parts), PRESTONE (5 parts) and MOTORAD (4 parts), plus 15 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 2025 Mazda 3. 3 parts have it, including PRESTONE AF2100 (Coolant / Antifreeze) and GATES 42204BH (Water Pump). 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 |
|---|---|---|---|---|
| PRESTONE | AF3100 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Prime Yellow - All VehiclesExtended Life | 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 |
| PRESTONE | AF6610 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | MAX Asian Green1 Gallon | 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 |
| 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.
9 Coolant / Antifreeze parts are listed for the 2025 Mazda 3, from PRESTONE, VALVOLINE and PENTOSIN. PRESTONE AF2100 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, PRESTONE and VALVOLINE supply 2 parts: the catalog's value-priced group. A representative part number is PRESTONE AF3100.
The Premium section lists 3 options from PRESTONE — a step above OE specification in materials, tolerances or warranty terms. PRESTONE AF2100 is listed in this group.
The Standard Replacement section lists 3 options from VALVOLINE and PENTOSIN — built to original-equipment specification. VALVOLINE 861398 is listed in this group.
This group includes PRESTONE AF2100, PRESTONE AF3055 and PRESTONE AF3100 and the remaining parts above.
Coolant Hose / Pipe Seal
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| MAHLE / CLEVITE | C33644 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Engine Coolant Outlet O-RingMolded Rubber | View on Amazon |
This table covers the seals at the Coolant Hose / Pipe. 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.
This group shows a single part: MAHLE / CLEVITE C33644.
Cooling System Tester Adapter
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| MOTORAD | 3121 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | StandardRadiator Cap Adapter | View on Amazon |
This table covers the adapters used to pressure-test this cooling system.
One part is listed for the 2025 Mazda 3 — MOTORAD 3121.
Intercooler Gasket
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| MAHLE / CLEVITE | GS34075 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Set | View on Amazon |
This table covers the gaskets that seal the Intercooler. 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.
This group shows a single part: MAHLE / CLEVITE GS34075.
Radiator
Economy
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| GPD | 13931C | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| FVP | RAD13931 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | 3 Base ModelFor vehicle built in Japan | View on Amazon |
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| FVP | RAD13968 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | 3 Base Model | View on Amazon |
| FVP | RAD14030 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | 3 Base ModelMexico Built | 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.
4 Radiator parts are listed for the 2025 Mazda 3, from FVP and GPD.
Economy: 1 part, from GPD. A representative part number is GPD 13931C.
The Standard Replacement section: 1 option from FVP. FVP RAD13931 is listed in this group.
2 ungrouped parts are not assigned to a grade, with the same engine-level match.
Listed part numbers: GPD 13931C, FVP RAD13931 and FVP RAD13968, plus the other parts above.
Radiator Cap
Locking Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| MOTORAD | ST16R | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Safety LeverIndicator Markings Color: Blue, Red | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| MOTORAD | 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.
MOTORAD supplies both parts for the 2025 Mazda 3.
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 ST16R is listed in this group.
The Standard Replacement section: 1 option from MOTORAD. MOTORAD T16R is listed in this group.
This group includes MOTORAD ST16R and MOTORAD T16R.
Temperature Sender / Sensor
Economy
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| HOLSTEIN | 2CTS0413 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | 3 Base Model | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| NISSENS | 207098 | 🇺🇸 US | View on Amazon | |
| STANDARD MOTOR PRODUCTS | TX308 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | 3 Base Model | View on Amazon |
| WELLS | 5S12433 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Connector Shape: Rectangular | 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.
4 Temperature Sender / Sensor parts are listed for the 2025 Mazda 3, from HOLSTEIN, NISSENS, STANDARD MOTOR PRODUCTS and 1 other brand.
Economy: 1 part, from HOLSTEIN. A representative part number is HOLSTEIN 2CTS0413.
The Standard Replacement section: 3 options from NISSENS, STANDARD MOTOR PRODUCTS and WELLS. NISSENS 207098 is listed in this group.
This group includes HOLSTEIN 2CTS0413, NISSENS 207098 and STANDARD MOTOR PRODUCTS TX308 and the remaining parts above.
Thermostat
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| AISIN | THZ008 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Includes Thermostat Seal | View on Amazon |
| CALORSTAT | TH741888J | 🇺🇸 US | 190.0 F Degrees | View on Amazon |
| FOUR SEASONS | 86366 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | 3 Base Model | View on Amazon |
| MOTORAD | 1073190 | 🇺🇸 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.
4 Thermostat parts for the 2025 Mazda 3 come from 4 brands — AISIN, CALORSTAT, FOUR SEASONS and 1 other brand.
Listed part numbers: AISIN THZ008, CALORSTAT TH741888J and FOUR SEASONS 86366, plus the other parts above.
Thermostat / Thermostat Housing / Water Outlet Seal
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| FEL-PRO | 36216 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Lower3 Base Model | View on Amazon |
| MAHLE / CLEVITE | C33695 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Molded Rubber | View on Amazon |
| MAHLE / CLEVITE | C33800 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Beaded Steel | View on Amazon |
| MAHLE / CLEVITE | C33807 | 🇺🇸 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.
4 Thermostat / Thermostat Housing / Water Outlet Seal parts are listed for the 2025 Mazda 3, from MAHLE / CLEVITE and FEL-PRO.
This group includes FEL-PRO 36216, MAHLE / CLEVITE C33695 and MAHLE / CLEVITE C33800 and the remaining parts above.
Water Pump
Economy
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| FVP | US8205 | 🇺🇸 US | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| GATES Popular | 42204BH | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | View on Amazon | |
| AISIN | WPZ045 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | without Housing ULTRA-Premium OE Replacement | View on Amazon |
| DAYCO | DP1899 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | 3 Base ModelFor vehicle built in Japan | View on Amazon |
| GMB | 1452570 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | 3 Base Model | 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.
5 Water Pump parts for the 2025 Mazda 3 come from 5 brands — FVP, GATES, AISIN and 2 other brands. The "Popular" part is GATES 42204BH.
The Economy section: 1 option from FVP. FVP US8205 is listed in this group.
Standard Replacement: 4 parts, from GATES, AISIN, DAYCO and 1 other brand. A representative part number is GATES 42204BH.
Part numbers include GATES 42204BH, FVP US8205 and AISIN WPZ045, among others listed above.
Water Pump Gasket
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| MAHLE / CLEVITE | C33643 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Molded 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.
One part is listed for the 2025 Mazda 3 — MAHLE / CLEVITE C33643.
Buying Cooling System Parts for a 2025 Mazda 3
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 2025 Mazda 3?
Our catalog currently lists 36 cooling system parts for the 2025 Mazda 3 across 11 subcategories and 18 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 2025 Mazda 3?
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 2025 Mazda 3 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 2025 Mazda 3?
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 2025 Mazda 3
Cooling System Parts for Other Mazda 3 Years
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