This page lists 20 cooling system parts for the 2018 Mazda 2, across 5 part types, covering the 1.5L L4 engine. Every part shows its brand, manufacturer part number and fitment notes.
The cooling system system on the 2018 Mazda 2 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 (13 parts), Radiator Cap (3 parts) and Cooling System Tester Adapter (2 parts). The other 2 part types cover the remaining 2 parts.
Every part on this page is matched to the 1.5L L4 — the only engine offered in the 2018 Mazda 2.
The most listed brands for 2018 Mazda 2 cooling system parts are PRESTONE (5 parts), PEAK (4 parts) and MOTORAD (4 parts), plus 6 more brands. Quality grades include Premium, Standard Replacement and Economy.
3 parts on this 2018 Mazda 2 page carry a "Popular" badge — the source catalog's flag for options frequently chosen for this vehicle — including FVP MV5050GAL (Coolant / Antifreeze) and PRESTONE AF2100 (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 | AF3055 | 🇲🇽 MX | Prime YellowAll Vehicles | View on Amazon |
Economy
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| FVP Popular | MV5050GAL | 🇲🇽 MX | Extended LifeAll Makes / All Models | View on Amazon |
| PEAK | BQA1GAL | 🇲🇽 MX | Blue Mountain Long LifeAll Vehicle | View on Amazon |
| PRESTONE | AF3100 | 🇲🇽 MX | Prime Yellow - All VehiclesExtended Life | View on Amazon |
Heavy Duty
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| VALVOLINE | 846439 | 🇲🇽 MX | HD Nitrite Free Extended Life Yellow1 Gallon | View on Amazon |
Premium
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| PRESTONE Popular | AF2100 | 🇲🇽 MX | All Vehicles10yr/300k mi | View on Amazon |
| PEAK | PKP1GAL | 🇲🇽 MX | All Vehicles Antifreeze1 Gallon | View on Amazon |
| PEAK | PXA1GAL | 🇲🇽 MX | Global Lifetime1 Gallon | View on Amazon |
| PRESTONE | AF6610 | 🇲🇽 MX | MAX Asian Green1 Gallon | View on Amazon |
| PRESTONE | AFMAX | 🇲🇽 MX | Max Universal1 Gallon | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| VALVOLINE Popular | 861398 | 🇲🇽 MX | Asian Vehicle Blue1 Gallon | View on Amazon |
| AISIN | ACG004 | 🇲🇽 MX | GreenPOAT | View on Amazon |
| PEAK | PAG1GAL | 🇲🇽 MX | OET Asian Extended Life 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.
13 Coolant / Antifreeze parts for the 2018 Mazda 2 come from 5 brands — PRESTONE, PEAK, VALVOLINE and 2 other brands. The "Popular" part is FVP MV5050GAL.
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 3 options from FVP, PEAK and PRESTONE — the catalog's value-priced group. FVP MV5050GAL is listed in this group.
In the Heavy Duty grade, VALVOLINE supplies 1 part: rated for severe service. A representative part number is VALVOLINE 846439.
In the Premium grade, PRESTONE and PEAK supply 5 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, AISIN and PEAK supply 3 parts: built to original-equipment specification. A representative part number is VALVOLINE 861398.
Coolant Hose / Pipe Seal
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| AJUSA | 16564000 | 🇲🇽 MX | COOLANT PIPE | 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.
One part is listed for the 2018 Mazda 2 — AJUSA 16564000.
Cooling System Tester Adapter
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| MOTORAD | 3124 | 🇲🇽 MX | StandardRadiator Cap Adapter | View on Amazon |
| MOTORAD | 3125 | 🇲🇽 MX | Standard | View on Amazon |
This table covers the adapters used to pressure-test this cooling system.
2 Cooling System Tester Adapter parts for the 2018 Mazda 2 come from MOTORAD.
Listed part numbers: MOTORAD 3124 and MOTORAD 3125.
Radiator
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| NISSENS | 606110 | 🇲🇽 MX | Brazed cooling fins | 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.
This group shows a single part: NISSENS 606110.
Radiator Cap
Locking Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| ACDELCO | 12R07 | 🇺🇸 US 🇨🇦 CA | Professional | View on Amazon |
| MOTORAD | ST37 | 🇲🇽 MX | Safety LeverIndicator Markings Color: Silver | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| MOTORAD | T37 | 🇲🇽 MX | StandardIncludes Hose | 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.
3 Radiator Cap parts for the 2018 Mazda 2 come from 2 brands — MOTORAD and ACDELCO.
In the Locking Replacement grade, ACDELCO and MOTORAD supply 2 parts: grouped under the catalog's "Locking Replacement" designation — the notes column spells out what sets them apart. A representative part number is ACDELCO 12R07.
Standard Replacement: 1 part, from MOTORAD. A representative part number is MOTORAD T37.
This group includes ACDELCO 12R07, MOTORAD ST37 and MOTORAD T37.
Buying Cooling System Parts for a 2018 Mazda 2
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 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 Radiator Cap .
Frequently Asked Questions
How many cooling system parts fit the 2018 Mazda 2?
Our catalog currently lists 20 cooling system parts for the 2018 Mazda 2 across 5 subcategories and 9 brands, covering the 1.5L L4 engine. Each part is matched to the engine(s) it fits.
What are the signs of cooling system problems on a 2018 Mazda 2?
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 2018 Mazda 2 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 2018 Mazda 2?
Every part on this page is matched to the 1.5L L4 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 2018 Mazda 2
Cooling System Parts for Other Mazda 2 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.