2025 Mazda CX-30 Cooling System Parts

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. Read more

10 Coolant / Antifreeze parts are listed for the 2025 Mazda CX-30, from PRESTONE, VALVOLINE and PENTOSIN. PRESTONE AF2100 carries the "Popular" badge. All of them fit every engine offered in the 2025 CX-30.

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 Heavy Duty section lists 1 option from PRESTONE — rated for severe service. PRESTONE AFC12100 is listed in this group.

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 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. Read more

2 Coolant Hose / Pipe Seal parts for the 2025 Mazda CX-30 come from MAHLE / CLEVITE. 1 part fits every engine; the other 1 is engine-specific.

Part numbers include MAHLE / CLEVITE C33805 and MAHLE / CLEVITE C33644.

This table covers the overflow / expansion tanks that hold extra coolant. Read more

2 Coolant Reservoir parts for the 2025 Mazda CX-30 come from TECHPRO.

Part numbers include TECHPRO MA3014119 and TECHPRO MA3014120.

This table covers the adapters used to pressure-test this cooling system. Read more

One part is listed for the 2025 Mazda CX-30 — MOTORAD 3121.

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. Read more

This group shows a single part: MAHLE / CLEVITE GS34075.

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. Read more

One part is listed for the 2025 Mazda CX-30 — FVP RAD14030.

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. Read more

MOTORAD supplies both parts for the 2025 Mazda CX-30. All of them fit every engine offered in the 2025 CX-30.

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.

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. Read more

3 Temperature Sender / Sensor parts are listed for the 2025 Mazda CX-30, from HOLSTEIN, NISSENS and WELLS. All of them fit every engine offered in the 2025 CX-30.

Economy: 1 part, from HOLSTEIN. A representative part number is HOLSTEIN 2CTS0413.

The Standard Replacement section: 2 options from NISSENS and WELLS. NISSENS 207098 is listed in this group.

This group includes HOLSTEIN 2CTS0413, NISSENS 207098 and WELLS 5S12433.

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. Read more

2 Thermostat parts for the 2025 Mazda CX-30 come from 2 brands — BECK/ARNLEY and MOTORAD.

Part numbers include BECK/ARNLEY 1430989 and MOTORAD 1073190.

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. Read more

4 Thermostat / Thermostat Housing / Water Outlet Seal parts are listed for the 2025 Mazda CX-30, from MAHLE / CLEVITE and FEL-PRO.

Part numbers include FEL-PRO 36216, MAHLE / CLEVITE C33695 and MAHLE / CLEVITE C33800, among others listed above.

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. Read more

5 Water Pump parts for the 2025 Mazda CX-30 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.

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. Read more

One part is listed for the 2025 Mazda CX-30 — MAHLE / CLEVITE C33643.