2021 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

18 Coolant / Antifreeze parts are listed for the 2021 Mazda CX-30, from PRESTONE, PEAK, VALVOLINE and 4 other brands. FVP MV5050GAL carries the "Popular" badge. 9 parts fit every engine; the other 9 are engine-specific.

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, FVP, PRESTONE, VALVOLINE and 1 other brand supply 4 parts: the catalog's value-priced group. A representative part number is FVP MV5050GAL.

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

The Premium section lists 5 options from PRESTONE and PEAK — a step above OE specification in materials, tolerances or warranty terms. PRESTONE AF6610 is listed in this group.

The Standard Replacement section lists 7 options from VALVOLINE, BECK/ARNLEY, AISIN and 2 other brands — 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

3 Coolant Hose / Pipe Seal parts for the 2021 Mazda CX-30 come from 2 brands — MAHLE / CLEVITE and AJUSA.

Listed part numbers: AJUSA 16564000, 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 2021 Mazda CX-30 come from TECHPRO.

Listed part numbers: 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 2021 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

8 Radiator parts are listed for the 2021 Mazda CX-30, from CSF, UAC, GPD and 3 other brands. CSF 3966 carries the "Popular" badge.

Economy: 2 parts, from GPD and TECHPRO. A representative part number is GPD 13931C.

The Standard Replacement section: 3 options from CSF, FVP and UAC. CSF 3966 is listed in this group.

3 ungrouped parts are not assigned to a grade, with the same engine-level match.

Part numbers include CSF 3966, GPD 13931C and TECHPRO MA3010251, among others listed above.

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

4 Radiator Cap parts are listed for the 2021 Mazda CX-30, from CALORSTAT and MOTORAD.

The Locking Replacement section lists 2 options from CALORSTAT and MOTORAD — grouped under the catalog's "Locking Replacement" designation — the notes column spells out what sets them apart. CALORSTAT RC0212 is listed in this group.

The Standard Replacement section: 1 option from MOTORAD. MOTORAD T16R is listed in this group.

1 ungrouped part is not assigned to a grade, with the same engine-level match.

Listed part numbers: CALORSTAT RC0212, MOTORAD ST16R and MOTORAD T16R, plus the other parts above.

This table covers the fan assemblies (and clutches, where listed) that pull air through the radiator. Read more

6 Radiator Fan Assembly parts for the 2021 Mazda CX-30 come from 5 brands — GPD, FOUR SEASONS, TYC and 2 other brands. The "Popular" part is FOUR SEASONS 76413. 3 parts fit every engine; the other 3 are engine-specific.

The Economy section: 2 options from GPD. GPD 2812469 is listed in this group.

Standard Replacement: 4 parts, from FOUR SEASONS, TYC, NISSENS and 1 other brand. A representative part number is FOUR SEASONS 76413.

This group includes FOUR SEASONS 76413, GPD 2812469 and GPD 2812032 and the remaining parts above.

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

9 Temperature Sender / Sensor parts are listed for the 2021 Mazda CX-30, from GPD, HOLSTEIN, DELPHI and 5 other brands. GPD 1712514 carries the "Popular" badge.

Economy: 2 parts, from GPD and HOLSTEIN. A representative part number is GPD 1712514.

The Standard Replacement section: 6 options from DELPHI, BECK/ARNLEY, FACET and 3 other brands. DELPHI TS10289 is listed in this group.

1 ungrouped part is not assigned to a grade, with the same engine-level match.

Part numbers include GPD 1712514, HOLSTEIN 2CTS0413 and DELPHI TS10289, among others listed above.

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

3 Thermostat parts for the 2021 Mazda CX-30 come from 3 brands — AISIN, CALORSTAT and FOUR SEASONS.

Listed part numbers: AISIN THZ008, CALORSTAT TH741888J and FOUR SEASONS 86366.

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 2021 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 housings and outlets the thermostat sits in. Read more

2 Thermostat Housing / Water Outlet parts for the 2021 Mazda CX-30 come from 2 brands — FOUR SEASONS and MOTORAD.

This group includes FOUR SEASONS 86338 and MOTORAD CH3098.

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

8 Water Pump parts for the 2021 Mazda CX-30 come from 5 brands — FVP, DAYCO, GMB and 2 other brands. The "Popular" part is DAYCO DP1899B.

The Economy section: 1 option from FVP. FVP US8205 is listed in this group.

Standard Replacement: 5 parts, from DAYCO, GATES, AISIN and 1 other brand. A representative part number is DAYCO DP1899B.

2 further parts sit outside the graded sections, with the same engine-level match.

Listed part numbers: DAYCO DP1899B, FVP US8205 and GATES 42205BH, plus the other parts 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

2 Water Pump Gasket parts are listed for the 2021 Mazda CX-30, from FEL-PRO and MAHLE / CLEVITE.

This group includes FEL-PRO 36188 and MAHLE / CLEVITE C33643.