2020 Mazda 3 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

17 Coolant / Antifreeze parts for the 2020 Mazda 3 come from 7 brands — PRESTONE, PEAK, VALVOLINE and 4 other brands. The "Popular" part is FVP MV5050GAL. 14 parts fit every engine; the other 3 are engine-specific.

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 4 options from FVP, PRESTONE, PEAK and 1 other brand — the catalog's value-priced group. FVP MV5050GAL is listed in this group.

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, BECK/ARNLEY, AISIN and 2 other brands supply 7 parts: built to original-equipment specification. A representative part number is VALVOLINE 861398.

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 are listed for the 2020 Mazda 3, from MAHLE / CLEVITE and AJUSA. 1 part fits every engine; the other 2 are engine-specific.

This group includes AJUSA 16564000, MAHLE / CLEVITE C33805 and MAHLE / CLEVITE C33644.

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

TECHPRO supplies both parts for the 2020 Mazda 3. All of them fit every engine offered in the 2020 3.

Part numbers include TECHPRO MA3014119 and TECHPRO MA3014121.

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

This group shows a single part: MOTORAD 3121.

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

7 Radiator parts for the 2020 Mazda 3 come from 6 brands — UAC, GPD, TECHPRO and 3 other brands. The "Popular" part is CSF 3966. 3 parts fit every engine; the other 4 are engine-specific.

The Economy section: 2 options from GPD and TECHPRO. GPD 13868C is listed in this group.

Standard Replacement: 5 parts, from UAC, CSF, KOYORAD and 1 other brand. A representative part number is CSF 3966.

This group includes CSF 3966, GPD 13868C and TECHPRO MA3010250 and the remaining parts 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 for the 2020 Mazda 3 come from 2 brands — CALORSTAT and MOTORAD.

In the Locking Replacement grade, CALORSTAT 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 CALORSTAT RC0212.

Standard Replacement: 1 part, from MOTORAD. A representative part number is MOTORAD T16R.

1 further part sits outside the graded sections, with the same engine-level match.

Part numbers include CALORSTAT RC0212, MOTORAD ST16R and MOTORAD T16R, among others listed above.

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

7 Radiator Fan Assembly parts are listed for the 2020 Mazda 3, from UAC, GPD, TECHPRO and 3 other brands. FOUR SEASONS 76413 carries the "Popular" badge. All of them fit every engine offered in the 2020 3.

Economy: 2 parts, from GPD and TECHPRO. A representative part number is GPD 2812469.

The Standard Replacement section: 5 options from UAC, FOUR SEASONS, TYC and 1 other brand. FOUR SEASONS 76413 is listed in this group.

Part numbers include FOUR SEASONS 76413, GPD 2812469 and TECHPRO MA3115170, among others listed 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

8 Temperature Sender / Sensor parts for the 2020 Mazda 3 come from 8 brands — GPD, HOLSTEIN, DELPHI and 5 other brands. The "Popular" part is GPD 1712514. 2 parts fit every engine; the other 6 are engine-specific.

The Economy section: 2 options from GPD and HOLSTEIN. GPD 1712514 is listed in this group.

Standard Replacement: 6 parts, from DELPHI, BECK/ARNLEY, FACET and 3 other brands. A representative part number is DELPHI TS10289.

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

5 Thermostat parts are listed for the 2020 Mazda 3, from FOUR SEASONS, MOTORAD and SKP.

Economy: 1 part, from SKP. A representative part number is SKP SKTA9249.

The Standard Replacement section: 2 options from FOUR SEASONS and MOTORAD. FOUR SEASONS 86366 is listed in this group.

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

Listed part numbers: SKP SKTA9249, FOUR SEASONS 86366 and MOTORAD TA9249, plus the other parts above.

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

3 Thermostat / Thermostat Housing / Water Outlet Seal parts for the 2020 Mazda 3 come from MAHLE / CLEVITE.

Part numbers include MAHLE / CLEVITE C33803, MAHLE / CLEVITE C33774 and MAHLE / CLEVITE C33804.

This table covers the housings and outlets the thermostat sits in. Read more

One part is listed for the 2020 Mazda 3 — MOTORAD CH3147.

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

9 Water Pump parts are listed for the 2020 Mazda 3, from FVP, AISIN, GMB and 2 other brands. BECK/ARNLEY 1312543 carries the "Popular" badge.

Economy: 2 parts, from BECK/ARNLEY and FVP. A representative part number is BECK/ARNLEY 1312543.

The Standard Replacement section: 4 options from GATES, AISIN, FVP and 1 other brand. GATES 42205BH is listed in this group.

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

This group includes BECK/ARNLEY 1312543, FVP US8205 and GATES 42205BH and the remaining 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

3 Water Pump Gasket parts for the 2020 Mazda 3 come from 3 brands — BECK/ARNLEY, FEL-PRO and MAHLE / CLEVITE.

Listed part numbers: BECK/ARNLEY 0394193, FEL-PRO 36188 and MAHLE / CLEVITE C33643.