2021 Mazda 6 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 2021 Mazda 6 come from 7 brands — PRESTONE, PEAK, VALVOLINE and 4 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 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

One part is listed for the 2021 Mazda 6 — MAHLE / CLEVITE C33644.

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

2 Coolant Reservoir parts are listed for the 2021 Mazda 6, from GPD and TECHPRO.

Part numbers include GPD 2411253 and TECHPRO MA3014114.

This table covers the caps on the overflow / expansion tank. 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

One part is listed for the 2021 Mazda 6 — CALORSTAT RC0204.

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

2 Cooling System Tester Adapter parts for the 2021 Mazda 6 come from MOTORAD.

This group includes MOTORAD 3121 and MOTORAD 3122.

This table covers the intercoolers that cool turbo or supercharger charge air. Read more

4 Intercooler parts for the 2021 Mazda 6 come from 4 brands — GPD, NISSENS, TECHPRO and 1 other brand.

Part numbers include GPD 2711337, NISSENS 961545 and TECHPRO MA3012100, among others listed above.

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

One part is listed for the 2021 Mazda 6 — 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

4 Radiator parts for the 2021 Mazda 6 come from 4 brands — GPD, TECHPRO, AGILITY and 1 other brand.

The Economy section: 2 options from GPD and TECHPRO. GPD 13822C is listed in this group.

Standard Replacement: 2 parts, from AGILITY and CSF. A representative part number is AGILITY 8013822.

This group includes GPD 13822C, TECHPRO MA3010248 and AGILITY 8013822 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

5 Radiator Cap parts for the 2021 Mazda 6 come from 3 brands — CALORSTAT, MOTORAD and GATES. The "Popular" part is MOTORAD T16R.

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: 3 parts, from MOTORAD, CALORSTAT and GATES. A representative part number is MOTORAD T16R.

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