2019 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 are listed for the 2019 Mazda 6, from PRESTONE, PEAK, VALVOLINE and 4 other brands. FVP MV5050GAL carries the "Popular" badge.

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

The Premium section lists 5 options from PRESTONE and PEAK — a step above OE specification in materials, tolerances or warranty terms. PRESTONE AF2100 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 2019 Mazda 6 come from 2 brands — MAHLE / CLEVITE and AJUSA.

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

3 Coolant Reservoir parts for the 2019 Mazda 6 come from 3 brands — DORMAN, GPD and TECHPRO.

Listed part numbers: DORMAN 603963, 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

This group shows a single part: CALORSTAT RC0204.

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

MOTORAD supplies both parts for the 2019 Mazda 6.

Part numbers include MOTORAD 3121 and MOTORAD 3122.

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

2 Intercooler parts are listed for the 2019 Mazda 6, from GPD and TECHPRO.

This group includes GPD 2711337 and TECHPRO MA3012100.

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 are listed for the 2019 Mazda 6, from CSF, TYC, AGILITY and 4 other brands. CSF 3804 carries the "Popular" badge.

Part numbers include CSF 3804, TYC 13367 and AGILITY 8013367, 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

5 Radiator Cap parts are listed for the 2019 Mazda 6, from CALORSTAT, MOTORAD and GATES. MOTORAD T16R carries the "Popular" badge.

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: 3 options from MOTORAD, CALORSTAT and GATES. MOTORAD T16R is listed in this group.

This group includes MOTORAD T16R, CALORSTAT RC0212 and MOTORAD ST16R and the remaining 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 2019 Mazda 6 come from 6 brands — GPD, FOUR SEASONS, TYC and 3 other brands. The "Popular" part is FOUR SEASONS 76339.

The Economy section: 1 option from GPD. GPD 2811889 is listed in this group.

Standard Replacement: 5 parts, from FOUR SEASONS, TYC, AGILITY and 2 other brands. A representative part number is FOUR SEASONS 76339.

Part numbers include FOUR SEASONS 76339, GPD 2811889 and TYC 623260, among others listed above.

This table covers the upper, lower and connecting hoses between radiator, engine and reservoir. Typical signs include swelling, cracks, a soft spot, or a leak at a clamp. Replace adjacent aged hoses while the system is drained — they share the same heat cycle. Read more

This group shows a single part: GATES 51874.

This table covers the Radiator Upper Air Baffle retainers and clips. Read more

This group shows a single part: DORMAN 963636.

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 are listed for the 2019 Mazda 6, 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.

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 for the 2019 Mazda 6 come from 5 brands — SKP, MOTORAD, AISIN and 2 other brands. The "Popular" part is MOTORAD TA9249.

The Economy section: 1 option from SKP. SKP SKTA9249 is listed in this group.

Standard Replacement: 4 parts, from MOTORAD, AISIN, CALORSTAT and 1 other brand. A representative part number is MOTORAD TA9249.

Listed part numbers: MOTORAD TA9249, SKP SKTA9249 and AISIN THZ008, 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

5 Thermostat / Thermostat Housing / Water Outlet Seal parts are listed for the 2019 Mazda 6, from MAHLE / CLEVITE and FEL-PRO. FEL-PRO 36216 carries the "Popular" badge.

Part numbers include FEL-PRO 36216, FEL-PRO 36184 and MAHLE / CLEVITE C33803, among others listed above.

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

3 Thermostat Housing / Water Outlet parts for the 2019 Mazda 6 come from 3 brands — FOUR SEASONS, GATES and MOTORAD.

Listed part numbers: FOUR SEASONS 86338, GATES CO35081 and 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

6 Water Pump parts for the 2019 Mazda 6 come from 5 brands — FVP, BECK/ARNLEY, GATES and 2 other brands. The "Popular" part is BECK/ARNLEY 1312543.

The Economy section: 2 options from BECK/ARNLEY and FVP. BECK/ARNLEY 1312543 is listed in this group.

Standard Replacement: 4 parts, from GATES, AISIN, FVP and 1 other brand. A representative part number is GATES 42205BH.

Part numbers include BECK/ARNLEY 1312543, FVP US8205 and GATES 42205BH, 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

3 Water Pump Gasket parts are listed for the 2019 Mazda 6, from BECK/ARNLEY, FEL-PRO and MAHLE / CLEVITE.

This group includes BECK/ARNLEY 0394193, FEL-PRO 36188 and MAHLE / CLEVITE C33643.