2025 Mazda CX-50 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-50, from PRESTONE, VALVOLINE and PENTOSIN. PRESTONE AF2100 carries the "Popular" badge. 9 parts fit every engine; the other 1 is 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, 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

This group shows a single part: MAHLE / CLEVITE C33644.

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

One part is listed for the 2025 Mazda CX-50 — 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

One part is listed for the 2025 Mazda CX-50 — FVP RAD14041.

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-50. All of them fit every engine offered in the 2025 CX-50.

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

5 Temperature Sender / Sensor parts are listed for the 2025 Mazda CX-50, from HOLSTEIN, NISSENS, WELLS and 1 other brand.

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.

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

Listed part numbers: HOLSTEIN 2CTS0413, NISSENS 207098 and WELLS 5S12433, plus the other parts 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

2 Thermostat parts for the 2025 Mazda CX-50 come from 2 brands — FOUR SEASONS and MOTORAD.

Part numbers include FOUR SEASONS 14646 and MOTORAD 1464169.

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 are listed for the 2025 Mazda CX-50, from MAHLE / CLEVITE and FEL-PRO. 2 parts fit every engine; the other 1 is engine-specific.

Part numbers include FEL-PRO 36216, MAHLE / CLEVITE C33803 and MAHLE / CLEVITE C33774.

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

2 Thermostat Housing / Water Outlet parts for the 2025 Mazda CX-50 come from 2 brands — FOUR SEASONS and MOTORAD. 1 part fits every engine; the other 1 is engine-specific.

This group includes FOUR SEASONS 86029 and MOTORAD CH6129.

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

4 Water Pump parts for the 2025 Mazda CX-50 come from 4 brands — AISIN, FVP, GATES and 1 other brand. 3 parts fit every engine; the other 1 is engine-specific.

Listed part numbers: AISIN WPZ045, FVP 1452580 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 2025 Mazda CX-50, from FEL-PRO and MAHLE / CLEVITE.

Part numbers include FEL-PRO 36188 and MAHLE / CLEVITE C33643.