2025 BMW Z4 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

VALVOLINE supplies both parts for the 2025 BMW Z4. All of them fit every engine offered in the 2025 Z4.

In the Economy grade, VALVOLINE supplies 1 part: the catalog's value-priced group. A representative part number is VALVOLINE 719009.

The Standard Replacement section lists 1 option from VALVOLINE — built to original-equipment specification. VALVOLINE 904685 is listed in this group.

Listed part numbers: VALVOLINE 719009 and VALVOLINE 904685.

This table covers the bleeders used to purge air from the coolant circuit. Read more

2 Coolant Air Bleeder parts for the 2025 BMW Z4 come from DORMAN.

Part numbers include DORMAN 902404 and DORMAN 902404HP.

This table covers the Coolant Hose Flange plugs. Typical signs include a leak at the drain or glow-plug hole, or a plug that has rounded off. Replace the crush washer and torque to the spec in the notes. Read more

One part is listed for the 2025 BMW Z4 — REIN CHM0562.

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

6 Coolant Reservoir parts for the 2025 BMW Z4 come from 3 brands — TECHPRO, MAHLE / CLEVITE and REIN. The "Popular" part is TECHPRO BM3014119. Every part fits both the 2.0L L4 Turbocharged and the 3.0L L6 Turbocharged.

Listed part numbers: TECHPRO BM3014119, TECHPRO BM3014121 and MAHLE / CLEVITE CRT299000S, plus the other parts above.

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

3 Coolant Reservoir Cap parts for the 2025 BMW Z4 come from 3 brands — CALORSTAT, MOTORAD and REIN. 2 parts fit every engine; the other 1 is engine-specific.

This group includes CALORSTAT RC0084, MOTORAD T76 and REIN CPE0078.

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

6 Radiator parts are listed for the 2025 BMW Z4, from GPD, NISSENS, TECHPRO and 1 other brand. NISSENS 606784 carries the "Popular" badge. 3 parts fit every engine; the other 3 are engine-specific.

Economy: 3 parts, from GPD and TECHPRO. A representative part number is GPD 13799C.

The Standard Replacement section: 3 options from NISSENS and AGILITY. NISSENS 606784 is listed in this group.

Part numbers include NISSENS 606784, GPD 13799C and GPD 13873C, 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

3 Temperature Sender / Sensor parts are listed for the 2025 BMW Z4, from NISSENS, STANDARD MOTOR PRODUCTS and VNE. 2 parts fit every engine; the other 1 is engine-specific.

Part numbers include NISSENS 207110, STANDARD MOTOR PRODUCTS TX332 and VNE 941041.

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

4 Thermostat parts for the 2025 BMW Z4 come from 3 brands — MOTORAD, SKP and FOUR SEASONS.

The Economy section: 1 option from SKP. SKP SK1120221 is listed in this group.

Standard Replacement: 1 part, from MOTORAD. A representative part number is MOTORAD 1120221.

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

Part numbers include SKP SK1120221, MOTORAD 1120221 and FOUR SEASONS 86364, among others listed above.

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 2025 BMW Z4 come from 4 brands — FVP, ÜRO PARTS, GMB and 1 other brand.

The Economy section: 1 option from ÜRO PARTS. ÜRO PARTS 11518482251 is listed in this group.

Standard Replacement: 1 part, from FVP. A representative part number is FVP 1153370.

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

Listed part numbers: ÜRO PARTS 11518482251, FVP 1153370 and FVP 1153360, 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

One part is listed for the 2025 BMW Z4 — AJUSA 01732500.