2021 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

12 Coolant / Antifreeze parts are listed for the 2021 BMW Z4, from PRESTONE, PEAK, VALVOLINE and 1 other brand. PRESTONE AF3100 carries the "Popular" badge. All of them fit every engine offered in the 2021 Z4.

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, VALVOLINE and PEAK supply 3 parts: the catalog's value-priced group. A representative part number is PRESTONE AF3100.

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 3 options from AISIN, PEAK and VALVOLINE — built to original-equipment specification. AISIN ACE008 is listed in this group.

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

2 Coolant Air Bleeder parts for the 2021 BMW Z4 come from DORMAN. Every part fits both the 2.0L L4 Turbocharged and the 3.0L L6 Turbocharged.

Listed part numbers: DORMAN 902404 and DORMAN 902404HP.

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: ELRING 283410.

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 2021 BMW Z4 — REIN CHM0562.

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

5 Coolant Reservoir parts for the 2021 BMW Z4 come from 2 brands — TECHPRO and MAHLE / CLEVITE. The "Popular" part is TECHPRO BM3014121. Every part fits both the 2.0L L4 Turbocharged and the 3.0L L6 Turbocharged.

Listed part numbers: TECHPRO BM3014121, MAHLE / CLEVITE CRT299000S and MAHLE / CLEVITE CRT254000S, 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

4 Coolant Reservoir Cap parts for the 2021 BMW Z4 come from 4 brands — CALORSTAT, MOTORAD, REIN and 1 other brand. 3 parts fit every engine; the other 1 is engine-specific.

Listed part numbers: CALORSTAT RC0084, MOTORAD T76 and REIN CPE0078, plus the other parts above.

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

9 Radiator parts are listed for the 2021 BMW Z4, from NISSENS, UAC, ULTRA-POWER and 3 other brands. ULTRA-POWER 13799 carries the "Popular" badge. 5 parts fit every engine; the other 4 are engine-specific.

Economy: 2 parts, from ULTRA-POWER and GPD. A representative part number is ULTRA-POWER 13799.

The Standard Replacement section: 7 options from NISSENS, UAC, AGILITY and 1 other brand. NISSENS 606783 is listed in this group.

Part numbers include ULTRA-POWER 13799, GPD 13799C and NISSENS 606783, 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 are listed for the 2021 BMW Z4, from GPD, WALKER PRODUCTS, VEMO and 3 other brands. GPD 1814545 carries the "Popular" badge. All of them fit every engine offered in the 2021 Z4.

Economy: 3 parts, from GPD and VEMO. A representative part number is GPD 1814545.

The Standard Replacement section: 5 options from WALKER PRODUCTS, FACET, STANDARD MOTOR PRODUCTS and 1 other brand. WALKER PRODUCTS 2112021 is listed in this group.

Listed part numbers: GPD 1814545, GPD 1814574 and VEMO V20720201, 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

6 Thermostat parts for the 2021 BMW Z4 come from 4 brands — SKP, MOTORAD, FOUR SEASONS and 1 other brand.

The Economy section: 2 options from SKP. SKP SKTA9251 is listed in this group.

Standard Replacement: 3 parts, from MOTORAD and FOUR SEASONS. A representative part number is FOUR SEASONS 86364.

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

Part numbers include SKP SKTA9251, SKP SK1120221 and FOUR SEASONS 86364, among others listed above.

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

This group shows a single part: VEMO V20990005.

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

14 Water Pump parts for the 2021 BMW Z4 come from 8 brands — FVP, GRAF, GATES and 5 other brands. The "Popular" part is GATES 41244.

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

Standard Replacement: 5 parts, from GATES, SALERI, BOSCH and 2 other brands. A representative part number is GATES 41244.

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

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 2021 BMW Z4, from AJUSA and ELRING.

Listed part numbers: AJUSA 01732500 and ELRING 113600.