2021 BMW X3 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

14 Coolant / Antifreeze parts for the 2021 BMW X3 come from 5 brands — PRESTONE, PEAK, VALVOLINE and 2 other brands. The "Popular" part is PRESTONE AF3100. 12 parts fit every engine; the other 2 are engine-specific.

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 3 options from PRESTONE, VALVOLINE and PEAK — the catalog's value-priced group. PRESTONE AF3100 is listed in this group.

In the Heavy Duty grade, PRESTONE supplies 1 part: rated for severe service. A representative part number is PRESTONE AFC12100.

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, AISIN, BECK/ARNLEY, PEAK and 1 other brand supply 4 parts: built to original-equipment specification. A representative part number is AISIN ACE008.

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

ELRING supplies both parts for the 2021 BMW X3. 1 part fits every engine; the other 1 is engine-specific.

This group includes ELRING 283410 and ELRING 521520.

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

9 Coolant Reservoir parts are listed for the 2021 BMW X3, from REIN, MAHLE / CLEVITE, TECHPRO and 1 other brand. REIN EPT0262 carries the "Popular" badge. 7 parts fit every engine; the other 2 are engine-specific.

Part numbers include REIN EPT0262, ÜRO PARTS 17138742660K and MAHLE / CLEVITE CRT302000S, among others listed 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

6 Coolant Reservoir Cap parts are listed for the 2021 BMW X3, from MOTORAD, CALORSTAT and REIN. MOTORAD T64 carries the "Popular" badge. 4 parts fit every engine; the other 2 are engine-specific.

Part numbers include MOTORAD T64, CALORSTAT RC0083 and CALORSTAT RC0084, among others listed 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

10 Radiator parts for the 2021 BMW X3 come from 6 brands — CSF, KOYORAD, FVP and 3 other brands. The "Popular" part is KOYORAD A13910. 4 parts fit every engine; the other 6 are engine-specific.

The Economy section: 1 option from GPD. GPD 13910C is listed in this group.

Standard Replacement: 9 parts, from CSF, KOYORAD, FVP and 2 other brands. A representative part number is KOYORAD A13910.

This table covers the fan assemblies (and clutches, where listed) that pull air through the radiator. Read more

8 Radiator Fan Assembly parts are listed for the 2021 BMW X3, from TECHPRO, GPD, FOUR SEASONS and 2 other brands. FOUR SEASONS 75319 carries the "Popular" badge.

Economy: 5 parts, from TECHPRO and GPD. A representative part number is GPD 2812279.

The Standard Replacement section: 3 options from FOUR SEASONS, UAC and VDO / CONTINENTAL. FOUR SEASONS 75319 is listed in this group.

Part numbers include FOUR SEASONS 75319, GPD 2812279 and TECHPRO BM3115136, 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

9 Temperature Sender / Sensor parts for the 2021 BMW X3 come from 6 brands — GPD, STANDARD MOTOR PRODUCTS, WALKER PRODUCTS and 3 other brands. The "Popular" part is STANDARD MOTOR PRODUCTS TS658. Every part fits all 3 engine options (2.0L L4 ELECTRIC/GAS Turbocharged, 2.0L L4 Turbocharged and 3.0L L6 Turbocharged).

The Economy section: 3 options from GPD and VEMO. GPD 1814545 is listed in this group.

Standard Replacement: 6 parts, from STANDARD MOTOR PRODUCTS, WALKER PRODUCTS, FACET and 1 other brand. A representative part number is STANDARD MOTOR PRODUCTS TS658.

This group includes STANDARD MOTOR PRODUCTS TS658, GPD 1814545 and GPD 1814574 and the remaining 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

13 Thermostat parts are listed for the 2021 BMW X3, from MOTORAD, FOUR SEASONS, SKP and 5 other brands. BECK/ARNLEY 1430869 carries the "Popular" badge.

Economy: 3 parts, from SKP and ÜRO PARTS. A representative part number is SKP SKTA9251.

The Standard Replacement section: 7 options from MOTORAD, FOUR SEASONS, BECK/ARNLEY and 2 other brands. BECK/ARNLEY 1430869 is listed in this group.

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

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 for the 2021 BMW X3 come from 3 brands — ELRING, FEL-PRO and MAHLE / CLEVITE.

Part numbers include ELRING 082150, FEL-PRO 36226 and MAHLE / CLEVITE C32504.

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

VEMO supplies both parts for the 2021 BMW X3.

Part numbers include VEMO V20991310 and 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

13 Water Pump parts are listed for the 2021 BMW X3, from BOSCH, FVP, GRAF and 4 other brands. BOSCH 0392023509 carries the "Popular" badge.

Economy: 1 part, from ÜRO PARTS. A representative part number is ÜRO PARTS 11518482251.

The Standard Replacement section: 3 options from BOSCH, FVP and GRAF. BOSCH 0392023486 is listed in this group.

9 ungrouped parts are not assigned to a grade, 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

5 Water Pump Gasket parts for the 2021 BMW X3 come from 2 brands — ELRING and AJUSA.

This group includes AJUSA 77080300, AJUSA 01732500 and ELRING 078580 and the remaining parts above.