2021 BMW I3S 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

11 Coolant / Antifreeze parts for the 2021 BMW I3S come from 4 brands — PRESTONE, PEAK, AISIN and 1 other brand. The "Popular" part is PRESTONE AF3100. Every part fits both the 647cc L2 ELECTRIC and the 647cc L2 ELECTRIC/GAS.

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

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, PEAK and VALVOLINE supply 3 parts: built to original-equipment specification. A representative part number is AISIN ACE008.

This table covers the hard pipes and extra hoses in the coolant circuit. Read more

This group shows a single part: MOTORAD CH2765.

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

One part is listed for the 2021 BMW I3S — REIN EPT0014.

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 are listed for the 2021 BMW I3S, from CALORSTAT, MOTORAD and REIN. 2 parts fit every engine; the other 1 is engine-specific.

Part numbers include 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 for the 2021 BMW I3S come from 5 brands — NISSENS, TYC, DENSO and 2 other brands. The "Popular" part is TYC 13600. 1 part fits every engine; the other 5 are engine-specific.

This group includes TYC 13600, DENSO 2219491 and MAHLE / CLEVITE CR824000P and the remaining parts 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

5 Temperature Sender / Sensor parts for the 2021 BMW I3S come from 5 brands — GPD, HOLSTEIN, WALKER PRODUCTS and 2 other brands. The "Popular" part is WALKER PRODUCTS 2112021.

The Economy section: 2 options from GPD and HOLSTEIN. GPD 1814545 is listed in this group.

Standard Replacement: 2 parts, from WALKER PRODUCTS and FACET. A representative part number is WALKER PRODUCTS 2112021.

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

Part numbers include WALKER PRODUCTS 2112021, GPD 1814545 and HOLSTEIN 2CTS0198, 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

One part is listed for the 2021 BMW I3S — MOTORAD 1042185.

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

2 Water Pump parts are listed for the 2021 BMW I3S, from BOSCH and NISSENS. All of them fit every engine offered in the 2021 I3S.

Part numbers include BOSCH 0392023509 and NISSENS 832126.