2021 BMW I3 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 are listed for the 2021 BMW I3, from PRESTONE, PEAK, AISIN and 1 other brand. PRESTONE AF3100 carries the "Popular" badge. All of them fit every engine offered in the 2021 I3.

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 PEAK supply 2 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 hard pipes and extra hoses in the coolant circuit. Read more

One part is listed for the 2021 BMW I3 — MOTORAD CH2765.

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

This group shows a single part: 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 for the 2021 BMW I3 come from 3 brands — 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

11 Radiator parts are listed for the 2021 BMW I3, from UAC, NISSENS, TECHPRO and 6 other brands. TYC 13600 carries the "Popular" badge.

Economy: 1 part, from TECHPRO. A representative part number is TECHPRO BM3010182.

The Standard Replacement section: 5 options from TYC, UAC, MAHLE / CLEVITE and 2 other brands. TYC 13600 is listed in this group.

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

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

This group shows a single part: TECHPRO BM3115134.

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

4 Temperature Sender / Sensor parts are listed for the 2021 BMW I3, from GPD, FACET, WALKER PRODUCTS and 1 other brand.

Economy: 1 part, from GPD. A representative part number is GPD 1814545.

The Standard Replacement section: 2 options from FACET and WALKER PRODUCTS. FACET 73405 is listed in this group.

1 ungrouped part is not assigned to a grade, with the same engine-level match.

Part numbers include GPD 1814545, FACET 73405 and WALKER PRODUCTS 2112021, 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

This group shows a single part: 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 for the 2021 BMW I3 come from 2 brands — BOSCH and NISSENS. Every part fits both the 647cc L2 ELECTRIC and the 647cc L2 ELECTRIC/GAS.

Part numbers include BOSCH 0392023509 and NISSENS 832126.

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 2021 BMW I3 — ELRING 773790.