2021 BMW 540I 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 540I, from PRESTONE, PEAK, VALVOLINE and 1 other brand. PRESTONE AF3100 carries the "Popular" badge.

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 540I come from DORMAN.

Part numbers include DORMAN 902404 and DORMAN 902404HP.

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

5 Coolant Reservoir parts for the 2021 BMW 540I come from 3 brands — REIN, ÜRO PARTS and MAHLE / CLEVITE. The "Popular" part is ÜRO PARTS 17138610656.

This group includes ÜRO PARTS 17138610656, MAHLE / CLEVITE CRT239000S and REIN EPT0263 and the remaining 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

5 Coolant Reservoir Cap parts for the 2021 BMW 540I come from 3 brands — REIN, CALORSTAT and MOTORAD. The "Popular" part is REIN CPE0035.

Listed part numbers: REIN CPE0035, CALORSTAT RC0084 and CALORSTAT RC0083, 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

6 Radiator parts are listed for the 2021 BMW 540I, from MAHLE / CLEVITE, NISSENS and GPD. GPD 13800C carries the "Popular" badge.

Economy: 1 part, from GPD. A representative part number is GPD 13800C.

The Standard Replacement section: 5 options from MAHLE / CLEVITE and NISSENS. MAHLE / CLEVITE CR2307000P is listed in this group.

This group includes GPD 13800C, MAHLE / CLEVITE CR2307000P and MAHLE / CLEVITE CR2215000P and the remaining parts above.

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

4 Radiator Fan Assembly parts for the 2021 BMW 540I come from 3 brands — TECHPRO, MAHLE / CLEVITE and VDO / CONTINENTAL.

The Economy section: 2 options from TECHPRO. TECHPRO BM3115140 is listed in this group.

Standard Replacement: 2 parts, from MAHLE / CLEVITE and VDO / CONTINENTAL. A representative part number is MAHLE / CLEVITE CFF549000P.

This group includes TECHPRO BM3115140, TECHPRO BM3115143 and MAHLE / CLEVITE CFF549000P 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

8 Temperature Sender / Sensor parts are listed for the 2021 BMW 540I, from GPD, WALKER PRODUCTS, VEMO and 3 other brands. GPD 1814545 carries the "Popular" badge.

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.

Part numbers include GPD 1814545, GPD 1814574 and VEMO V20720201, 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

3 Thermostat parts for the 2021 BMW 540I come from 3 brands — SKP, MOTORAD and INA.

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.

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

Part numbers include SKP SK1120221, MOTORAD 1120221 and INA XW0811.

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 2021 BMW 540I come from 5 brands — BOSCH, FVP, GMB and 2 other brands. The "Popular" part is BOSCH 0392023486.

Listed part numbers: BOSCH 0392023486, BOSCH 0392023509 and FVP 1153380, 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 2021 BMW 540I — AJUSA 01732500.