56 Cooling system parts are listed for the 2021 BMW 840I, in 12 part types, covering the 3.0L L6 Turbocharged engine. Each one has a brand, a manufacturer part number and notes that say where it fits.
The cooling system system on the 2021 BMW 840I keeps operating temperature in the narrow band the engine was designed for, from radiator and water pump to thermostat and hoses. The largest groups are Coolant / Antifreeze (12 parts), Temperature Sender / Sensor (8 parts) and Water Pump (8 parts). The other 9 part types cover the remaining 28 parts.
Every part on this page is matched to the 3.0L L6 Turbocharged — the only engine offered in the 2021 BMW 840I.
The most listed brands for 2021 BMW 840I cooling system parts are REIN (6 parts), MAHLE / CLEVITE (6 parts) and PRESTONE (5 parts), plus 22 more brands. Quality grades include Standard Replacement, Economy and Premium.
11 parts on this 2021 BMW 840I page carry a "Popular" badge — the source catalog's flag for options frequently chosen for this vehicle — including PRESTONE AF3100 (Coolant / Antifreeze) and REIN EPK0242 (Coolant Reservoir). Click any part number to see every vehicle that part fits.
Coolant / Antifreeze
Compatible With All Colors
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| PRESTONE | AF3055 | 🇺🇸 US | Prime YellowAll Vehicles | View on Amazon |
Economy
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| PRESTONE Popular | AF3100 | 🇺🇸 US | Prime Yellow - All VehiclesExtended Life | View on Amazon |
| VALVOLINE Popular | 719009 | 🇺🇸 US | Multi-Vehicle Yellow1 Gallon | View on Amazon |
| PEAK | BQA1GAL | 🇺🇸 US | Blue Mountain Long LifeAll Vehicle | View on Amazon |
Premium
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| PRESTONE Popular | AF2100 | 🇺🇸 US | All Vehicles10yr/300k mi | View on Amazon |
| PEAK | PKP1GAL | 🇺🇸 US | All Vehicles Antifreeze1 Gallon | View on Amazon |
| PEAK | PXA1GAL | 🇺🇸 US | 1 GallonGlobal Lifetime | View on Amazon |
| PRESTONE | AF6110 | 🇺🇸 US | MAX Original EquipmentEuropean Blue | View on Amazon |
| PRESTONE | AFMAX | 🇺🇸 US | Max Universal1 Gallon | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| AISIN | ACE008 | 🇺🇸 US | BlueHOAT | View on Amazon |
| PEAK | PEB1GAL | 🇺🇸 US | OET European Extended Life Blue1 Gallon | View on Amazon |
| VALVOLINE | 904685 | 🇺🇸 US | HT-12 Green1 Gallon | View on Amazon |
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.
12 Coolant / Antifreeze parts for the 2021 BMW 840I come from 4 brands — PRESTONE, PEAK, VALVOLINE and 1 other brand. The "Popular" part is PRESTONE AF3100.
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 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.
Coolant Air Bleeder
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| DORMAN | 902404 | 🇺🇸 US | Plastic | View on Amazon |
| DORMAN | 902404HP | 🇺🇸 US | OE FIX | View on Amazon |
This table covers the bleeders used to purge air from the coolant circuit.
DORMAN supplies both parts for the 2021 BMW 840I.
Listed part numbers: DORMAN 902404 and DORMAN 902404HP.
Coolant Reservoir
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| REIN Popular | EPK0242 | 🇺🇸 US | Includes OE cap and fluid level sensor | View on Amazon |
| ÜRO PARTS Popular | 17138610656 | 🇺🇸 US | View on Amazon | |
| GPD | 2411317 | 🇺🇸 US | View on Amazon | |
| MAHLE / CLEVITE | CRT239000S | 🇺🇸 US | Plastic | View on Amazon |
| MAHLE / CLEVITE | CRT240000S | 🇺🇸 US | with Coolant Level Sensor | View on Amazon |
| REIN | EPT0263 | 🇺🇸 US | Intercoolerwithout Cap | View on Amazon |
| REIN | EPT0242 | 🇺🇸 US | Radiatorwithout Cap | View on Amazon |
This table covers the overflow / expansion tanks that hold extra coolant.
7 Coolant Reservoir parts are listed for the 2021 BMW 840I, from REIN, MAHLE / CLEVITE, ÜRO PARTS and 1 other brand. REIN EPK0242 carries the "Popular" badge.
Listed part numbers: REIN EPK0242, ÜRO PARTS 17138610656 and GPD 2411317, plus the other parts above.
Coolant Reservoir Cap
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| REIN Popular | CPE0035 | 🇺🇸 US | RADIATOR | View on Amazon |
| CALORSTAT | RC0084 | 🇺🇸 US | Auxiliary840i Base Model or 840i xDrive Base Model | View on Amazon |
| CALORSTAT | RC0083 | 🇺🇸 US | Maximum Pressure Rating: 20.0 PS | View on Amazon |
| MOTORAD | T76 | 🇺🇸 US | Standard | View on Amazon |
| REIN | CPE0078 | 🇺🇸 US | Intercooler | View on Amazon |
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.
5 Coolant Reservoir Cap parts are listed for the 2021 BMW 840I, from REIN, CALORSTAT and MOTORAD. REIN CPE0035 carries the "Popular" badge.
This group includes REIN CPE0035, CALORSTAT RC0084 and CALORSTAT RC0083 and the remaining parts above.
Radiator
Economy
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| GPD Popular | 13800C | 🇺🇸 US | PRIMARY | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| MAHLE / CLEVITE | CR2307000P | 🇺🇸 US | Brazed cooling fins | View on Amazon |
| MAHLE / CLEVITE | CR2215000P | 🇺🇸 US | Brazed cooling fins | View on Amazon |
| MAHLE / CLEVITE | CR2799000P | 🇺🇸 US | Brazed cooling fins | View on Amazon |
| NISSENS | 606233 | 🇺🇸 US | Auxiliary (Location-Wheel Arch) | View on Amazon |
| NISSENS | 60867 | 🇺🇸 US | Aluminum Core / Aluminum Tank | View on Amazon |
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.
6 Radiator parts for the 2021 BMW 840I come from 3 brands — MAHLE / CLEVITE, NISSENS and GPD. The "Popular" part is GPD 13800C.
The Economy section: 1 option from GPD. GPD 13800C is listed in this group.
Standard Replacement: 5 parts, from MAHLE / CLEVITE and NISSENS. A representative part number is MAHLE / CLEVITE CR2307000P.
This group includes GPD 13800C, MAHLE / CLEVITE CR2307000P and MAHLE / CLEVITE CR2215000P and the remaining parts above.
Radiator Fan Assembly
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| MAHLE / CLEVITE | CFF549000P | 🇺🇸 US | View on Amazon | |
| VDO / CONTINENTAL | FA74020 | 🇺🇸 US | Airflow Rate: 5381.684 | View on Amazon |
This table covers the fan assemblies (and clutches, where listed) that pull air through the radiator.
2 Radiator Fan Assembly parts are listed for the 2021 BMW 840I, from MAHLE / CLEVITE and VDO / CONTINENTAL.
This group includes MAHLE / CLEVITE CFF549000P and VDO / CONTINENTAL FA74020.
Radiator Hose
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| REIN | CHR1020 | 🇺🇸 US | Material: Ethylene Propylene Terpolymer (EPDM) | View on Amazon |
This table covers the upper, lower and connecting hoses between radiator, engine and reservoir. Typical signs include swelling, cracks, a soft spot, or a leak at a clamp. Replace adjacent aged hoses while the system is drained — they share the same heat cycle.
One part is listed for the 2021 BMW 840I — REIN CHR1020.
Temperature Sender / Sensor
Economy
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| GPD Popular | 1814545 | 🇺🇸 US | Engine Block | View on Amazon |
| GPD | 1814574 | 🇺🇸 US | RADIATOR | View on Amazon |
| VEMO | V20720201 | 🇺🇸 US | Position: Radiator | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| WALKER PRODUCTS Popular | 2112021 | 🇺🇸 US | Sensor Only | View on Amazon |
| FACET | 73405 | 🇺🇸 US | Location-Cylinder Head | View on Amazon |
| STANDARD MOTOR PRODUCTS | TX332 | 🇺🇸 US | 840i Base Model or 840i xDrive Base Model | View on Amazon |
| WALKER PRODUCTS | 2112104 | 🇺🇸 US | Sensor Only | View on Amazon |
| WELLS | 5S15283 | 🇺🇸 US | 840i Base Model or 840i xDrive Base ModelLocated on Cylinder Head | View on Amazon |
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.
8 Temperature Sender / Sensor parts for the 2021 BMW 840I come from 6 brands — GPD, WALKER PRODUCTS, VEMO and 3 other brands. The "Popular" part is GPD 1814545.
The Economy section: 3 options from GPD and VEMO. GPD 1814545 is listed in this group.
Standard Replacement: 5 parts, from WALKER PRODUCTS, FACET, STANDARD MOTOR PRODUCTS and 1 other brand. A representative part number is WALKER PRODUCTS 2112021.
Part numbers include GPD 1814545, GPD 1814574 and VEMO V20720201, among others listed above.
Thermostat
Economy
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| SKP | SK1120221 | 🇺🇸 US | Includes Thermostat, Housing, Sensor, and Seal | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| MOTORAD | 1120221 | 🇺🇸 US | Includes Housing, Sensor, Seal | View on Amazon |
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| INA | XW0811 | 🇺🇸 US | Includes Thermostat, Housing, Sensor, and SealIntegrated Housing Thermostat | View on Amazon |
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.
3 Thermostat parts are listed for the 2021 BMW 840I, from SKP, MOTORAD and INA.
Economy: 1 part, from SKP. A representative part number is SKP SK1120221.
The Standard Replacement section: 1 option from MOTORAD. MOTORAD 1120221 is listed in this group.
1 ungrouped part is not assigned to a grade, with the same engine-level match.
Part numbers include SKP SK1120221, MOTORAD 1120221 and INA XW0811.
Thermostat Housing / Water Outlet
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| VEMO | V20990005 | 🇺🇸 US | Thermostat Housing | View on Amazon |
This table covers the housings and outlets the thermostat sits in.
One part is listed for the 2021 BMW 840I — VEMO V20990005.
Water Pump
Economy
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| ÜRO PARTS | 11518482251 | 🇺🇸 US | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| BOSCH Popular | 0392023509 | 🇺🇸 US | Auxiliary Water Pump | View on Amazon |
| GATES Popular | 41244 | 🇺🇸 US | without Housing | View on Amazon |
| BOSCH | 0392023486 | 🇺🇸 US | Auxiliary Water Pump | View on Amazon |
| BOSCH | 039202411V | 🇺🇸 US | Auxiliary Water Pump | View on Amazon |
| FVP | 1153370 | 🇺🇸 US | View on Amazon | |
| GRAF | AWP061 | 🇺🇸 US | Electric Pump | View on Amazon |
| NISSENS | 832128 | 🇺🇸 US | HVAC SystemAuxiliary | View on Amazon |
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.
8 Water Pump parts are listed for the 2021 BMW 840I, from BOSCH, ÜRO PARTS, GATES and 3 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: 7 options from BOSCH, GATES, FVP and 2 other brands. BOSCH 0392023509 is listed in this group.
This group includes BOSCH 0392023509, ÜRO PARTS 11518482251 and GATES 41244 and the remaining parts above.
Water Pump Gasket
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| AJUSA | 01732500 | 🇺🇸 US | View on Amazon |
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.
This group shows a single part: AJUSA 01732500.
Buying Cooling System Parts for a 2021 BMW 840I
On this vehicle, the cooling system system keeps operating temperature in the narrow band the engine was designed for, from radiator and water pump to thermostat and hoses.
- Confirm you have the 3.0L L6 Turbocharged engine — every part on this page is matched to it.
- Read the notes on each row for position, trim and spec qualifiers before you order.
- Where labor overlaps, replace the thermostat and refill with fresh coolant whenever you change a water pump or radiator; original hoses on an older vehicle are on borrowed time.
- Cross-reference the manufacturer part number against your old part or a service-manual listing.
Start with the largest groups on this page: Coolant / Antifreeze and Temperature Sender / Sensor .
Frequently Asked Questions
How many cooling system parts fit the 2021 BMW 840I?
Our catalog currently lists 56 cooling system parts for the 2021 BMW 840I across 12 subcategories and 25 brands, covering the 3.0L L6 Turbocharged engine. Each part is matched to the engine(s) it fits.
What are the signs of cooling system problems on a 2021 BMW 840I?
Common symptoms include a rising temperature gauge in traffic, sweet-smelling steam, crusty deposits around hose clamps, or a heater that blows cold. If you notice any of these, identify the affected subcategory above and cross-reference the part numbers listed.
What should I replace at the same time?
Where labor overlaps, replace the thermostat and refill with fresh coolant whenever you change a water pump or radiator; original hoses on an older vehicle are on borrowed time.
What do the market flags (US, CA, MX) on each part mean?
They show the market for which the manufacturer published application data for that part — where the vehicle was first sold, not where the part was made. If your 2021 BMW 840I was originally sold in the US, the safest choice is a part marked for the US market.
How do I make sure a part fits my 2021 BMW 840I?
Every part on this page is matched to the 3.0L L6 Turbocharged engine. Then replace coolant with the exact specification the manufacturer calls for — mixing chemistries can gel and block small passages. The notes column carries position and trim qualifiers where they apply.
Other Parts for the 2021 BMW 840I
Cooling System Parts for Other BMW 840I Years
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