The 2025 BMW M340I has 16 cooling system parts with verified fitment on this page — 8 part types and 10 brands, covering the 3.0L L6 Turbocharged engine. Each part includes a manufacturer part number and application notes.
On the 2025 BMW M340I, 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. 10 parts of the 16 listed are Coolant Reservoir (5 parts), Coolant Reservoir Cap (3 parts) and Radiator (2 parts). The other 5 part types cover the remaining 6 parts.
Every part on this page is matched to the 3.0L L6 Turbocharged — the only engine offered in the 2025 BMW M340I.
The most listed brands for 2025 BMW M340I cooling system parts are TECHPRO (4 parts), REIN (2 parts) and MOTORAD (2 parts), plus 7 more brands. Quality grades include Economy and Standard Replacement.
1 part on this 2025 BMW M340I page carries a "Popular" badge — the source catalog's flag for options frequently chosen for this vehicle — TECHPRO BM3014119 (Coolant Reservoir). Click any part number to see every vehicle that part fits.
Coolant / Antifreeze
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| VALVOLINE | 904685 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | 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.
This group shows a single part: VALVOLINE 904685.
Coolant Reservoir
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| TECHPRO Popular | BM3014119 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | G20Auxiliary Tank | View on Amazon |
| REIN | EPT0269 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Radiatorwithout Cap | View on Amazon |
| TECHPRO | BM3014120 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Includes Cap | View on Amazon |
| TECHPRO | BM3014122 | 🇺🇸 US 🇨🇦 CA | Includes Cap | View on Amazon |
| ÜRO PARTS | 17138610652 | 🇺🇸 US | M340i Base Model | View on Amazon |
This table covers the overflow / expansion tanks that hold extra coolant.
5 Coolant Reservoir parts are listed for the 2025 BMW M340I, from TECHPRO, REIN and ÜRO PARTS. TECHPRO BM3014119 carries the "Popular" badge.
This group includes TECHPRO BM3014119, REIN EPT0269 and TECHPRO BM3014120 and the remaining parts above.
Coolant Reservoir Cap
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| CALORSTAT | RC0084 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | RADIATOR | View on Amazon |
| MOTORAD | T76 | 🇺🇸 US | Standard | View on Amazon |
| REIN | CPE0078 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | 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.
3 Coolant Reservoir Cap parts are listed for the 2025 BMW M340I, from CALORSTAT, MOTORAD and REIN.
Listed part numbers: CALORSTAT RC0084, MOTORAD T76 and REIN CPE0078.
Radiator
Economy
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| GPD | 13873C | 🇺🇸 US | Front RightM340i Base Model | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| NISSENS | 606784 | 🇺🇸 US 🇨🇦 CA | Brazed cooling fins | 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.
2 Radiator parts for the 2025 BMW M340I come from 2 brands — GPD and NISSENS.
The Economy section lists 1 option from GPD — the catalog's value-priced group. GPD 13873C is listed in this group.
In the Standard Replacement grade, NISSENS supplies 1 part: built to original-equipment specification. A representative part number is NISSENS 606784.
Part numbers include GPD 13873C and NISSENS 606784.
Radiator Fan Assembly
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| TECHPRO | BM3115148 | 🇺🇸 US 🇨🇦 CA | G20Sedan | View on Amazon |
This table covers the fan assemblies (and clutches, where listed) that pull air through the radiator.
One part is listed for the 2025 BMW M340I — TECHPRO BM3115148.
Temperature Sender / Sensor
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| NISSENS | 207110 | 🇺🇸 US 🇨🇦 CA | Location-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.
This group shows a single part: NISSENS 207110.
Thermostat
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| MOTORAD | TA3156 | 🇺🇸 US 🇨🇦 CA | Includes Seal | 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.
One part is listed for the 2025 BMW M340I — MOTORAD TA3156.
Water Pump
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| FVP | 1153380 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | View on Amazon | |
| GMB | 1153380 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | 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.
2 Water Pump parts are listed for the 2025 BMW M340I, from FVP and GMB.
Listed part numbers: FVP 1153380, plus the other parts above.
Buying Cooling System Parts for a 2025 BMW M340I
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 Reservoir and Coolant Reservoir Cap .
Frequently Asked Questions
How many cooling system parts fit the 2025 BMW M340I?
Our catalog currently lists 16 cooling system parts for the 2025 BMW M340I across 8 subcategories and 10 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 2025 BMW M340I?
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 2025 BMW M340I 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 2025 BMW M340I?
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 2025 BMW M340I
Cooling System Parts for Other BMW M340I Years
Switch vehicle or jump to a subcategory
Manufacturer names, model designations and part numbers are used for identification and fitment reference only. AutoFactsDB is an independent catalog and is not affiliated with, endorsed by, or sponsored by any vehicle manufacturer displayed on this page.