2021 BMW M550I 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

14 Coolant / Antifreeze parts are listed for the 2021 BMW M550I, 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, PEAK and VALVOLINE 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 5 options from VALVOLINE, AISIN and PEAK — built to original-equipment specification. VALVOLINE 859537 is listed in this group.

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

This group shows a single part: REIN EPT0274.

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 M550I come from 3 brands — REIN, CALORSTAT and MOTORAD. The "Popular" part is REIN CPE0034.

Listed part numbers: REIN CPE0034, CALORSTAT RC0084 and CALORSTAT RC0087, 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

5 Radiator parts are listed for the 2021 BMW M550I, from MAHLE / CLEVITE, GPD and NISSENS. GPD 13800C carries the "Popular" badge.

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

The Standard Replacement section: 4 options from MAHLE / CLEVITE and NISSENS. MAHLE / CLEVITE CR936000P is listed in this group.

Part numbers include GPD 13800C, MAHLE / CLEVITE CR936000P and MAHLE / CLEVITE CR2215000P, among others listed above.

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

3 Radiator Fan Assembly parts for the 2021 BMW M550I come from 3 brands — TECHPRO, MAHLE / CLEVITE and VDO / CONTINENTAL.

The Economy section: 1 option from TECHPRO. TECHPRO BM3115143 is listed in this group.

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

Listed part numbers: TECHPRO BM3115143, MAHLE / CLEVITE CFF549000P and VDO / CONTINENTAL FA74020.

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. Read more

This group shows a single part: REIN CHR0978.

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

9 Temperature Sender / Sensor parts are listed for the 2021 BMW M550I, from GPD, STANDARD MOTOR PRODUCTS, WALKER PRODUCTS and 3 other brands. STANDARD MOTOR PRODUCTS TS658 carries the "Popular" badge.

Economy: 3 parts, from GPD and VEMO. A representative part number is GPD 1814545.

The Standard Replacement section: 6 options from STANDARD MOTOR PRODUCTS, WALKER PRODUCTS, FACET and 1 other brand. STANDARD MOTOR PRODUCTS TS658 is listed in this group.

Part numbers include STANDARD MOTOR PRODUCTS TS658, GPD 1814545 and GPD 1814574, 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

2 Thermostat parts for the 2021 BMW M550I come from 2 brands — DORMAN and MOTORAD.

The Economy section: 1 option from DORMAN. DORMAN 9025954 is listed in this group.

Standard Replacement: 1 part, from MOTORAD. A representative part number is MOTORAD 986221.

This group includes DORMAN 9025954 and MOTORAD 986221.

This table covers the seals at the thermostat housing and water outlet. Typical signs include a wet housing, a drip after sitting, or fluid flung off a rotating shaft. Fix the surface the seal rides on. A new seal on a grooved shaft will leak again. Read more

2 Thermostat / Thermostat Housing / Water Outlet Seal parts are listed for the 2021 BMW M550I, from FEL-PRO and MAHLE / CLEVITE.

Part numbers include FEL-PRO 36226 and MAHLE / CLEVITE C32504.

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

7 Water Pump parts for the 2021 BMW M550I come from 5 brands — BOSCH, FVP, GMB and 2 other brands. The "Popular" part is BOSCH 0392023509.

This group includes BOSCH 0392023509, BOSCH 0392023487 and BOSCH 039202411V and the remaining parts above.