Rein BMW Cooling System Parts & Accessories for BMW 5 Series G30 (2017+)

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The cooling system is arguably the weakest point in numerous BMWs. If you drive an aging BMW or plan on taking your car to the track like we do, we recommend beefing up your cooling system before going to the track. Generally, the main components in your cooling system that are prone to failure include the following: expansion tank, factory hoses, water pump, thermostat, fan (especially if your vehicle comes factory with a clutch fan), and radiator. Factory BMW expansion tanks are plastic and prone to either breaking off at connection points or combusting. As factory rubber hoses age they either crack or break over time - we offer silicone cooling hose upgrades for most applications to avoid future failures. If you have an older vehicle, your water pump likely comes from the factory with a plastic impeller - we offer upgraded water pumps with metal impellers that are far more reliable. Newer model BMWs utilize electric water pumps - BMW spent millions of dollars engineering these water pumps, but they fail so often that we recommend replacing at 60,000 mile service intervals to avoid being stranded on the side of the road. In terms of thermostats, we offer various upgraded thermostats for racing applications. If your BMW utilizes a clutch fan from the factory, we have several options available in terms of universal electric fans - we recommend replacing these to avoid sending brittle plastic fan blades through your hood. For radiators, we recommend swapping out your radiator for one that does not use plastic connection points like your factory radiator.

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OEM Rein Aluminum Coolant Flange Connector - BMW & MINI B36 B46/B...
For vehicles with the earlier Gen1 B46/B48 engine - Not compatible with the later TU en...
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T#:33679696
Part#: 11118511205
In Stock
$ 50.99 USD
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$ 50.99 USD
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Plastic coolant flanges become brittle over time, which can cause them to crack and fail. Prevent overheating and coolant loss with this OEM Rein upgraded aluminum coolant flange.
Rein Coolant Hose Metal Connector With Sensor - BMW F22/23 F3X B58 Ge...
For models with the earlier B58 Gen1 engine only - Not compatible with the later TU eng...
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T#:38789910
Part#: CHK0940
In Stock
$ 73.99 USD
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$ 73.99 USD
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The OE plastic connector is a frequent failure point due to brittleness and cracking caused by repeated thermal cycling and hydrolysis. Hydrolysis, the breakdown of plastic or rubber by water exposure, weakens the structure over time, leading to failure. To combat these issues, Rein’s upgraded connectors are constructed from high-strength aluminum, eliminating the vulnerabilities of plastic connectors and ensuring long-term durability.
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Rein Coolant Hose Aluminum Connector - BMW F22/23 F3X B58 Gen1 ...
For models with the earlier B58 Gen1 engine only - Not compatible with the later TU eng...
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T#:39059272
Part#: 11118619408
Back Ordered
$ 47.99 USD
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$ 47.99 USD
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The OE plastic connector is a frequent failure point due to brittleness and cracking caused by repeated thermal cycling and hydrolysis. Hydrolysis, the breakdown of plastic or rubber by water exposure, weakens the structure over time, leading to failure. To combat these issues, Rein’s upgraded connectors are constructed from high-strength aluminum, eliminating the vulnerabilities of plastic connectors and ensuring long-term durability.
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OEM Rein Lower Coolant Hose - N63 4.4L
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T#:554681
Part#: 17127575427
Ships in 4 Business Days
$ 51.99 USD
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Replace your cracked or leaking radiator hose to prevent further leaks and potentially catastrophic failure.

Fits the following engines:
N63 4.4L


OEM Rein Vent Hose - N63 4.4L
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T#:554680
Part#: 17127576363
Ships in 2 Business Days
$ 26.99 USD
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Replace your cracked or leaking radiator hose to prevent further leaks and potentially catastrophic failure.

Fits the following engines:
N63 4.4L

Rein Transmission Oil Heat Exchanger Hose F33 430i, F23 230iX, F31 33...
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T#:33913483
Part#: 17127640287
Ships in 4 Business Days
$ 38.99 USD
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The Hose Transmission Oil Heat Exchanger is a crucial component in maintaining the longevity and performance of your vehicle's transmission system. This part is designed to efficiently cool down the transmission oil, ensuring that your transmission operates at optimal temperatures, reducing wear and tear. Available at Turner Motorsport, this high-quality heat exchanger is engineered to meet the demands of high-performance vehicles, making it an excellent choice for both daily drivers and track enthusiasts.

  • Optimizes transmission oil temperature to prevent overheating
  • Enhances the lifespan of your transmission system
  • Durable construction for long-lasting performance
  • Ideal for performance and high-demand driving conditions
  • Compatible with a wide range of vehicle makes and models

    Upgrade your vehicle’s transmission cooling system with the Hose Transmission Oil Heat Exchanger and drive with confidence knowing your transmission is protected.

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OEM Rein Radiator Coolant Return Hose - BMW BMW G30 G12 B48 2.0L ...
For Pre-LCI models only
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T#:45757472
Part#: 17128602603
In Stock
$ 69.99

This product was last offered at the strikethrough price on
05-15-2026

$ 58.99 USD
Limited Qty Sale
Free Shipping on orders $49 and up
$ 69.99

This product was last offered at the strikethrough price on
05-15-2026

$ 58.99 USD
Limited Qty Sale
Free Shipping on orders $49 and up
This coolant hose connects the lower radiator outlet port to the engine. Coolant hoses can become brittle and crack over time. If your coolant hose has begun to leak, replace it as soon as possible to prevent coolant loss and overheating.
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OEM Rein Expansion Tank w/ Cap - G30 540iX, G32 640iX, G11 740i ...
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T#:33946948
Part#: 17139846642
In Stock
$ 99.65 USD
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The Expansion Tank is an essential part of your vehicle’s cooling system, designed to accommodate the expansion of coolant as it heats up during engine operation. This high-quality tank helps regulate coolant pressure, preventing overheating and ensuring optimal engine performance. Built to meet or exceed OEM standards, this expansion tank is crafted from durable, heat-resistant materials to provide long-lasting reliability. It offers a direct fit for a wide range of European vehicles, ensuring easy installation.

  • Prevents Overheating: Manages coolant expansion to maintain consistent engine temperature.
  • Durable Construction: Made from premium, heat-resistant materials to ensure long-term durability.
  • OEM Quality Fit: Designed for a precise fit, meeting or exceeding original equipment specifications.
  • Leak-Proof Design: Provides a secure seal to prevent coolant loss and maintain system efficiency.
  • Easy Installation: Direct replacement part, compatible with a variety of European vehicle models.

Find the Rein Expansion Tank at Turner Motorsport for top-quality replacement parts and reliable performance.

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Rein - Coolant Return Line - G30 530i, G11 740e
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T#:33946941
Part#: 17128602870
In Stock
$ 71.99 USD
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The Radiator Hose - Coolant Return Line is a critical component for maintaining an efficient cooling system in your vehicle. Engineered for durability and optimal performance, this hose ensures the proper circulation of coolant, preventing engine overheating and extending the life of your engine. Designed for a wide range of European vehicles, the coolant return line guarantees a perfect fit and smooth installation. Ideal for both DIY enthusiasts and professional mechanics, this high-quality replacement hose ensures your engine runs at peak performance.

  • Enhanced Durability: Made from high-grade materials to withstand extreme temperatures and pressure.
  • Prevents Overheating: Ensures proper coolant flow, maintaining the engine’s optimal temperature.
  • OEM Fitment: Designed to meet or exceed original equipment standards for European vehicles.
  • Leak-Proof Design: Provides a secure and leak-resistant connection to prevent coolant loss.
  • Easy Installation: Hassle-free replacement with compatibility across multiple vehicle makes and models.

For a reliable replacement, get the Radiator Hose - Coolant Return Line Rein.

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Intercooler Expansion Tank
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T#:584477
Part#: 17137647281
In Stock
$ 71.99

This product was last offered at the strikethrough price on
06-04-2026

$ 64.99 USD
Limited Qty Sale
Free Shipping
$ 71.99

This product was last offered at the strikethrough price on
06-04-2026

$ 64.99 USD
Limited Qty Sale
Free Shipping
Turbocharger Coolant Return Line
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T#:4826914
Part#: 11539896890
Ships in 4 Business Days
$ 54.99 USD
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Rein Engine Coolant Hose - Upper Radiator To Expansion Tank - BMW G3X...
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T#:52903294
Part#: 17129844478
Ships in 4 Business Days
New Item
$ 49.99 USD
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Upgrade your cooling system with the Rein Automotive replacement coolant hose, engineered to meet or exceed the rigorous standards of your BMW.


Coolant Return Line
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T#:53856300
Part#: 11538650087
Ships in 4 Business Days
New Item
$ 60.99 USD
$ 60.99 USD
Rein Automotive turbo hoses are engineered to meet these rigorous demands, providing the reliability required for both the track and the street.
Rein Thermostat Assembly - F Chassis, G-Chassis - B48
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T#:53891628
Part#: 11537644811
Ships in 4 Business Days
New Item
$ 322.99 USD
$ 322.99 USD
Whether you're managing a fleet of "spirited" daily drivers or prepping a chassis for the circuit, the Rein CTA0079 offers the peace of mind that comes with OE-quality engineering.
BMW Coolant Expansion Tank - 17139485733
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T#:45791753
Part#: 17139485733
Ships in 4 Business Days
$ 64.99

This product was last offered at the strikethrough price on
04-28-2026

$ 52.99 USD
Free Shipping on orders $49 and up
$ 52.99 USD
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Expansion tanks take constant abuse from high heat and harsh coolant, making them prone to cracking or failure over time. A damaged tank can quickly lead to overheating and serious engine damage, so replacement is critical at the first sign of trouble. Features: Direct fitment for hassle-free installation Precision-molded to OE specs for perfect sensor and hose connections Durable construction stands up to extreme heat and coolant chemicals Factory pressure-tested for reliable performance
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Rein Engine Coolant Hose - BMW G11, G30 5
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T#:52516262
Part#: CHE0993
Ships in 4 Business Days
New Item
$ 64.99 USD
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Restore your cooling system’s integrity with the Rein CHE0993 Engine Coolant Hose.

Turbocharger Coolant Return Line
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T#:4826913
Part#: 11538485578
Ships in 4 Business Days
$ 66.99 USD
Free Shipping on orders $49 and up
Cylinder 1-4 Turbo Return Line. Keep your turbos healthy and lubricated. Rein quality replacement turbo return line.
OEM Rein Turbocharger Coolant Supply Line - BMW Gen2 B46/B48 2.0L ...
For models with the Gen2 B46/B48 engine only - Not for earlier Gen1 engines
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T#:34315143
Part#: 11538629971
Ships in 4 Business Days
$ 47.99

This product was last offered at the strikethrough price on
04-28-2026

$ 42.99 USD
Free Shipping on orders $49 and up
$ 42.99 USD
Free Shipping on orders $49 and up
Turbo coolant supply lines feed coolant to the turbocharger, ensuring temperatures are kept in check. If your coolant line is leaking, it is important to replace it as soon as possible to prevent coolant loss, overheating, and turbo damage.
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OEM Rein Coolant Expansion Tank Overflow Hose - BMW G30 530e, G12 740...
For Pre-LCI models only
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T#:45757471
Part#: 17125A02485
Ships in 4 Business Days
$ 41.99 USD
Free Shipping on orders $49 and up
$ 41.99 USD
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This hose connects the expansion tank to the radiator. If your coolant expansion tank hose is cracked or leaking, replace it early to prevent further coolant loss and eventual overheating.
Rein Water Feed Tube with O-Ring G20 330i, G30 530i, G01 X3 30i ...
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T#:34181294
Part#: 11538854737
Ships in 4 Business Days
$ 46.99 USD
Free Shipping on orders $49 and up

The Rein Water Feed Tube with O-ring CHT0924 is a premium replacement part designed for BMW vehicles, ensuring optimal engine cooling performance. Manufactured with high-quality materials, this water feed tube guarantees durability and a precise fit, making it an ideal solution for restoring or upgrading your BMW’s cooling system. Available through Turner Motorsport, this part ensures the prevention of coolant leaks and maintains the efficiency of your vehicle’s cooling system.

This water feed tube is engineered to withstand the intense heat and pressure found in high-performance engines, delivering long-lasting reliability. It’s compatible with a variety of BMW models, making it a versatile choice for both professional mechanics and DIY enthusiasts.

Benefits:

  • Precise fitment: Specifically designed for BMW applications to ensure seamless replacement.
  • High-quality materials: Built to endure high-temperature and high-pressure environments.
  • O-ring seal: Ensures a leak-proof connection, preventing coolant loss and engine overheating.
  • Optimized engine performance: Helps maintain consistent engine temperatures for improved vehicle performance.
  • Available at Turner Motorsport: Trusted source for BMW parts and accessories.

Keep your BMW running smoothly with the Rein Water Feed Tube with O-ring CHT0924, designed to restore your cooling system’s functionality and keep your engine in peak condition.

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Rein Engine Coolant Reservoir - BMW G1X, G3X
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T#:52516268
Part#: EPT0274
Ships in 4 Business Days
New Item
$ 114.99 USD
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Protect your BMW investment with the Rein EPT0274 Engine Coolant Reservoir, the professional’s choice for cooling system restoration.

Rein Aluminum Oil Filter Housing - BMW B58
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T#:49404665
Part#: 11428583901
In Stock at Vendor
New Item
$ 408.99 USD
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For those who push their engines to the limit, "good enough" is a liability. Upgrade to the Rein HEU0116 Aluminum Oil Filter Housing—the professional’s choice for durability and peace of mind.
Rein Expansion Tank Cap
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T#:384807
Part#: 17117639021
In Stock
$ 16.99 USD
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Cap for plastic expansion tank
Rein Turbo Coolant Hose - F22/23, F30/34, F32/33, F36, G01, G02, G11,...
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T#:53856297
Part#: 11538611277
Back Ordered
New Item
$ 44.99 USD
$ 44.99 USD
Rein Automotive Turbo Hoses are engineered to meet these rigorous standards, utilizing premium, OE-quality materials specifically formulated to withstand the extreme duty cycles of modern forced-induction systems.
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