BMW Cooling System Parts & Accessories for BMW 7 Series G11 (2016+)

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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/B48 G...
For vehicles with the earlier Gen1 B46/B48 engine - Not compatible with the later TU en...
2X Entries Into Our F80 M3 Sweepstakes
Rein - Corporate Logo
T#:33679696
Part#: 11118511205
In Stock
$ 50.99 USD
Free Shipping on orders $49 and up
$ 50.99 USD
Free Shipping on orders $49 and up
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...
2X Entries Into Our F80 M3 Sweepstakes
Rein - Corporate Logo
T#:38789910
Part#: CHK0940
Ships on Nov 4, 2026
$ 73.99 USD
Free Shipping on orders $49 and up
$ 73.99 USD
Free Shipping on orders $49 and up
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...
2X Entries Into Our F80 M3 Sweepstakes
Rein - Corporate Logo
T#:39059272
Part#: 11118619408
Back Ordered
$ 47.99 USD
Free Shipping on orders $49 and up
$ 47.99 USD
Free Shipping on orders $49 and up
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 Aluminum Oil Filter Housing - BMW B58
2X Entries Into Our F80 M3 Sweepstakes
Rein - Corporate Logo
T#:49404665
Part#: 11428583901
In Stock
$ 440.00 USD
Free Shipping on orders $49 and up
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.

Precision Raceworks - Corporate Logo
T#:38161689
Part#: 201-0393-BLU
In Stock
$ 109.99 USD
Free Shipping on orders $49 and up

BMW Blue Engine Coolant Reservoir Cap is the perfect upgrade for BMW owners looking to enhance both the performance and appearance of their engine bay. Constructed from high-quality billet aluminum, this cap replaces the flimsy plastic factory cap, offering improved durability and a sleek, high-performance aesthetic.

Designed with precision, this coolant reservoir cap incorporates the OEM pressure relief function to maintain proper cooling system operation. Unlike inferior stick-on covers that may loosen over time, this cap is a complete replacement, ensuring a secure, leak-free fit. The blue anodized finish provides superior corrosion resistance, making it a reliable upgrade for daily drivers and track enthusiasts alike.

  • OEM pressure relief function – Ensures proper cooling system performance and safety
  • Billet aluminum construction – Provides enhanced durability and strength over factory plastic caps
  • Direct-fit replacement – Fully replaces the stock cap for a precise, secure fit
  • Blue anodized finish – Resists corrosion, heat, and wear for long-lasting performance
  • Motorsport-inspired design – Adds a sleek, professional look to the engine bay
  • Built for longevity – Engineered to withstand extreme temperatures and coolant exposure

Upgrade your BMW’s cooling system with the BMW Blue Engine Coolant Reservoir Cap, designed for superior reliability and style.

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OEM Rein Vent Hose - N63 4.4L
2X Entries Into Our F80 M3 Sweepstakes
Rein - Corporate Logo
T#:554680
Part#: 17127576363
Ships in 1 Business Day
$ 26.99 USD
Free Shipping on orders $49 and up

Replace your cracked or leaking radiator hose to prevent further leaks and potentially catastrophic failure.

Fits the following engines:
N63 4.4L


OEM Rein Lower Coolant Hose - N63 4.4L
2X Entries Into Our F80 M3 Sweepstakes
Rein - Corporate Logo
T#:554681
Part#: 17127575427
In Stock at Vendor
$ 51.99 USD
Free Shipping on orders $49 and up

Replace your cracked or leaking radiator hose to prevent further leaks and potentially catastrophic failure.

Fits the following engines:
N63 4.4L

Precision Raceworks - Corporate Logo
T#:38128032
Part#: 201-0394-SIL
Ships in 7 Business Days
$ 94.99 USD
Free Shipping on orders $49 and up

BMW Silver Auxiliary Coolant Reservoir Cap is the perfect upgrade for BMW owners looking to enhance both the aesthetics and functionality of their engine bay. Unlike generic aftermarket caps that overlook critical pressure regulation, this precision-engineered cap retains the OEM pressure release functionality, ensuring safe and reliable coolant system performance.

Crafted from high-quality billet aluminum, this reservoir cap offers superior durability and resistance to heat and fluids, preventing warping or degradation over time. Unlike adhesive-based cap covers that can loosen or fall off, this cap is a direct replacement for the factory component, providing a secure, high-performance solution.

  • OEM pressure release functionality – Maintains proper system regulation for optimal coolant performance
  • Premium billet aluminum construction – Offers enhanced durability and longevity
  • Direct replacement design – Secure fit without adhesives or modifications
  • Resistant to heat and fluids – Ensures long-lasting reliability in extreme conditions
  • Performance-inspired look – Adds a sleek, high-end appearance to your engine bay
  • Upgraded durability – Prevents cracking, leaks, and premature wear

Upgrade your BMW’s cooling system with the BMW Silver Auxiliary Coolant Reservoir Cap, blending performance, reliability, and premium styling.

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Coolant Return Line
2X Entries Into Our F80 M3 Sweepstakes
Rein - Corporate Logo
T#:53856300
Part#: 11538650087
In Stock
New Item
$ 60.99 USD
Free Shipping on orders $49 and up
Rein Automotive turbo hoses are engineered to meet these rigorous demands, providing the reliability required for both the track and the street.

Precision Raceworks - Corporate Logo
T#:38161688
Part#: 201-0393-BLK
Ships in 9 Business Days
$ 109.99 USD
Free Shipping on orders $49 and up

BMW Black Engine Coolant Reservoir Cap is a premium upgrade designed to enhance both the functionality and aesthetics of your BMW’s engine bay. Unlike flimsy plastic OEM caps, this high-performance cap is CNC-machined from durable billet aluminum, providing long-lasting strength and a sleek, motorsport-inspired look.

Built with precision, this cap retains the essential OEM pressure release function, ensuring proper cooling system operation without compromise. Unlike inferior adhesive covers that may detach over time, this cap fully replaces the factory component, delivering a secure and reliable fit. With a corrosion-resistant black anodized finish, it withstands extreme temperatures and harsh conditions while elevating your BMW’s under-hood appearance.

  • OEM pressure regulation – Maintains factory-designed pressure release for optimal cooling performance
  • CNC-machined billet aluminum – Provides exceptional durability and long-term reliability
  • Direct replacement – Fully replaces the stock cap, ensuring a perfect fit without modifications
  • Corrosion-resistant anodized finish – Prevents wear and adds a stealthy, high-performance look
  • Heat and fluid-resistant design – Built to withstand extreme temperatures and coolant exposure
  • Enhanced engine bay styling – Offers a sleek, motorsport-inspired upgrade

Upgrade your BMW’s cooling system with the BMW Black Engine Coolant Reservoir Cap, designed for superior performance and long-lasting durability.

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Rein - Corporate Logo
T#:33946948
Part#: 17139846642
In Stock
$ 99.65 USD
Free Shipping on orders $49 and up

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 Expansion Tank Cap
2X Entries Into Our F80 M3 Sweepstakes
Rein - Corporate Logo
T#:384807
Part#: 17117639021
In Stock
$ 16.99 USD
Free Shipping on orders $49 and up
Cap for plastic expansion tank


OEM Rein Radiator Coolant Return Hose - BMW BMW G30 G12 B48 2.0L ...
For Pre-LCI models only
2X Entries Into Our F80 M3 Sweepstakes
Rein - Corporate Logo
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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Intercooler Expansion Tank
2X Entries Into Our F80 M3 Sweepstakes
Rein - Corporate Logo
T#:584477
Part#: 17137647281
In Stock at Vendor
$ 71.99 USD
Free Shipping
$ 71.99 USD
Free Shipping
Rein - Coolant Return Line - G30 530i, G11 740e
2X Entries Into Our F80 M3 Sweepstakes
Rein - Corporate Logo
T#:33946941
Part#: 17128602870
In Stock
$ 71.99 USD
Free Shipping on orders $49 and up

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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Rein Engine Coolant Reservoir - BMW G1X, G3X
2X Entries Into Our F80 M3 Sweepstakes
Rein - Corporate Logo
T#:52516268
Part#: EPT0274
Back Ordered
New Item
$ 114.99 USD
Free Shipping on orders $49 and up
Protect your BMW investment with the Rein EPT0274 Engine Coolant Reservoir, the professional’s choice for cooling system restoration.

OEM Rein Coolant Expansion Tank Overflow Hose - BMW G30 530e, G12 740...
For Pre-LCI models only
2X Entries Into Our F80 M3 Sweepstakes
Rein - Corporate Logo
T#:45757471
Part#: 17125A02485
Ships in 1 Business Day
$ 41.99 USD
Free Shipping on orders $49 and up
$ 41.99 USD
Free Shipping on orders $49 and up
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 Lower Radiator Hose - G30 G11 G14 G15 G16 - N63
2X Entries Into Our F80 M3 Sweepstakes
Rein - Corporate Logo
T#:55857776
Part#: 17128602669
Ships in 3 Business Days
New Item
$ 49.99 USD
Free Shipping on orders $49 and up
When it comes to keeping your vehicle on the road, a compromised cooling system is a severe vulnerability. Plastic and rubber degrade from constant heat cycling, leading to hairline cracks, swelling, and sudden failure.
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BMW Coolant Expansion Tank - 17139485733
2X Entries Into Our F80 M3 Sweepstakes
Rein - Corporate Logo
T#:45791753
Part#: 17139485733
In Stock at Vendor
$ 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
Free Shipping on orders $49 and up
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 - Corporate Logo
T#:52903294
Part#: 17129844478
Back Ordered
New Item
$ 49.99 USD
Free Shipping on orders $49 and up
Upgrade your cooling system with the Rein Automotive replacement coolant hose, engineered to meet or exceed the rigorous standards of your BMW.

Rein Engine Coolant Hose - BMW G11, G30 5
2X Entries Into Our F80 M3 Sweepstakes
Rein - Corporate Logo
T#:52516262
Part#: CHE0993
Ships in 3 Business Days
New Item
$ 64.99 USD
Free Shipping on orders $49 and up
Restore your cooling system’s integrity with the Rein CHE0993 Engine Coolant Hose.

Turbocharger Coolant Return Line
2X Entries Into Our F80 M3 Sweepstakes
Rein - Corporate Logo
T#:4826913
Part#: 11538485578
Ships in 3 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.
Turbocharger Coolant Return Line
2X Entries Into Our F80 M3 Sweepstakes
Rein - Corporate Logo
T#:4826914
Part#: 11539896890
Ships in 3 Business Days
$ 54.99 USD
Free Shipping on orders $49 and up
Rein Thermostat Assembly - F Chassis, G-Chassis - B48
2X Entries Into Our F80 M3 Sweepstakes
Rein - Corporate Logo
T#:53891628
Part#: 11537644811
Ships in 3 Business Days
New Item
$ 322.99

This product was last offered at the strikethrough price on
06-10-2026

$ 288.99 USD
$ 288.99 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.


Coolant Hose
2X Entries Into Our F80 M3 Sweepstakes
Rein - Corporate Logo
T#:57616350
Part#: 11537643177
Ships in 3 Business Days
New Item
$ 64.99 USD
Free Shipping on orders $49 and up
Maintain maximum thermal efficiency on the track or the street with this precision-engineered turbocharger coolant line by Rein.
Precision Raceworks - Corporate Logo
T#:38161691
Part#: 201-0393-SIL
Ships in 8 Business Days
$ 109.99 USD
Free Shipping on orders $49 and up

BMW Silver Engine Coolant Reservoir Cap is a premium upgrade for BMW owners looking to enhance both the performance and appearance of their engine bay. Crafted from high-strength billet aluminum, this cap replaces the factory plastic version, offering superior durability and a refined, professional look.

Designed with functionality in mind, it integrates the OEM pressure relief system to ensure your engine's cooling system remains safe and efficient. Unlike adhesive covers, which can peel or wear over time, this cap is a direct-fit replacement, providing a secure and leak-proof seal. The silver anodized finish not only enhances the visual appeal but also ensures resistance to corrosion, high temperatures, and wear, making it perfect for daily driving and track use.

  • OEM pressure relief integration – Maintains proper cooling system performance and reliability
  • Durable billet aluminum – Outperforms factory plastic caps in longevity and strength
  • Precision-machined for perfect fitment – Replaces the stock cap securely, not just a cover
  • Anodized silver finish – Offers corrosion, heat, and wear resistance
  • Elevates engine bay aesthetics – Adds a clean, professional appearance
  • Built for both street and track use – Designed to withstand extreme conditions

Enhance your BMW’s cooling system with the BMW Silver Engine Coolant Reservoir Cap, providing both style and functionality for years to come.

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Precision Raceworks - Corporate Logo
T#:38128031
Part#: 201-0394-BLK
Ships in 9 Business Days
$ 94.99 USD
Free Shipping on orders $49 and up

BMW Black Auxiliary Coolant Reservoir Cap is the perfect upgrade for BMW owners looking to enhance both the aesthetics and functionality of their engine bay. Unlike generic aftermarket caps that overlook critical pressure regulation, this precision-engineered cap retains the OEM pressure release functionality, ensuring safe and reliable coolant system performance.

Crafted from high-quality billet aluminum, this reservoir cap offers superior durability and resistance to heat and fluids, preventing warping or degradation over time. Unlike adhesive-based cap covers that can loosen or fall off, this cap is a direct replacement for the factory component, providing a secure, high-performance solution.

  • OEM pressure release functionality – Maintains proper system regulation for optimal coolant performance
  • Premium billet aluminum construction – Offers enhanced durability and longevity
  • Direct replacement design – Secure fit without adhesives or modifications
  • Resistant to heat and fluids – Ensures long-lasting reliability in extreme conditions
  • Performance-inspired look – Adds a sleek, high-end appearance to your engine bay
  • Upgraded durability – Prevents cracking, leaks, and premature wear

Upgrade your BMW’s cooling system with the BMW Black Auxiliary Coolant Reservoir Cap, blending performance, reliability, and premium styling.

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Precision Raceworks - Corporate Logo
T#:38128029
Part#: 201-0394-BLU
Ships in 9 Business Days
$ 94.99 USD
Free Shipping on orders $49 and up

BMW Blue Auxiliary Coolant Reservoir Cap is the perfect upgrade for BMW owners looking to enhance both the aesthetics and functionality of their engine bay. Unlike generic aftermarket caps that overlook critical pressure regulation, this precision-engineered cap retains the OEM pressure release functionality, ensuring safe and reliable coolant system performance.

Crafted from high-quality billet aluminum, this reservoir cap offers superior durability and resistance to heat and fluids, preventing warping or degradation over time. Unlike adhesive-based cap covers that can loosen or fall off, this cap is a direct replacement for the factory component, providing a secure, high-performance solution.

  • OEM pressure release functionality – Maintains proper system regulation for optimal coolant performance
  • Premium billet aluminum construction – Offers enhanced durability and longevity
  • Direct replacement design – Secure fit without adhesives or modifications
  • Resistant to heat and fluids – Ensures long-lasting reliability in extreme conditions
  • Performance-inspired look – Adds a sleek, high-end appearance to your engine bay
  • Upgraded durability – Prevents cracking, leaks, and premature wear

Upgrade your BMW’s cooling system with the BMW Blue Auxiliary Coolant Reservoir Cap, blending performance, reliability, and premium styling.

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Rein - Corporate Logo
T#:53856297
Part#: 11538611277
Ships in 3 Business Days
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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