BMW Cooling System Parts & Accessories for BMW G01 X3 xDrive30i B46 2.0L

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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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Water Pump & Thermostat Kit - Gen 1 B46 2.0L
For model years 2018-2019
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Packaged by Turner - Corporate Logo
T#:35863149
Part#: 11518638026TKT
In Stock
Sale - Save 5% $ 731.99

This product was last offered at the strikethrough price on
06-30-2026

$ 696.75 USD
Free Shipping on orders $49 and up
Sale - Save 5%
$ 731.99

This product was last offered at the strikethrough price on
06-30-2026

$ 696.75 USD
Free Shipping on orders $49 and up
BMW's cooling system has long been a known weak spot, with the water pump and thermostat being two of the most common trouble areas. This remains true even in the latest B-Series engines found in 2016 and newer BMW models. This kit includes a brand-new OEM Pierburg water pump, a Bremmen thermostat (now referred to as a Heat Management Module), and one gallon of BMW's G48 coolant concentrate (enough to make two gallons of 50/50 coolant). Avoid spending thousands at the dealership or over $600 on Genuine BMW parts! These components can be replaced with high-quality OEM parts in just an afternoon using basic hand tools.
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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...
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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 Radiator Engine Hose G01 X3 30iX, G02 X4 30i
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Rein - Corporate Logo
T#:33946916
Part#: 17127535529
In Stock
$ 73.99 USD
Free Shipping on orders $49 and up

The Rein Radiator Engine Hose is a top-quality component designed to optimize your vehicle’s cooling system by ensuring efficient coolant flow between the radiator and engine. This durable hose helps regulate engine temperature, preventing overheating and maintaining peak engine performance. Available at Turner Motorsport, the Rein Radiator Engine Hose is made from high-grade materials, ensuring long-lasting reliability and compatibility with various vehicle models, making it a perfect choice for both high-performance and everyday driving needs.

  • Optimizes coolant flow between radiator and engine
  • Prevents engine overheating and ensures consistent temperature control
  • Enhances engine performance and efficiency
  • Made from high-quality, durable materials for long-term use
  • Compatible with a wide range of vehicle models
  • Available from Turner Motorsport, a trusted source for performance automotive parts

Upgrade your vehicle’s cooling system with the Rein Radiator Engine Hose for superior engine protection and reliable performance under all driving conditions.

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Rein Automotive Turbocharger Coolant Pipes CHT0903
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Rein - Corporate Logo
T#:34147743
Part#: 11537643094
Ships in 2 Business Days
$ 61.99 USD
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Turbocharger Coolant Pipes CHT0903 are high-performance components designed to efficiently manage coolant flow in turbocharged engines. Available from Turner Motorsport, these coolant pipes are specifically engineered for BMW vehicles, ensuring optimal cooling of the turbocharger system. By maintaining the right temperature, these pipes help extend the lifespan of your turbocharger while improving engine performance and efficiency.

These Turbocharger Coolant Pipes offer a perfect OEM fit for easy installation, making them ideal for both professionals and BMW enthusiasts. Crafted from durable, heat-resistant materials, they ensure long-lasting reliability and resistance to wear and tear, providing a robust solution for maintaining the performance of your vehicle’s turbocharged engine.

Key Features:

  • Specifically designed for turbocharged BMW engines
  • Perfect OEM fit for seamless installation
  • Efficiently manages coolant flow to the turbocharger
  • Enhances turbocharger performance and engine efficiency
  • Made from durable, heat-resistant materials
  • Available from Turner Motorsport, a trusted provider of high-quality BMW parts

For anyone looking to maintain or upgrade their BMW’s turbocharged engine, these Turbocharger Coolant Pipes are a crucial component that ensures optimal cooling and long-term reliability.

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OEM Rein Coolant Expansion Tank Overflow Hose - BMW G01 G02 Gen1 B46/...
For early models with the Gen1 B46/B48 engine - Not for vehicles with the later TU engines
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Rein - Corporate Logo
T#:45757470
Part#: 17125A022D6
Back Ordered
$ 35.99 USD
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$ 35.99 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.
OEM Rein Coolant Expansion Tank - F97 F98 G01 G02 B46 B58 S58 ...
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Rein - Corporate Logo
T#:39059266
Part#: 17135A6A030
In Stock
$ 86.99

This product was last offered at the strikethrough price on
07-07-2026

$ 75.99 USD
Limited Qty Sale
Free Shipping on orders $49 and up
$ 86.99

This product was last offered at the strikethrough price on
07-07-2026

$ 75.99 USD
Limited Qty Sale
Free Shipping on orders $49 and up
Coolant expansion tanks can crack over time, especially during services where they need to be removed. Replace your tank with a brand new tank to ensure your cooling system remains leak-free.

Rein Thermostat Assembly - F Chassis, G-Chassis - B48
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Rein - Corporate Logo
T#:53891628
Part#: 11537644811
Ships in 4 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.
Rein Coolant Expansion Tank - With Cap
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Rein - Corporate Logo
T#:53891623
Part#: 17135A6A030C
Ships in 4 Business Days
New Item
$ 99.99 USD
$ 99.99 USD
Replace your old brittle expansion tank

Rein Radiator Hose G01 X3 30i, G02 X4 30i
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Rein - Corporate Logo
T#:33913472
Part#: 17127535531
In Stock at Vendor
$ 52.99 USD
Free Shipping on orders $49 and up
This Radiator Hose is a replacement part designed to ensure optimal coolant flow and long-lasting performance for your vehicle's cooling system. Manufactured with high-quality materials, this hose resists wear and tear caused by extreme temperatures, pressure, and chemical exposure. Turner Motorsport offers radiator hoses that are engineered to meet or exceed OEM specifications, providing a perfect fit for a variety of vehicle makes and models.
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Rein Water Feed Tube with O-Ring G20 330i, G30 530i, G01 X3 30i ...
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Rein - Corporate Logo
T#:34181294
Part#: 11538854737
Ships in 4 Business Days
$ 46.99 USD
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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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OEM Rein Coolant Expansion Tank Hose - BMW G01 G02 Gen1 B46
For Pre-LCI models with the earlier Gen1 B46 engine only
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Rein - Corporate Logo
T#:45757473
Part#: 17127535536
Ships in 4 Business Days
$ 76.00

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

$ 73.99 USD
Free Shipping on orders $49 and up
$ 73.99 USD
Free Shipping on orders $49 and up
This hose connects the heat management module to the expansion tank's lower port. If your coolant expansion tank hose is cracked or leaking, replace it early to prevent further coolant loss and eventual overheating.
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Rein - Radiator Hose - X3 sDrive30i, X4 xDrive30i
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Rein - Corporate Logo
T#:33946933
Part#: 17129894739
Ships in 4 Business Days
$ 54.99 USD
$ 54.99 USD

Rein Radiator Hose

The Rein - Radiator Hose is a premium solution for maintaining your vehicle's cooling system. Manufactured with high-quality materials, it offers superior resistance to heat, pressure, and wear, ensuring optimal performance for an extended period. Designed specifically for European vehicles, this radiator hose guarantees a perfect fit and seamless installation, making it ideal for both professional mechanics and DIY enthusiasts. Rein's durable and flexible construction helps prevent leaks, keeps engine temperatures stable, and extends engine life.

  • Superior Heat and Pressure Resistance: Built to endure extreme engine conditions, minimizing the risk of overheating.
  • OEM Fitment: Designed to meet or exceed the original specifications for European vehicles, ensuring a precise fit.
  • Long-lasting Durability: Made from premium rubber, reinforced for longevity and optimal performance.
  • Leak Prevention: Provides a tight, leak-proof connection, ensuring no coolant loss.
  • Easy Installation: Perfect for quick replacement, compatible with a variety of makes and models.

Get the Rein Radiator Hose from Turner Motorsport, where quality parts meet precision engineering.

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OEM Rein Coolant Expansion Tank Hose - BMW G01 G02 Gen1 B46
For Pre-LCI models with the earlier Gen1 B46 engine only
affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms
Rein - Corporate Logo
T#:45757474
Part#: 17127535528
Ships in 2 Business Days
$ 53.99

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

$ 51.99 USD
Free Shipping on orders $49 and up
$ 51.99 USD
Free Shipping on orders $49 and up
This hose connects the cylinder head to the expansion tank's upper port. If your coolant expansion tank hose is cracked or leaking, replace it early to prevent further coolant loss and eventual overheating.
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