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Rein BMW Cooling System Parts & Accessories

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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T#:20617632
Part#: 11537830715KT
In Stock
$ 53.98 USD
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Both thermostat housing hoses to replace your worn out rubber and brittle plastic connections.

Over the years and with exposure to extremely hot coolant, the coolant hoses in your vehicle can take a beating. Being made of reinforced rubber, these hoses can fail in a number of ways. Splitting at a hose clamp, swelling, cracking, and breaking are just a few of the ways this hose can leave you stranded. Replace it at the first sign of wear to keep your coolant in your engine.

Comes with both upper and lower thermostat hoses: 11537830715 Lower + 11537830716 Upper

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Rein - Corporate Logo
T#:35875
Part#: 11531703844
Ships in 1 day
$ 9.17 USD
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BMW HOSE F RADIATOR AND ENGINE R
Rein - Corporate Logo
T#:402140
Part#: 17111436250
In Stock
$ 70.99 USD
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$ 70.99 USD
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Rein - Corporate Logo
T#:384807
Part#: 17117639021
In Stock
$ 16.99 USD
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Cap for plastic expansion tank

Rein - Corporate Logo
T#:20530
Part#: 64216951946
In Stock
$ 26.99

This product was last offered at the strikethrough price on
03-26-2026

$ 21.99 USD
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$ 21.99 USD
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HOSE F RADIATOR AND ENGINE R 64216951946 Manufactured by CRP

Rein - Corporate Logo
T#:38161728
Part#: 11515A05704
Ships on Sep 22, 2026
$ 749.99 USD
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Rein - Corporate Logo
T#:379777
Part#: 64218391003
Special Order: No Guaranteed ETA
$ 31.99 USD
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$ 31.99 USD
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Hose that runs from the engine block to the water valve. Over time, coolant hoses begin to get brittle and are susceptible to cracking and splitting. Replace your cracked or leaking coolant hose to prevent further leaks and potentially catastrophic failure.
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Rein - Corporate Logo
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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Rein - Corporate Logo
T#:4826895
Part#: 17128570061
In Stock
$ 38.99 USD
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Replace your cracked or leaking radiator hose to prevent further leaks and potentially catastrophic failure. This item fits the following BMW Chassis: F22,F30,F31,F32,F33,F34,F36 Fits BMW Engines including: N55
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Rein - Corporate Logo
T#:19458
Part#: 17111427156
Ships on Sep 22, 2026
$ 5.99 USD
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Rein Coolant Overflow Hose is designed to meet the highest standards of performance and durability for your vehicle's cooling system. This high-quality hose ensures the proper transfer of excess coolant from the engine to the overflow reservoir, preventing overheating and ensuring optimal engine performance. Manufactured from reinforced rubber materials, the Rein Coolant Overflow Hose guarantees long-lasting reliability and precise fitment for various vehicle makes and models. It’s the perfect upgrade or replacement for worn-out hoses in any cooling system.

Available through Turner Motorsport, this coolant overflow hose is rigorously tested to withstand extreme temperatures, pressures, and daily use. If you’re looking to maintain or improve your car's cooling efficiency, the Rein Coolant Overflow Hose is an essential component.

  • Precision engineered for a perfect fit
  • Manufactured from durable, reinforced rubber
  • Designed to withstand high temperatures and pressures
  • Improves cooling system efficiency and prevents overheating
  • Easy installation with OE-spec dimensions
  • Available at Turner Motorsport, trusted for automotive parts

Enhance your vehicle's performance and reliability by replacing your old coolant hose with the Rein Coolant Overflow Hose today.

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Rein - Corporate Logo
T#:34181285
Part#: 17129845173
Ships in 2 Business Days
$ 29.99 USD
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Rein Cylinder Head Expansion Tank Hose CHE0925 is a top-quality component designed specifically for BMW vehicles, ensuring optimal coolant flow between the cylinder head and expansion tank. This hose is engineered to withstand high engine temperatures and pressures, preventing coolant leaks and safeguarding the engine from overheating. The Rein Cylinder Head Expansion Tank Hose CHE0925 is perfect for BMW enthusiasts who prioritize vehicle reliability and performance.

Manufactured from premium materials, this hose guarantees durability and longevity under demanding conditions. Its precise design ensures a perfect fit, making installation easy for both professional mechanics and DIY car enthusiasts. Available from Turner Motorsport, this product is an excellent choice for anyone looking to maintain peak engine performance.

Key Benefits:

  • Designed specifically for BMW vehicles to ensure a perfect fit and compatibility
  • Regulates coolant flow, preventing engine overheating and damage
  • Made from high-quality, durable materials that withstand extreme engine conditions
  • Easy installation for quick maintenance and hassle-free replacement
  • Ideal for both professional mechanics and DIY car enthusiasts
  • Available from Turner Motorsport, a trusted supplier of BMW parts

The Rein Cylinder Head Expansion Tank Hose CHE0925 is a must-have part for maintaining the cooling efficiency and overall health of your BMW engine.

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T#:34114243
Part#: 11531710953
Ships in 1 Business Day
$ 19.99 USD
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Thermostat 80C is a crucial component for controlling the temperature in BMW engines, ensuring optimal performance and protection. Designed to open at 80°C, this thermostat helps your engine reach its ideal operating temperature quickly while preventing overheating. Engineered specifically for BMW vehicles, the Thermostat 80C ensures precise temperature regulation, enhancing both engine efficiency and longevity. Available at Turner Motorsport, this direct-fit replacement offers easy installation and reliable performance.

  • Designed for BMW engines for a perfect fit
  • Opens at 80°C to regulate coolant flow and maintain optimal temperature
  • Prevents overheating and improves engine efficiency
  • Manufactured from high-quality, durable materials for long-lasting use
  • Direct-fit replacement ensures hassle-free installation
  • Enhances overall engine performance and longevity

The Thermostat 80C from Turner Motorsport is the perfect choice for BMW owners looking to maintain optimal engine temperature, ensuring smooth operation and extending the life of their vehicle.

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Rein - Corporate Logo
T#:17738369
Part#: 17127540020
In Stock at Vendor
$ 40.83 USD
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Coolant hoses can become brittle over time, leading to cracks and leaks. Replace your coolant hose with this OEM Rein hose to prevent leaks and overheating.
Rein - Corporate Logo
T#:386411
Part#: 11511439976
Back Ordered
$ 14.99

This product was last offered at the strikethrough price on
08-12-2026

$ 13.99 USD
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$ 13.99 USD
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This is the coolant return pipe on the back of the water pump on the N62 and N73 engines used in the E53 X5, E60 545/550, E63 645/650, E65 745/750, E70 X5, and F02 750. This pipe connects the water pump to the valley pan and it's a compression fitting (no o-rings). Whenever the water pump or valley pan are replaced this tube should also be replaced. This is one area where you don't want to go back and re-do your work because of a leaking fitting! In German, Rein means Pure. In the automotive industry the Rein name has quickly come to represent quality. With fitments for some of the worldaEURtms finest automobiles including BMW and Mini and guaranteed OE quality, Rein is a name you can trust.
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Rein - Corporate Logo
T#:393385
Part#: 11517548263
In Stock
$ 215.99 USD
Free Shipping
$ 215.99 USD
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In German, Rein means Pure. In the automotive industry the Rein name has quickly come to represent quality. With fitments for some of the worldaEURtms finest automobiles including BMW and Mini and guaranteed OE quality, Rein is a name you can trust. Replace your water pump with Rein to get your cooling system back in check.
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Rein - Corporate Logo
T#:11094
Part#: 64218391122
Back Ordered
$ 6.54 USD
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This is the hose that runs from the left radiator to the water valve. Over time, coolant hoses begin to get brittle and are susceptible to cracking and splitting. Replace your cracked or leaking coolant hose to prevent further leaks and potentially catastrophic failure.

 

This item fits the following BMWs: 
1999-2001 E38 BMW 740i 740il

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Rein - Corporate Logo
T#:6976
Part#: 11531745595
Ships in 3 Business Days
$ 16.99 USD
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ENGINE WATER HOSE 11531745595.--

This item fits the following BMWs:
BMW 5 Series - 540i, 540i Wagon
BMW 7 Series - 740i, 740iL

--.
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Rein - Corporate Logo
T#:379773
Part#: 17123424499
Back Ordered
$ 36.99 USD
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Over time, coolant hoses begin to get brittle and are susceptible to cracking and splitting. Replace your cracked or leaking coolant hose to prevent further leaks and potentially catastrophic failure.

Rein - Corporate Logo
T#:388645
Part#: 17111436381
In Stock at Vendor
$ 87.99 USD
Free Shipping
$ 87.99 USD
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BMW E39 Coolant Expansion Tank is an essential component designed to maintain the proper coolant level in your vehicle's cooling system. Manufactured with high-quality materials, this expansion tank ensures reliable performance and durability, preventing engine overheating by accommodating the expansion of coolant as it heats up. The kit includes a level sensor and cap, providing everything needed for a seamless installation. This expansion tank is specifically engineered to meet the exact specifications of your BMW E39, offering a perfect fit and optimal functionality.

  • Complete Kit: Includes level sensor and cap for easy installation.
  • High-Quality Construction: Built with durable materials for long-lasting performance.
  • Prevents Overheating: Helps manage coolant expansion, ensuring engine protection.
  • Exact Fit: Designed to meet the precise specifications of your BMW E39.
  • Enhanced Reliability: Ensures proper coolant level maintenance for optimal cooling system function.
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Rein - Corporate Logo
T#:402139
Part#: 17111436251
Ships in 1 Business Day
$ 80.99 USD
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$ 80.99 USD
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Mounts to the side of the radiator for retaining the expansion tank

Rein - Corporate Logo
T#:375750
Part#: 17127508015
Back Ordered
$ 29.99 USD
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Attaches from the bottom fitting on the expansion tank to the supply hose. Over time, coolant hoses begin to get brittle and are susceptible to cracking and splitting. Replace your cracked or leaking coolant hose to prevent further leaks and potentially catastrophic failure.
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Rein Expansion Tank Hose - E53
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Rein - Corporate Logo
T#:375755
Part#: 11537500735
Ships in 3 Business Days
$ 24.99 USD
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To maintain peak performance, a BMW's cooling system must remain perfectly pressurized. On the E53 X5, the expansion tank hose acts as a vital conduit in this thermal cycle, managing the flow of expanding coolant back and forth between the auxiliary water pump and reservoir. Over years of severe under-hood heat cycles, the factory rubber loses its elasticity and the plastic connectors turn brittle, establishing a high risk for spontaneous splitting.
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T#:45757470
Part#: 17125A022D6
Ships in 1 Business Day
$ 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.
Rein - Corporate Logo
T#:592029
Part#: 17138616418
Ships in 3 Business Days
$ 85.99 USD
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$ 85.99 USD
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Replaced your cracked unit with a new coolant expansion tank


Rein - Corporate Logo
T#:6979
Part#: 11537500733
Back Ordered
$ 40.99 USD
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This upper radiator cooling hose connects the drivers side top of the radiator to the thermostat housing on X5 3.0i with the M54 engine.

This item fits the following BMWs:
2000-2006 E53 BMW X5 3.0i M54
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Rein - Corporate Logo
T#:592886
Part#: 11511714519
Back Ordered
$ 9.17 USD
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Rein - Corporate Logo
T#:20514
Part#: 64211390935
Back Ordered
$ 12.99 USD
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HOSE F WATER VALVE AND LEFT 64211390935 Manufactured by CRP


Rein - Corporate Logo
T#:593082
Part#: 17221728944
Ships in 3 Business Days
$ 28.99 USD
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$ 28.99 USD
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Transmission Oil Cooler to Water Manifold

Rein - Corporate Logo
T#:375745
Part#: 17127508010
Back Ordered
$ 134.99 USD
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$ 134.99 USD
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Over time, coolant hoses begin to get brittle and are susceptible to cracking and splitting. Replace your cracked or leaking coolant hose to prevent further leaks and potentially catastrophic failure.
Rein - Corporate Logo
T#:379785
Part#: 17111737819
Back Ordered
$ 26.99 USD
Free Shipping on orders $49 and up
Connects the expansion tank to the radiator

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T#:14122755
Part#: 17117514402
Back Ordered
$ 8.99

This product was last offered at the strikethrough price on
08-12-2026

$ 8.24 USD
Free Shipping on orders $49 and up
$ 8.24 USD
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Mounts to top of radiator bracket, 2 per vehicle.
Rein - Corporate Logo
T#:45757476
Part#: 17128651298
Back Ordered
$ 31.99 USD
Free Shipping on orders $49 and up
This hose connects the expansion tank to the upper radiator hose. If your coolant expansion tank hose is cracked or leaking, replace it early to prevent further coolant loss and eventual overheating.

Rein - Corporate Logo
T#:379702
Part#: 17127508014
Back Ordered
$ 25.99 USD
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$ 25.99 USD
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This is the return hose that attaches from the water pump to the radiator

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T#:592009
Part#: 17127563852
Back Ordered
$ 39.99 USD
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$ 39.99 USD
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Connects the transmission heat exchange to the coolant return line
Rein - Corporate Logo
T#:46616005
Part#: EPK0151
Ships in 3 Business Days
$ 100.99 USD
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Replace your damaged expansion tank to prevent coolant loss or potential overheating issues. his item fits the following BMW Chassis: F01,F02,F06,F10,F12,F13 Fits BMW Engines including: N54,N55,N57N
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T#:46616009
Part#: EPK0013
Back Ordered
$ 71.99 USD
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The coolant expansion tank in your vehicle gives additional fluid a place to go after expansion and contraction from temperature change. Because it is subjected to such drastic changes on a regular basis, it can often crack or break. You want to keep all the coolant in your vehicle in the cooling system. If your tank has experienced damage such as cracking, nipples breaking off, or mounting point damage, you will need to replace it. This replacement will fit perfectly and provide the same heating and cooling characteristics as an original unit. When replacing, be sure to have some extra coolant. Check ECS Tuning's website for a wide variety of coolants specifically designed for your car. Most German vehicles require specialized coolant. Be sure to pick up the proper coolant when refilling to avoid damage or premature corrosion.
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Rein - Corporate Logo
T#:46616014
Part#: EPK0012
Back Ordered
$ 29.99 USD
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The coolant expansion tank provides a place for excess fluid as coolant expands and contracts with temperature changes. Constant exposure to these extremes can cause the tank to crack, break, or suffer damage to its nipples or mounting points. To keep your cooling system sealed and functioning properly, any damaged tank should be replaced.
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T#:46616007
Part#: EPK0131
Ships in 3 Business Days
$ 104.99 USD
Free Shipping on orders $49 and up
The coolant expansion tank provides a place for excess coolant to flow as temperatures rise and fall. Because it constantly endures extreme temperature changes, it’s prone to cracking or breaking over time. Keeping coolant contained within the system is essential, so if your tank shows signs of damage—such as cracks, broken nipples, or compromised mounting points—it’s time for a replacement.
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T#:46719180
Part#: CHK0376R
Back Ordered
New Item
$ 43.99 USD
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Keep your cooling system sealed, strong, and ready for anything with this Rein radiator hose kit—your all-in-one fix for cracked, leaking, or worn factory hoses. Years of heat, pressure, and age can cause rubber to weaken, split, or swell, setting the stage for coolant leaks and potential overheating. Rein hoses are engineered to meet or exceed OEM standards, built from premium, heat-resistant materials that can take on extreme temperatures and system pressures without faltering. Each hose features factory-correct bends, fittings, and diameters for an exact, hassle-free installation—no cutting or forcing required. Whether you’re tackling a full cooling system refresh or chasing down a small coolant leak, this Rein kit provides everything needed to restore confidence and performance under the hood. Why choose this Rein radiator hose kit: Factory-level precision – Direct-fit replacements that deliver OEM-quality reliability. Built to last – Resists cracking, swelling, and chemical damage from daily heat cycling. Confidence restored – Prevents coolant loss, overheating, and on-road breakdowns. All-in-one upgrade – Includes upper and lower hoses for a complete system refresh. If keeping your BMW’s cooling system running tight and trouble-free is the goal, Rein brings the dependable quality and fitment you can count on—engineered to perform just like factory, mile after mile.
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T#:591872
Part#: 11537565433
In Stock
$ 47.99

This product was last offered at the strikethrough price on
02-26-2026

$ 30.99 USD
Free Shipping on orders $49 and up
$ 30.99 USD
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Coolant Line for MINI Turbo

Ensure optimal cooling for your MINI's turbo with this essential coolant line, connecting from the auxiliary water pump. Designed to cool the turbo effectively, this critical component features a metal loop hole end for a secure connection to the hollow bolt. Replace your coolant line to maintain proper turbo function and prevent overheating issues.

Benefits:

  • Ensures proper cooling for the turbo
  • Critical component for turbo performance
  • Metal loop hole end for secure connection
  • Prevents overheating issues
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Rein - Corporate Logo
T#:591871
Part#: 11537565432
In Stock
$ 28.99 USD
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Rein - Corporate Logo
T#:599051
Part#: 11537589713
In Stock
$ 27.99 USD
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Rein - Corporate Logo
T#:22295082
Part#: 17127518503
In Stock
$ 78.99 USD
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$ 78.99 USD
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Double tube comes mounted together.

For manual transmissions.

Rein - Corporate Logo
T#:388723
Part#: 17137823626
In Stock
$ 78.99 USD
Free Shipping
$ 78.99 USD
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Mounts towards the front of the engine bay

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T#:592165
Part#: 17122754231
Ships in 1 Business Day
$ 12.99 USD
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Rein - Corporate Logo
T#:29732515
Part#: 17121475574
In Stock
$ 20.99 USD
Free Shipping on orders $49 and up
$ 20.99 USD
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Lower Radiator Hose CHR0926 is a premium replacement part designed to ensure the efficient operation of your vehicle's cooling system. Specifically crafted for a perfect fit, this durable hose ensures the proper flow of coolant between the radiator and engine, preventing overheating and maintaining optimal engine performance. Constructed from durable materials, the Lower Radiator Hose CHR0926 offers excellent heat resistance and long-lasting reliability, making it an ideal solution for any vehicle.

Available at Turner Motorsport, this radiator hose is engineered for easy installation and guarantees a direct fit for seamless compatibility with various vehicle models. Whether you're maintaining or upgrading your cooling system, the Lower Radiator Hose CHR0926 is essential for optimal performance and durability.

  • Precision-engineered for a direct fit
  • Reinforced materials for durability and heat resistance
  • Prevents overheating by ensuring proper coolant flow
  • Designed to withstand high temperatures and pressures
  • Easy installation for hassle-free replacement
  • Available at Turner Motorsport, trusted for quality automotive parts

Upgrade your vehicle’s cooling system with the Lower Radiator Hose CHR0926 for reliable performance and enhanced engine longevity.

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Rein - Corporate Logo
T#:592183
Part#: 17127515501
In Stock
$ 12.99 USD
Free Shipping on orders $49 and up
$ 12.99 USD
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Rein - Corporate Logo
T#:592162
Part#: 17122754221
In Stock
$ 32.29

This product was last offered at the strikethrough price on
06-29-2026

$ 30.99 USD
Free Shipping on orders $49 and up
$ 30.99 USD
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Rein - Corporate Logo
T#:557631
Part#: 17122754222
Ships in 3 Business Days
$ 58.99 USD
Free Shipping
$ 58.99 USD
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Rein - Corporate Logo
T#:592179
Part#: 17127515500
In Stock
$ 7.71 USD
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$ 7.71 USD
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