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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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Module Bracket
Module Bracket
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T#:639804
Part#: 17117575247
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This is the left side radiator bracket.
OEM Rein Coolant Hose w/ Temperature Sensor - BMW E60 E63/E64 E65/E66
OEM Rein Coolant Hose w/ Temperature Sensor - BMW E60 E63/E64 E65/E66...
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T#:375746
Part#: 17127508011
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This hose runs from the lower radiator port on the passenger side of the radiator to the water pump on the engine. Rubber hoses can crack over time, leading to coolant loss. Replace your hose with this OEM Rein hose to eliminate leaks and prevent overheating.
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Rein Water Hose Problem Solver Kit - F chassis N55
Rein Water Hose Problem Solver Kit - F chassis N55
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T#:53750119
Part#: 11537598237
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Rein's Rubber Elbow Problem Solver Kit for the Coolant Feed Hose Replaces the Rubber End of the Hard Feed Line Without Having to Move the Exhaust or Replace the Entire Hard Line
Radiator Hose Lower
Radiator Hose Lower
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T#:592175
Part#: 17127515489
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OEM Rein Oil Cooler Coolant Hose - E70 X5 xDrive30i
OEM Rein Oil Cooler Coolant Hose - E70 X5 xDrive30i
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T#:583589
Part#: 11537609944
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Coolant hose that runs from the inlet to thermostat. 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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BMW Expansion Tank With Cap - 17107514964
BMW Expansion Tank With Cap - 17107514964
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T#:46616026
Part#: EPK0025
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The coolant expansion tank provides a place for excess coolant to flow as temperatures rise and fall. Because it’s exposed to constant heat cycles and pressure changes, it can eventually crack, split, or suffer damage to its nipples or mounting points. Keeping coolant properly contained within the system is essential, so if your tank shows signs of wear or damage, replacement is necessary. This direct-fit replacement installs easily and delivers the same heating and cooling performance as the factory unit. When replacing the tank, be sure to have additional coolant on hand. ECS Tuning carries a full range of vehicle-specific coolants designed to meet OEM specifications. Most German vehicles require specialized formulas—using the correct coolant will help prevent corrosion and ensure long-term reliability.
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Cooling Hose
Cooling Hose
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T#:594371
Part#: 17127582894
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$ 56.99 USD
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Replacement cooling hose from Rein
Turbocharger Coolant Return Line
Turbocharger Coolant Return Line
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T#:4826913
Part#: 11538485578
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$ 66.99 USD
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Cylinder 1-4 Turbo Return Line. Keep your turbos healthy and lubricated. Rein quality replacement turbo return line.
Rein Engine Coolant Hose - Upper Radiator To Expansion Tank - BMW G3X 5, 6, 7 ser.
Rein Engine Coolant Hose - Upper Radiator To Expansion Tank - BMW G3X...
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T#:52903294
Part#: 17129844478
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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.
BMW Radiator Hose Kit - 17127509963
BMW Radiator Hose Kit - 17127509963
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T#:46719193
Part#: CHK0032P
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$ 76.99 USD
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$ 76.99 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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OEM Rein Coolant Line - E38
OEM Rein Coolant Line - E38
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T#:379758
Part#: 64218377662
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$ 15.99 USD
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Runs from the right heater core 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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Expansion Tank Vent Hose
Expansion Tank Vent Hose
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T#:379672
Part#: 17127508013
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$ 60.99 USD
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$ 60.99 USD
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A commonly leaking hose
OEM Rein Coolant Hose - E30
OEM Rein Coolant Hose - E30
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T#:379799
Part#: 13541719967
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$ 14.06 USD
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Fix that leak or replace that old line with this OE replacement!
OEM Rein Coolant Expansion Tank Overflow Hose - BMW G30 530e, G12 740i
OEM Rein Coolant Expansion Tank Overflow Hose - BMW G30 530e, G12 740...
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T#:45757471
Part#: 17125A02485
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$ 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.
BMW Radiator Hose Kit - 17127521778
BMW Radiator Hose Kit - 17127521778
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T#:46719168
Part#: CHK0401R
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$ 52.99 USD
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$ 52.99 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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Rein Radiator Hose G01 X3 30i, G02 X4 30i
Rein Radiator Hose G01 X3 30i, G02 X4 30i
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T#:33913472
Part#: 17127535531
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$ 52.99 USD
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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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Upper Radiator Hose
Upper Radiator Hose
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T#:592179
Part#: 17127515500
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$ 7.71 USD
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$ 7.71 USD
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Rein Water Hose with Metal Flange - E60, E61 - N54
Rein Water Hose with Metal Flange - E60, E61 - N54
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T#:53750141
Part#: CHU0460
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Heat cycles cause Cracking and Leaks on Rubber and Plastic Components. Replace Leaking Hose with this Part From Rein Featuring Upgraded Metal Flanges
Rein Radiator Mount
Rein Radiator Mount
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T#:17804812
Part#: 17117575248
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$ 13.99 USD
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$ 13.99 USD
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Rein OE equivalent mounts are produced with high-quality materials to ensure maximum life and a smooth ride.
Water Hose With O-Ring - Cylinder Head To Thermostat Housing
Water Hose With O-Ring - Cylinder Head To Thermostat Housing ...
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T#:594303
Part#: 11537585023
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$ 30.11 USD
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$ 30.11 USD
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Replacement Water Hose from Rein
Upper Radiator Hose
Upper Radiator Hose
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T#:38161723
Part#: 17127811127
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$ 43.99 USD
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$ 43.99 USD
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OEM Rein Cooling Hose - E10 1602, E10 2002tii
OEM Rein Cooling Hose - E10 1602, E10 2002tii
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T#:34214794
Part#: 11531266469
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$ 14.99 USD
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$ 14.99 USD
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Cooling Hose - CHR0915 by Rein is a premium replacement hose designed to deliver superior durability and performance. Manufactured by Rein Automotive, this cooling hose is engineered to meet or exceed OEM specifications, ensuring a perfect fit for a wide range of European vehicles. Ideal for preventing coolant leaks, overheating, and maintaining optimal engine temperature, the Cooling Hose - CHR0915 is a reliable solution for your vehicle's cooling system.

  • Direct-fit replacement for seamless installation
  • Engineered for durability and reliability
  • Reinforced construction for high-temperature resistance
  • Perfect for your classic BMW vehicles
  • Helps prevent coolant leaks and overheating

This cooling hose is a direct-fit replacement and comes with a reinforced design to withstand extreme temperatures and pressure fluctuations. It's an excellent choice for car enthusiasts and mechanics looking for high-quality, long-lasting parts. Turner Motorsport offers this premium hose, ensuring that your vehicle's cooling system performs at its best.

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Coolant Hose - Supply Line
Coolant Hose - Supply Line
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T#:379708
Part#: 17127521777
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$ 41.99 USD
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Connects from water pump to top left of radiator
Upper Radiator Hose
Upper Radiator Hose
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T#:3136231
Part#: 17129800479
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$ 33.99 USD
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$ 33.99 USD
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OEM Rein Radiator Cap - E21 E24 E10 E12 E23 E28
OEM Rein Radiator Cap - E21 E24 E10 E12 E23 E28
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T#:7395
Part#: 17111100848
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$ 11.99 USD
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$ 11.99 USD
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The radiator tank cap keeps necessary pressure on your coolant to increase efficiency. If you have an overheating issue in your vehicle, a simple, quick, and inexpensive part to replace is this cap. Often times, the coolant is not kept under enough pressure to keep it from boiling or expanding too much. This cap keeps all the heat and liquid inside the coolant system for maximum efficiency. Should be replaced each time major coolant system service is performed.
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Coolant hose
Coolant hose
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T#:592665
Part#: 64218391121
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$ 14.99 USD
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$ 14.99 USD
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OEM Rein Coolant Supply Hose - BMW E60 525i 530i M54
OEM Rein Coolant Supply Hose - BMW E60 525i 530i M54
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T#:340691
Part#: 17127519255
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$ 66.28 USD
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$ 66.28 USD
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Attaches between upper radiator connection radiator and the thermostat housing
OEM Rein Heater Core Return Hose - E36 318 M42/44
OEM Rein Heater Core Return Hose - E36 318 M42/44
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T#:11079
Part#: 64211387010
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$ 6.11 USD
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Runs from the water valve to the engine. 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:
BMW 3 Series - 318i, 318i Convertible, 318is, 318ti

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OEM Rein Water Pump W/ Installation Kit - BMW E82/88 E9X N52 3.0L
OEM Rein Water Pump W/ Installation Kit - BMW E82/88 E9X N52 3.0L ...
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T#:45997535
Part#: WPS0502
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$ 811.99 USD
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$ 811.99 USD
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Rein Electric Water Pump Replacement Kits offer a valuable solution to failure-prone cooling-related components on the N52 BMW engine platforms. At the heart of these kits are OEM electric water pumps, which are complemented by Rein's problem solver hoses.
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BMW Water Pump Kit - E9X/E8X N54/55
BMW Water Pump Kit - E9X/E8X N54/55
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T#:46616001
Part#: WPS0505
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$ 944.99 USD
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$ 944.99 USD
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Late-model external water pumps are typically more dependable and easier to service, with no gasket or O-ring to worry about. Replacing higher-mileage units during routine cooling system maintenance is a smart way to add extra peace of mind. Includes: Water pump Thermostat assembly Water pump elbow Coolant hoses Necessary hardware
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OEM Rein Coolant Hose - BMW E60 E63/E64 E65/E66
OEM Rein Coolant Hose - BMW E60 E63/E64 E65/E66
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T#:45791754
Part#: 17127508011R
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$ 35.99 USD
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$ 35.99 USD
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This hose runs from the lower radiator port on the passenger side of the radiator to the water pump on the engine. Rubber hoses can crack over time, leading to coolant loss. Replace your hose with this OEM Rein hose to eliminate leaks and prevent overheating.
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Rein Water Pump Service Kit - N20
Rein Water Pump Service Kit - N20
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T#:14023856
Part#: 11518635089-3
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$ 898.99 USD
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$ 898.99 USD
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Kits include: water pump thermostat assembly head to thermostat hose w/ aluminum flange WP to engine hose WP to thermostat hose all necessary clamps and hardware This Rein water pump service kit addresses common coolant hose plastic flange failure and ensures that the water pump replacement repair is done right the first time. The water pump and thermostat are OEM Use of OE or Pentosin NF-G11 coolant is recommended
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Expansion Tank With Cap
Expansion Tank With Cap
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T#:46616025
Part#: EPK0138
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$ 71.99 USD
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The coolant expansion tank allows excess coolant to flow in and out as temperatures rise and fall. Over time, repeated exposure to extreme temperature changes can cause the tank to crack, split, or break. To keep your cooling system sealed and functioning properly, any tank showing signs of damage—such as cracks, broken nipples, or compromised mounting points—should be replaced.
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Upper Radiator Hose
Upper Radiator Hose
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T#:592162
Part#: 17122754221
In Stock
$ 32.29

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

$ 30.99 USD
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$ 30.99 USD
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Rein Coolant Expansion Tank - E65, E66
Rein Coolant Expansion Tank - E65, E66
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T#:593077
Part#: 17137647713
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$ 99.99 USD
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$ 99.99 USD
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Replace your cracked or faded tank
OEM Rein Coolant Hose - E36 Z3
OEM Rein Coolant Hose - E36 Z3
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T#:379763
Part#: 11531743295
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$ 13.99 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.
Coolant Hose
Coolant Hose
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T#:592158
Part#: 17122754219
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$ 14.99 USD
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Rein Water Hose (Right Outlet) - E32 E34
Rein Water Hose (Right Outlet) - E32 E34
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T#:593082
Part#: 17221728944
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$ 28.99 USD
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$ 28.99 USD
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Transmission Oil Cooler to Water Manifold
OEM Rein Upper Radiator Hose - E39 528i (up to 09/1998)
OEM Rein Upper Radiator Hose - E39 528i (up to 09/1998)
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T#:349033
Part#: 11531740832
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$ 17.99 USD
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$ 17.99 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.
Coolant Hose from Expansion Tank - E36
Coolant Hose from Expansion Tank - E36
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T#:6964
Part#: 11531730351
Ships in 1 Business Day
$ 18.79 USD
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$ 18.79 USD
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This coolant hose connects the water hose part #11531738053 to the radiator coolant expansion tank.Fits E36 3 series with M50, S50 or S52 engine.

This item fits the following BMWs:
1992-1998 E36 BMW 325i 325is 325ic M3
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Water Hose
Water Hose
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T#:594317
Part#: 17127560974
Ships in 3 Business Days
$ 37.99 USD
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$ 37.99 USD
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Radiator to Auto Trans Oil Cooler
OEM Rein Cooling Hose - E36, Z3
OEM Rein Cooling Hose - E36, Z3
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T#:362532
Part#: 13541703865
In Stock at Vendor
$ 19.83

This product was last offered at the strikethrough price on
05-02-2026

$ 18.99 USD
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$ 18.99 USD
Free Shipping on orders $49 and up
Add to Wish List
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.
Pump To Radiator Hose Upper
Pump To Radiator Hose Upper
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T#:592187
Part#: 17127515989
Ships in 3 Business Days
$ 18.99 USD
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$ 18.99 USD
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BMW Radiator Hose Kit - 17127531581
BMW Radiator Hose Kit - 17127531581
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T#:46719188
Part#: CHK0462
Ships in 3 Business Days
$ 43.99 USD
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$ 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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Rein Coolant Expansion Tank - E70
Rein Coolant Expansion Tank - E70
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T#:592023
Part#: 17137647290
Ships in 3 Business Days
$ 85.99 USD
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$ 85.99 USD
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Plastic expansion tanks have a limited lifespan - replace every 80,000 miles
BMW Radiator Hose Kit - 17123413819
BMW Radiator Hose Kit - 17123413819
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Rein - Corporate Logo
T#:46719171
Part#: CHK0198
Ships in 3 Business Days
$ 49.99 USD
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$ 49.99 USD
Free Shipping on orders $49 and up
Add to Wish List
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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OEM Rein Cylinder Head To Expansion Tank Coolant Hose - E53 X5 N62 4.4L 4.8L
OEM Rein Cylinder Head To Expansion Tank Coolant Hose - E53 X5 N62 4....
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T#:379756
Part#: 17127509967
Ships in 3 Business Days
$ 38.99 USD
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$ 38.99 USD
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Replace your cracked or leaking radiator hose to prevent further leaks and potentially catastrophic failure.

Fits the following BMWs:
2003+ E53 BMW X5 N62 4.4L 4.8L

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Rein Coolant Return line - E38
Rein Coolant Return line - E38
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T#:591958
Part#: 17111737708
Ships in 3 Business Days
$ 9.17

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

$ 9.06 USD
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$ 9.06 USD
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From expansion tank to radiator
Upper Radiator Hose - Short Section
Upper Radiator Hose - Short Section
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T#:592156
Part#: 17122754203
Ships in 3 Business Days
$ 14.99 USD
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$ 14.99 USD
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OEM Rein Lower Radiator Hose - E34 525i
OEM Rein Lower Radiator Hose - E34 525i
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T#:6962
Part#: 11531722852
Ships in 1 Business Day
$ 12.99 USD
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$ 12.99 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.

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