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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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Rein - Corporate Logo
T#:593535
Part#: CHC0609
In Stock
$ 36.06 USD
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Made from high-strength aluminum vs the OEM plastic prone to failure.
Rein - Corporate Logo
T#:2253
Part#: 11510392553
In Stock
$ 7.13 USD
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These aluminum water pump screws are single use and must be replaced each time they are removed. These are used on all 325i, 328i, and 330i with the BMW N51 N52 and N53 engines. They were also used on some early N54 engines that have rubber mounts on the water pump housing. Do not use these bolts if your N54 water pump has been replaced with a housing that does not have the rubber mounts.

In German, Rein means Pure. In the automotive industry the Rein name has quickly come to represent quality. With fitments for some of the world’s finest automobiles including BMW and Mini and guaranteed OE quality, Rein is a name you can trust.

This item fits the following BMWs:
2008+ E82 BMW 128i 135i
2007+ E9X BMW 325i 325xi 328i 328xi 330i 335i 335xi
2006+ E60 BMW 525i 525xi 528i 528xi 530i 530xi 535i 535xi
2006+ X3 BMW X3 3.0i X3 3.0si
2006+ Z4 BMW Z4 3.0i Z4 3.0si
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Rein - Corporate Logo
T#:7460
Part#: 17127531579
In Stock
$ 44.99 USD
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This is the upper radiator hose that goes from the engine to the top of the radiator with either N51 or N52 enigne.

This item fits the following BMWs:
2008+ E82 BMW 128i
2006-2011 E90 BMW 325i 325xi 328i 328xi 328i xDrive 330i 330xi - Sedan
2006-2012 E91 BMW 325xi 328i 328xi 328i xDrive - Wagon
2007-2013 E92 BMW 328i 328xi 328i xDrive - Coupe
2007-2013 E93 BMW 328i Convertible
2009+ Z4 BMW Z4 sDrive30i
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Rein - Corporate Logo
T#:33679696
Part#: 11118511205
In Stock
$ 50.99 USD
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$ 50.99 USD
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Plastic coolant flanges become brittle over time, which can cause them to crack and fail. Prevent overheating and coolant loss with this OEM Rein upgraded aluminum coolant flange.

Rein - Corporate Logo
T#:568810
Part#: 17127604542
In Stock
$ 45.99 USD
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This hose goes from the radiator to the oil cooler. After years of use and exposure to heat, the hoses in your car can dry up and crack, resulting in nasty leaks - or worse. Replace your rotted, leaking hoses before they lead to larger problems.
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Rein - Corporate Logo
T#:38789910
Part#: CHK0940
In Stock
$ 73.99 USD
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$ 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 - Corporate Logo
T#:340690
Part#: 17127540127
In Stock
$ 40.99 USD
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The hose that comes off of the top outlet on the radiator
Rein - Corporate Logo
T#:388683
Part#: 17127564478
In Stock
$ 33.99 USD
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$ 33.99 USD
Free Shipping on orders $49 and up
Replace split, hard, or bulging hoses

Rein - Corporate Logo
T#:362446
Part#: 11531710048
In Stock
$ 4.07 USD
Free Shipping on orders $49 and up
Seals the rear of the water transfer pipe to the block

Rein - Corporate Logo
T#:2306
Part#: 11537830716
In Stock
$ 33.99

This product was last offered at the strikethrough price on
05-06-2026

$ 22.99 USD
Free Shipping on orders $49 and up
$ 22.99 USD
Free Shipping on orders $49 and up

Replace your cracked or leaking radiator hose to prevent further leaks and potentially catastrophic failure. This hose replaces the Upper radiator hose that connects the thermostat housing to the radiator.

This Upper Radiator Hose fits the following BMWs:
2001-2006 E46 3 Series M3, M3 Convertible

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Rein - Corporate Logo
T#:45791752
Part#: 11127806196
In Stock
$ 69.99

This product was last offered at the strikethrough price on
03-08-2026

$ 58.99 USD
Free Shipping on orders $49 and up
$ 58.99 USD
Free Shipping on orders $49 and up
Plastic coolant flanges become brittle over time, leading to cracks and coolant leaks. Upgrade to an aluminum flange to avoid this issue altogether!
Rein - Corporate Logo
T#:379786
Part#: 17127510952
In Stock
$ 25.09

This product was last offered at the strikethrough price on
06-22-2026

$ 24.95 USD
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$ 24.95 USD
Free Shipping on orders $49 and up
A common source of cooling system failure


Rein - Corporate Logo
T#:403979
Part#: 11537545890
In Stock
$ 20.99 USD
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Connects from the top of the thermostat housing to the engine block
Rein - Corporate Logo
T#:594294
Part#: 11537502525
In Stock
$ 55.99 USD
Free Shipping on orders $49 and up

BMW M52 M54 Water Pipe is an essential replacement part designed to ensure long-term reliability and optimal performance for your BMW's cooling system. Engineered to replace cracked or broken coolant pipes, this high-quality water pipe from Turner Motorsport guarantees a perfect fit and dependable service. Investing in this replacement pipe helps prevent overheating and potential engine damage, maintaining your vehicle's performance and longevity.

  • Reliable replacement: Designed to replace cracked or broken coolant pipes for improved engine cooling.
  • Optimal fitment: Engineered to ensure a perfect fit and seamless installation.
  • Durable construction: Built with high-quality materials to withstand engine temperatures and environmental conditions.
  • Preventative maintenance: Helps avoid overheating and potential engine damage by ensuring a reliable coolant flow.
  • Vehicle compatibility: Specifically designed for BMW M52 and M54 engine models.

Upgrade your BMW’s cooling system with the BMW M52 M54 Water Pipe from Turner Motorsport for enhanced reliability and performance.

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Rein - Corporate Logo
T#:348982
Part#: 11537521049
In Stock
$ 17.99 USD
Free Shipping on orders $49 and up
Connects from the water pump to the thermostat

Rein - Corporate Logo
T#:14593
Part#: 11531740649
In Stock
$ 30.99

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

$ 18.99 USD
Free Shipping on orders $49 and up
$ 18.99 USD
Free Shipping on orders $49 and up
This is the radiator expansion tank return hose for the cooling system on E36 models with the M52 or S52 engine. This hose goes from the expansion tank to the main coolant return pipe.

This item fits the following BMWs:
1996-1998 E36 BMW 323is 323ic 328i 328is 328ic M3
1996-1998 Z3 BMW Z3 2.8
1998-2000 Z3 BMW M Roadster M Coupe
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Rein - Corporate Logo
T#:402115
Part#: 11537838214
In Stock
$ 31.99 USD
Free Shipping on orders $49 and up
Replace your cracked or leaking radiator hose to prevent further leaks and potentially catastrophic failure.
Rein - Corporate Logo
T#:2674
Part#: 11537830715
In Stock
$ 23.99 USD
Free Shipping on orders $49 and up

Replace your cracked or leaking radiator hose to prevent further leaks and potentially catastrophic failure. This hose replaces the lower radiator hose that connects the radiator to the thermostat housing.

This Lower Radiator Hose fits the following BMWs:
2001-2006 E46 3 Series M3, M3 Convertible

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Rein - Corporate Logo
T#:594330
Part#: 11531705210
In Stock
$ 42.39 USD
Free Shipping on orders $49 and up
This is the plastic heater inlet pipe that connects the cylinder head to the heater inlet on cars with the M52 or M54 engine.The plastic on this hose becomes brittle over time and eventually leads to failure.
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Rein - Corporate Logo
T#:363452
Part#: 11531716642
In Stock
$ 39.99

This product was last offered at the strikethrough price on
05-04-2026

$ 28.99 USD
Free Shipping on orders $49 and up
$ 28.99 USD
Free Shipping on orders $49 and up
A common source of cooling system failure

Rein - Corporate Logo
T#:1299
Part#: 11531708499
In Stock at Vendor
$ 12.99 USD
Free Shipping on orders $49 and up
This is the coolant hose that connects the upper radiator outlet to the thermostat housing. Any time you are into the cooling system, either for a radiator, water pump, thermostat, etc, you should consider installing fresh new hoses as a preventative measure.

This item fits the following BMWs:
1992-1998 E36 BMW 323is 323ic 325i 325is 325ic 328i 328is 328ic M3
1997-1998 Z3 BMW Z3 2.8
1998-2000 Z3 BMW M Roadster M Coupe with S52 engine
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Rein - Corporate Logo
T#:379779
Part#: 11531436408
In Stock
$ 31.99 USD
Free Shipping on orders $49 and up
A common source of cooling system failure
Rein - Corporate Logo
T#:1195859
Part#: 17127565094
In Stock
$ 34.99 USD
Free Shipping on orders $49 and up
$ 34.99 USD
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Located on the top of the radiator
Rein - Corporate Logo
T#:402142
Part#: 17137640514
In Stock
$ 70.99

This product was last offered at the strikethrough price on
06-22-2026

$ 70.35 USD
Free Shipping
$ 70.35 USD
Free Shipping
Includes level sensor


Rein - Corporate Logo
T#:387713
Part#: 11537840661
Ships in 3 Business Days
$ 49.99 USD
Free Shipping on orders $49 and up
Replace your cracked or leaking radiator hose to prevent further leaks and potentially catastrophic failure.
Rein - Corporate Logo
T#:363438
Part#: 11531716641
In Stock
$ 29.99 USD
Free Shipping on orders $49 and up
Connects the radiator to the water pump
Rein - Corporate Logo
T#:402113
Part#: 17127618510
In Stock
$ 32.99 USD
Free Shipping on orders $49 and up
Acts as a vent hose between the upper radiator hose and the expansion tank. Runs the length of the top of the radiator.

Rein - Corporate Logo
T#:362531
Part#: 64218363198
In Stock
$ 9.58 USD
Free Shipping on orders $49 and up
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#:363453
Part#: 64218376153
In Stock
$ 82.99

This product was last offered at the strikethrough price on
05-06-2026

$ 34.99 USD
Free Shipping on orders $49 and up
$ 34.99 USD
Free Shipping on orders $49 and up
Expansion tank to heater core
Rein - Corporate Logo
T#:592013
Part#: 17127599450
In Stock
$ 58.99 USD
Free Shipping
$ 58.99 USD
Free Shipping
Connects your radiator to the thermostat

Rein - Corporate Logo
T#:592020
Part#: 17137640515
In Stock
$ 97.99 USD
Free Shipping
$ 97.99 USD
Free Shipping
Includes level sensor
Rein - Corporate Logo
T#:348769
Part#: 11531726344
In Stock
$ 15.99

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

$ 13.99 USD
Free Shipping on orders $49 and up
$ 13.99 USD
Free Shipping on orders $49 and up
Replace your radiator hose before a blown hose leaves you stranded.

Rein - Corporate Logo
T#:6917
Part#: 11531287651
In Stock
$ 10.99 USD
Free Shipping on orders $49 and up
Replace your cracked or leaking coolant hose with this radiator coolant hose that goes from the waterpump to the thermostat on cars with the M20 engine. We recommend inspecting cooling system hoses for dry rot / cracks yearly.

This item fits the following BMWs:
1984-1991 E30 BMW 325e 325es 325i 325ic 325is 325ix
1982-1988 E28 BMW 528e
1989-1990 E34 BMW 525i
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Rein - Corporate Logo
T#:583051
Part#: 17127531581
In Stock
$ 27.99 USD
Free Shipping on orders $49 and up
$ 27.99 USD
Free Shipping on orders $49 and up
Radiator to Thermostat Housing
Rein - Corporate Logo
T#:340541
Part#: 17111742231
Ships in 1 Business Day
$ 17.99 USD
Free Shipping on orders $49 and up
This radiator expansion tank cap is used most BMW's from 1991-2006. It is a common failure item. When this item fails, it cannot hold pressure which results in your BMW overheating. If you are overhauling your coolant system, now is the time to consider preventative replacing this cap. It is also referred to as the coolant reservoir cap.
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Rein - Corporate Logo
T#:39059269
Part#: 11538092641
In Stock
$ 71.99 USD
Free Shipping on orders $49 and up
Replace your leaking turbo coolant line to prevent further leaks, coolant loss, and overheating.


Rein - Corporate Logo
T#:33946936
Part#: 17128616528
In Stock
$ 76.99 USD
Free Shipping on orders $49 and up

Rein's durable and flexible construction of their radiator hoses 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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Rein - Corporate Logo
T#:340665
Part#: 17127564480
In Stock
$ 50.99 USD
Free Shipping on orders $49 and up
The hose that attaches to the bottom of the radiator
Rein - Corporate Logo
T#:592007
Part#: 17127548203
Ships in 3 Business Days
$ 26.99 USD
Free Shipping on orders $49 and up
Low temperature cooling module hose.

Rein - Corporate Logo
T#:402116
Part#: 11538645481
In Stock
$ 23.99 USD
Free Shipping on orders $49 and up
Years of use and heat exposure can wear out the hoses on your car. To prevent leaks, you should periodically replace hoses as part of your regular maintenance routine.

Rein - Corporate Logo
T#:388662
Part#: 11537516414
In Stock
$ 19.99 USD
Free Shipping on orders $49 and up

Cooling hoses tend to crack over time after going through countless heating and cooling cycles. This can lead to leaks or air bubbles in the cooling system that lead too coolant loos, hurts cooling potential, or could possibly cause damage from excess heat.

Fits the following BMWs:
Submodels with N52 3.0L engine.

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Rein - Corporate Logo
T#:402141
Part#: 17117573781
In Stock
$ 76.39 USD
Free Shipping
$ 76.39 USD
Free Shipping
Includes cap and level sensor

Rein - Corporate Logo
T#:591955
Part#: 17111712788
In Stock
$ 4.99 USD
Free Shipping on orders $49 and up
Coolant Bleeder Screw is a critical component for maintaining your BMW’s cooling system. Designed to release trapped air from the coolant lines, this screw ensures efficient coolant flow and prevents overheating. Specifically engineered for BMW models, it enhances the overall performance and longevity of your engine by maintaining proper temperature regulation. Comes with O-Ring.
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Rein - Corporate Logo
T#:379680
Part#: 11531710055
In Stock
$ 2.03 USD
Free Shipping on orders $49 and up
When it comes time to replace the water pump, be sure to replace all the O-Rings associated with it to ensure that your car stays leak free. If you are experiencing leaking issues, be sure to inspect these rings, as they might have worn down. This specific ring is used when replacing water pump on cooling pipe to the water accumulator. There are two per car.
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Rein - Corporate Logo
T#:6965
Part#: 11531738053
In Stock
$ 41.99 USD
Free Shipping on orders $49 and up
This is the large "T" shaped heater hose that connects the engine with the radiator expansion tank, heater core and throttle body. Fits E36 3 series with M50 or S50 engine.

This item fits the following BMWs:
1992-1999 E36 BMW 325i 325is 325ic M3
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Rein - Corporate Logo
T#:375748
Part#: 11531438633
Ships in 1 Business Day
$ 18.99 USD
Free Shipping on orders $49 and up
$ 18.99 USD
Free Shipping on orders $49 and up
Runs from the expansion tank to auxiliary water pump
Rein - Corporate Logo
T#:6973
Part#: 11531743535
In Stock
$ 16.99 USD
Free Shipping on orders $49 and up
OEM BMW ENGINE WATER HOSE 11531743535.--

This item fits the following BMWs:
BMW 3 Series - 318i, 318i Convertible, 318is, 318ti
BMW Z Series - Z3 1.9

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Rein - Corporate Logo
T#:594382
Part#: 11531439134
Ships in 3 Business Days
$ 7.76 USD
Free Shipping on orders $49 and up
Replacement Water Pump Blind Plug from Rein


Rein - Corporate Logo
T#:593072
Part#: 17127596841
In Stock
$ 29.88

This product was last offered at the strikethrough price on
05-03-2026

$ 26.99 USD
Limited Qty Sale
Free Shipping on orders $49 and up
$ 29.88

This product was last offered at the strikethrough price on
05-03-2026

$ 26.99 USD
Limited Qty Sale
Free Shipping on orders $49 and up
Rein - Corporate Logo
T#:402117
Part#: 17117524710
In Stock
$ 32.99 USD
Free Shipping on orders $49 and up
$ 32.99 USD
Free Shipping on orders $49 and up
Connects to lower coolant pipe