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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 Aluminum Coolant Hose Flange - E82, E88, E90, E91, E92, E93 ...
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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.
OEM Rein Aluminum Coolant Flange Connector - BMW & MINI B36 B46/B...
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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.
Upper Radiator Hose - E9x E82 E89 With N52 Engine
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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 Coolant Hose - Upper - F22, F23, F30, F32, F33, F34, F36, F87 ...
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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 Upper Radiator Hose - E82, E88, E90, E92, E93, Z4
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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
Radiator Hose for N52 / N54 - Lower
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T#:388683
Part#: 17127564478
In Stock
$ 33.99 USD
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$ 33.99 USD
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Replace split, hard, or bulging hoses

Rein Coolant Hose Metal Connector With Sensor - BMW F22/23 F3X B58 Ge...
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T#:38789910
Part#: CHK0940
In Stock
$ 73.99 USD
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$ 73.99 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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OEM Rein Upper Radiator Hose - E46 M3
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T#:2306
Part#: 11537830716
In Stock
$ 33.99

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

$ 22.99 USD
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$ 22.99 USD
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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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OEM Rein Aluminum Coolant Flange - BMW M57 3.0L
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T#:45791752
Part#: 11127806196
In Stock
$ 69.99

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

$ 58.99 USD
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$ 58.99 USD
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Plastic coolant flanges become brittle over time, leading to cracks and coolant leaks. Upgrade to an aluminum flange to avoid this issue altogether!

Rein Water Pipe - E82, E88, E90, E91, E92, E93
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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 Radiator Hose - Upper - E46
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T#:379786
Part#: 17127510952
In Stock
$ 25.99

This product was last offered at the strikethrough price on
02-09-2026

$ 25.09 USD
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$ 25.09 USD
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A common source of cooling system failure
BMW M52 M54 Water Pipe
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T#:594294
Part#: 11537502525
In Stock
$ 55.99 USD
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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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OEM Rein Upper Radiator Hose - E9X M3
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T#:402115
Part#: 11537838214
In Stock
$ 31.99 USD
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Replace your cracked or leaking radiator hose to prevent further leaks and potentially catastrophic failure.
Heater Inlet Pipe
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T#:594330
Part#: 11531705210
In Stock
$ 40.99 USD
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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 Coolant Hose Aluminum Connector - BMW F22/23 F3X B58 Gen1 ...
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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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OEM Rein Lower Radiator Hose - E9X M3
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T#:387713
Part#: 11537840661
In Stock
$ 49.99 USD
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Replace your cracked or leaking radiator hose to prevent further leaks and potentially catastrophic failure.

Rein Radiator Hose - Lower - E46
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T#:379779
Part#: 11531436408
In Stock
$ 31.99 USD
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A common source of cooling system failure
BMW E9X Z4 E8X Coolant Expansion Tank
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T#:402142
Part#: 17137640514
In Stock
$ 75.99

This product was last offered at the strikethrough price on
12-12-2025

$ 70.99 USD
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$ 70.99 USD
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Includes level sensor

Rein Radiator Hose - Lower - Z3
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T#:363452
Part#: 11531716642
In Stock
$ 39.99

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

$ 28.99 USD
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$ 28.99 USD
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A common source of cooling system failure
OEM Rein Lower Radiator Hose - E46 M3
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T#:2674
Part#: 11537830715
In Stock
$ 23.99 USD
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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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OEM Rein Expansion Tank Hose - E46 3-Series
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T#:363453
Part#: 64218376153
Ships in 1 day
$ 82.99

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

$ 80.99 USD
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$ 80.99 USD
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Expansion tank to heater core

OEM Rein Expansion Tank Vent Hose - E82/8 E9X N52
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T#:402113
Part#: 17127618510
In Stock
$ 32.99 USD
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Acts as a vent hose between the upper radiator hose and the expansion tank. Runs the length of the top of the radiator.
Rein Radiator Hose - Upper - Z3
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T#:363438
Part#: 11531716641
In Stock
$ 29.99 USD
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Connects the radiator to the water pump
CRP Radiator Vent Hose - E82, E84, E88, E90, E92, E93
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T#:1195859
Part#: 17127565094
Back Ordered
$ 34.99 USD
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$ 34.99 USD
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Located on the top of the radiator


Rein Coolant Hose - E82, E84, E88, E90, E92, E93
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T#:592013
Part#: 17127599450
In Stock
$ 57.99 USD
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$ 57.99 USD
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Connects your radiator to the thermostat
Rein Radiator Hose with Temerature Sensor Fitting - E82 E88 E90 E91 E...
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T#:583051
Part#: 17127531581
In Stock
$ 27.99 USD
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$ 27.99 USD
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Radiator to Thermostat Housing
Coolant Expansion Tank
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T#:592020
Part#: 17137640515
In Stock
$ 97.99 USD
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$ 97.99 USD
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Includes level sensor

E46 M3 Radiator Hose - Upper And Lower
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T#:20617632
Part#: 11537830715KT
Ships on Sep 23, 2026
$ 53.98 USD
Free Shipping on orders $49 and up

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 Turbocharger Coolant Return Line - BMW F10 F06/12/13 S63 4.4L En...
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T#:39059269
Part#: 11538092641
Ships in 3 Business Days
$ 71.99 USD
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Replace your leaking turbo coolant line to prevent further leaks, coolant loss, and overheating.
Rein Lower Radiator Hose - E82, E88, E90, E92, E93
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T#:340665
Part#: 17127564480
In Stock
$ 50.99 USD
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The hose that attaches to the bottom of the radiator

Rein- Radiator Hose - F36 430i,F31 330i, F22 230i
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T#:33946936
Part#: 17128616528
Ships in 1 Business Day
$ 76.99 USD
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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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Coolant Return Hose - N55
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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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Coolant Hose - Supply N14 N18 1.6L Engine
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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
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$ 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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OEM Rein Coolant Hose - BMW E82/88 E9X N54 N55 3.0L
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T#:592007
Part#: 17127548203
In Stock
$ 26.99 USD
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Low temperature cooling module hose.
OEM Rein Coolant Hose - F07/10 F22/3 F3X N20
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T#:402116
Part#: 11538645481
In Stock
$ 23.99 USD
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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.
Water Hose
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T#:591871
Part#: 11537565432
In Stock
$ 28.99 USD
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OEM Rein Lower Coolant Hose - N63 4.4L
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T#:554681
Part#: 17127575427
Ships in 3 Business Days
$ 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

OEM Coolant Return Pipe from Water Pump Hose to Transmission Cooler T...
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T#:6945
Part#: 11531711384
Ships in 3 Business Days
$ 68.99 USD
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$ 68.99 USD
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This is the cooling system return hose that goes from the automatic transmission cooling thermostat to the hose that comes off the lower water pump outlet.1999-2003 E39 BMW 540i
1999-2001 E38 BMW 740i 740il
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E39 Upper Radiator Hose - E39 525i 528i 530i
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T#:4473
Part#: 11531705223
Ships in 1 day
$ 45.99 USD
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This cooling hose goes from the upper radiator port to the water pump. It includes a new bleed screw.

This item fits the following BMWs:
1999-2003 E39 BMW 525i 528i 530i
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Rein Coolant Expansion Tank - E46, E53, E83
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T#:402141
Part#: 17117573781
In Stock
$ 76.39 USD
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$ 76.39 USD
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Includes cap and level sensor

Upper Radiator Coolant Hose
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T#:594378
Part#: 17127619684
In Stock
$ 68.56

This product was last offered at the strikethrough price on
05-22-2026

$ 61.99 USD
Free Shipping on orders $49 and up
$ 61.99 USD
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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.
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OEM Rein Heater Core, Expansion Tank, Throttle Body Coolant Hose - E3...
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T#:6965
Part#: 11531738053
Ships in 3 Business Days
$ 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 Radiator Hose - Lower - Z4
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T#:402423
Part#: 17127514405
In Stock
$ 29.99 USD
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$ 29.99 USD
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Keep your cooling system leak free
Rein Thermostat - 88�C - E30, E34, E36, Z3
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T#:591800
Part#: 11537511580
Ships in 3 Business Days
$ 37.99 USD
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Common point of failure in the cooling system.

Expansion Tank Hose
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T#:375747
Part#: 11531438632
Ships in 1 Business Day
$ 24.99 USD
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OEM Rein Coolant Hose - E38 E39 M62 4.4L
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T#:375752
Part#: 11537511207
In Stock at Vendor
$ 25.57 USD
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$ 25.57 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 Water Hose With Gasket - Water Pump To Engine Inlet
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T#:17804808
Part#: 11537584630R
Ships in 1 Business Day
$ 40.99 USD
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Rein OE quality water hoses are designed to be direct replacements for OE hoses and assemblies. This includes the hose and clamps.
OEM Rein Vent Hose - N63 4.4L
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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



Rein Radiator Hose - Lower - E39
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T#:341242
Part#: 11531705224
Ships in 1 Business Day
$ 37.99 USD
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$ 37.99 USD
Free Shipping on orders $49 and up
Includes retaining clips
Rein Coolant Hose - Water Valve - Z3
affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms
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T#:379696
Part#: 64218400295
Ships in 3 Business Days
$ 27.99 USD
Free Shipping on orders $49 and up
$ 27.99 USD
Free Shipping on orders $49 and up
Return hose for the underhood coolant valve