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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 Water Hose With Metal Flange - F-Chassis - N55
Rein Water Hose With Metal Flange - F-Chassis - N55
Rein - Corporate Logo
T#:53750147
Part#: CHU0632
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$ 52.99 USD
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$ 52.99 USD
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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 Coolant Hose With Metal Flange - E82, E88, E9x - N55
Rein Coolant Hose With Metal Flange - E82, E88, E9x - N55
Rein - Corporate Logo
T#:53750144
Part#: CHU0629
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$ 56.99 USD
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$ 56.99 USD
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Upgraded Coolant Hose from Rein Featuring Metal Flanges to Reduce Leaks
Coolant Return Line
Coolant Return Line
Rein - Corporate Logo
T#:53856300
Part#: 11538650087
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$ 60.99 USD
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$ 60.99 USD
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Rein Automotive turbo hoses are engineered to meet these rigorous demands, providing the reliability required for both the track and the street.
Rein Aluminum Oil Filter Housing - BMW B58
Rein Aluminum Oil Filter Housing - BMW B58
Rein - Corporate Logo
T#:49404665
Part#: 11428583901
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$ 408.99 USD
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$ 408.99 USD
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For those who push their engines to the limit, "good enough" is a liability. Upgrade to the Rein HEU0116 Aluminum Oil Filter Housing—the professional’s choice for durability and peace of mind.
Rein Engine Inlet To Changeover Valve Hose
Rein Engine Inlet To Changeover Valve Hose
Rein - Corporate Logo
T#:52903280
Part#: 17128616914
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$ 45.99 USD
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$ 45.99 USD
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This Rein Automotive coolant hose is an exact-fit aftermarket solution for the BMW "By-Pass Hose".
Rein Water Hose Problem Solver Kit - F chassis N55
Rein Water Hose Problem Solver Kit - F chassis N55
Rein - Corporate Logo
T#:53750119
Part#: 11537598237
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$ 26.99 USD
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$ 26.99 USD
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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
Rein Coolant Hose Supply Elbow - F22 F23 F30 F32 F33 F36 F87 - N55
Rein Coolant Hose Supply Elbow - F22 F23 F30 F32 F33 F36 F87 - N55 ...
Rein - Corporate Logo
T#:53820908
Part#: CHE0985
Ships in 3 Business Days
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$ 73.99

This product was last offered at the strikethrough price on
07-09-2026

$ 25.99 USD
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$ 25.99 USD
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The Rein coolant hose elbow is a targeted engineering solution designed to bypass the flaws of the factory assembly. By isolating the failure prone rubber section, it allows for replacement without disturbing the exhaust manifold or cylinder head connections. This is the strategic choice for teams and technicians who prioritize rapid turnaround and system integrity.
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Rein Engine Coolant Hose - BMW G11, G30 5
Rein Engine Coolant Hose - BMW G11, G30 5
Rein - Corporate Logo
T#:52516262
Part#: CHE0993
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$ 64.99 USD
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$ 64.99 USD
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Restore your cooling system’s integrity with the Rein CHE0993 Engine Coolant Hose.
Rein Coolant Temperature Sensor - BMW E6X, E7X, E9X
Rein Coolant Temperature Sensor - BMW E6X, E7X, E9X
Rein - Corporate Logo
T#:52516266
Part#: ELC0090
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$ 69.99 USD
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$ 69.99 USD
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The Rein ELC0090 is a critical component for BMW N52-series engines, replacing the often-ignored "angle connector" located beneath the intake manifold.
Rein Coolant Expansion Tank Kit - F97 F98 G01 G02 G05 G06 G07 - S58 B46 B58
Rein Coolant Expansion Tank Kit - F97 F98 G01 G02 G05 G06 G07 - S58 B...
Rein - Corporate Logo
T#:55965839
Part#: 17138610661
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$ 56.99 USD
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$ 56.99 USD
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Keep your ultimate driving machine cool under pressure with this replacement auxiliary expansion tank from Rein. On modern turbocharged BMWs, the secondary cooling system plays a critical role in managing intake charge air temperatures, making a solid reservoir vital for both spirited street driving and track day reliability.
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Rein Coolant Expansion Tank - With Cap
Rein Coolant Expansion Tank - With Cap
Rein - Corporate Logo
T#:53891623
Part#: 17135A6A030C
Ships in 3 Business Days
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$ 99.99 USD
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$ 99.99 USD
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Replace your old brittle expansion tank
Aluminum Radiator
Aluminum Radiator
CSF - Corporate Logo
T#:54388384
Part#: 3430
In Stock
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$ 202.99 USD
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$ 202.99 USD
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Keep your MINI’s engine operating at peak performance with this premium aluminum radiator upgrade. Designed to work flawlessly with your factory water pump, this unit maximizes thermal heat transfer by circulating coolant through an optimized horizontal core, utilizing advanced fin architecture to shed heat rapidly. It drops directly onto your factory core support rubber mounts and connects seamlessly to your upper and lower radiator hoses.
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Rein Engine Coolant Reservoir - BMW G1X, G3X
Rein Engine Coolant Reservoir - BMW G1X, G3X
Rein - Corporate Logo
T#:52516268
Part#: EPT0274
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$ 114.99 USD
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$ 114.99 USD
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Protect your BMW investment with the Rein EPT0274 Engine Coolant Reservoir, the professional’s choice for cooling system restoration.
Rein Coolant Expansion Tank - F97 F98 G01 G02 G05 G06 G07 - S58 B46 B58
Rein Coolant Expansion Tank - F97 F98 G01 G02 G05 G06 G07 - S58 B46 B...
Rein - Corporate Logo
T#:55965843
Part#: 171386106612
Ships in 3 Business Days
New Item
$ 49.99 USD
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$ 49.99 USD
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Keep your ultimate driving machine cool under pressure with this replacement auxiliary expansion tank from Rein. On modern turbocharged BMWs, the secondary cooling system plays a critical role in managing intake charge air temperatures, making a solid reservoir vital for both spirited street driving and track day reliability.
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CSF Universal Large Single-Pass Oil Cooler - Universal Application
CSF Universal Large Single-Pass Oil Cooler - Universal Application ...
Universal fitment design - modifications may be necessary to run this cooler
CSF - Corporate Logo
T#:53608839
Part#: 8371
Ships in 3 Business Days
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$ 499.00 USD
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$ 499.00 USD
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CSF redesigned this cooler and went with a more traditional inlet/outlet orientation. The new single pass design features high efficiency and high durability, but with vertically oriented inlet and outlet connections.
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Rein Water Hose With Metal Flange - E70, E71 - N55, N54
Rein Water Hose With Metal Flange - E70, E71 - N55, N54
Rein - Corporate Logo
T#:53750149
Part#: CHU0633
Ships in 3 Business Days
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$ 56.99 USD
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$ 56.99 USD
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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 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...
Rein - Corporate Logo
T#:52903294
Part#: 17129844478
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$ 49.99 USD
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$ 49.99 USD
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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.
Rein Thermostat Assembly - F Chassis, G-Chassis - B48
Rein Thermostat Assembly - F Chassis, G-Chassis - B48
Rein - Corporate Logo
T#:53891628
Part#: 11537644811
Ships in 3 Business Days
New Item
$ 322.99

This product was last offered at the strikethrough price on
06-10-2026

$ 288.99 USD
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$ 288.99 USD
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Whether you're managing a fleet of "spirited" daily drivers or prepping a chassis for the circuit, the Rein CTA0079 offers the peace of mind that comes with OE-quality engineering.
Rein Radiator Expansion Tank Hose - G30 B48 B58
Rein Radiator Expansion Tank Hose - G30 B48 B58
Rein - Corporate Logo
T#:55821725
Part#: 17125A09423
Ships in 3 Business Days
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$ 18.99 USD
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$ 18.99 USD
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While the modern B48 and B58 powerplants are incredibly robust, BMW’s choice of brittle plastics for their cooling loops remains a major weak link. This upper radiator vent hose runs constantly hot as it returns pressurized coolant back to the expansion tank. After years of being baked by engine bay heat, the thin plastic neck and internal quick-disconnect seals degrade. A hardened factory plastic line can snap at any moment, spraying coolant everywhere.
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Rein Water Hose with Metal Flange - E60, E61 - N54
Rein Water Hose with Metal Flange - E60, E61 - N54
Rein - Corporate Logo
T#:53750141
Part#: CHU0460
Ships in 3 Business Days
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$ 52.99 USD
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$ 52.99 USD
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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 Lower Radiator Hose - G30 G11 G14 G15 G16 - N63
Rein Lower Radiator Hose - G30 G11 G14 G15 G16 - N63
Rein - Corporate Logo
T#:55857776
Part#: 17128602669
Ships in 3 Business Days
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$ 49.99 USD
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$ 49.99 USD
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When it comes to keeping your vehicle on the road, a compromised cooling system is a severe vulnerability. Plastic and rubber degrade from constant heat cycling, leading to hairline cracks, swelling, and sudden failure.
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Rein Thermostat Assembly - F22 F87 F23 F30 F34 F32 F33 F36 F15 F16 - N55
Rein Thermostat Assembly - F22 F87 F23 F30 F34 F32 F33 F36 F15 F16 - ...
Rein - Corporate Logo
T#:55965849
Part#: 11537598865
Ships in 3 Business Days
New Item
$ 75.99 USD
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$ 75.99 USD
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A malfunctioning or lazy thermostat can lead to poor fuel trim efficiency, sluggish performance, and destructive overheating. This Rein thermostat assembly is engineered as a robust direct replacement for your worn factory unit, ensuring proper coolant regulation through the radiator under heavy loads.
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Engine Coolant Thermostat - F25 F26 - N55
Engine Coolant Thermostat - F25 F26 - N55
Rein - Corporate Logo
T#:55965845
Part#: 11537586784
Ships in 3 Business Days
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$ 85.99 USD
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$ 85.99 USD
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Maintain exact control over your N55’s operating temperatures under demanding street and track conditions with this Rein replacement thermostat unit. Engineered to match factory standards, this complete housing and thermostat assembly ensures your cooling system handles thermal loads flawlessly to prevent heat soak or dangerous overheating.
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Rein Turbo Coolant Hose - F22/23, F30/34, F32/33, F36, G01, G02, G11, G30, G32 - B58
Rein Turbo Coolant Hose - F22/23, F30/34, F32/33, F36, G01, G02, G11,...
Rein - Corporate Logo
T#:53856297
Part#: 11538611277
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$ 44.99 USD
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$ 44.99 USD
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Rein Automotive Turbo Hoses are engineered to meet these rigorous standards, utilizing premium, OE-quality materials specifically formulated to withstand the extreme duty cycles of modern forced-induction systems.
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