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Rein BMW Cooling System Parts & Accessories for BMW 3 Series E91 (2006-2012)

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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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Upper Radiator Hose - E9x E82 E89 With N52 Engine

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T#:7460

Part#: 17127531579

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$ 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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Radiator Hose for N52 / N54 - Lower

For N52 engines only

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T#:388683

Part#: 17127564478

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$ 33.99 USD

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$ 33.99 USD

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Replace split, hard, or bulging hoses

Rein Water Pipe - E82, E88, E90, E91, E92, E93

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T#:403979

Part#: 11537545890

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$ 20.99 USD

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Connects from the top of the thermostat housing to the engine block

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

OEM Rein Expansion Tank Vent Hose - E82/8 E9X N52

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T#:402113

Part#: 17127618510

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$ 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 with Temerature Sensor Fitting - E82 E88 E90 E91 E...

Lower

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T#:583051

Part#: 17127531581

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$ 27.99 USD

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Radiator to Thermostat Housing

OEM Rein Low Temperature Cooling Module Coolant Hose - BMW E82/88 E9X...

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T#:17738369

Part#: 17127540020

Back Ordered

$ 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 Lower Cooling Hose - E82, E88, E90, E91, E92, E93, Z4

For vehicles with automatic transmission only

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T#:402117

Part#: 17117524710

Ships in 3 Business Days

$ 32.99 USD

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$ 32.99 USD

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Connects to lower coolant pipe

Rein Coolant Inlet Hose Section - E82, E83, E88, E90, E91, E92, E93 ...

For vehicles with manual transmission

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T#:388668

Part#: 11537535829

In Stock at Vendor

$ 30.99

This product was last offered at the strikethrough price on
01-27-2026

$ 20.99 USD

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$ 20.99 USD

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Replaces the rubber section of the water pump inlet pipe - includes two clamps

Rein Coolant Hose - E60, E61, E70, E82, E83, E88, E90, E91, E92, E93,...

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T#:348982

Part#: 11537521049

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$ 17.99 USD

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$ 17.99 USD

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Connects from the water pump to the thermostat

Aluminum Screws for N52 N54 Water Pump

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T#:2253

Part#: 11510392553

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$ 7.13 USD

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$ 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 Radiator Return Hose - E82, E88, E90, E91, E92, E93

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T#:20530

Part#: 64216951946

In Stock

$ 26.99

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

$ 19.99 USD

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HOSE F RADIATOR AND ENGINE R 64216951946 Manufactured by CRP

OEM Rein Coolant Pipe Inlet Hose Section - N52

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T#:388662

Part#: 11537516414

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$ 19.99 USD

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$ 19.99 USD

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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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Water Pump

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T#:46478542

Part#: WPR0046

Ships in 3 Business Days

$ 795.99 USD

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$ 795.99 USD

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Don't take your car's cooling system for granted. A waterpump failure can cost you an engine, which is why preventatively replacing your BMWs waterpump and refreshing the cooling system every 60,000 miles. The water pump is a weak point is the cooling system. Replacing your waterpump will go a long way for keeping your car on the road and operating properly. This water pump fits many 2006 and newer BMW 6 cylinder engines, specifically all the BMWs with the N51, N52, N53 engines. You will also need to purchase replacement aluminum screws Part #11510392553

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OEM Rein Water Pump W/ Installation Kit - BMW E82/88 E9X N52 3.0L ...

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T#:45997535

Part#: WPS0502

In Stock at Vendor

$ 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 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 Temperature Sensor - BMW E6X, E7X, E9X

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T#:52516266

Part#: ELC0090

Ships in 3 Business Days

$ 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.

Radiator Support Bracket

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T#:14122755

Part#: 17117514402

Special Order: No Guaranteed ETA

$ 8.99 USD

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$ 8.99 USD

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Mounts to top of radiator bracket, 2 per vehicle.

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