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Rein BMW Cooling System Parts & Accessories for BMW X Series E83 (2004-2010)

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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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Heater Inlet Pipe

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T#:594330

Part#: 11531705210

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$ 40.99 USD

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$ 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 Expansion Tank - E46, E53, E83

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T#:402141

Part#: 17117573781

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$ 76.39 USD

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$ 76.39 USD

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Includes cap and level sensor

Water Pipe

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T#:594365

Part#: 11537502000

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$ 40.09

This product was last offered at the strikethrough price on
01-10-2026

$ 39.99 USD

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Water pipes are essential for proper cooling. If they are cracked, they are going to need to be replaced as soon as possible to avoid overheating your engine. This water pipe runs from the back of the water pump housing to the expansion tank hose. Includes all required seals, needed for the install.

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Rein Expansion Tank Mounting Plate - E83

For vehicles with an automatic transmission

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T#:402421

Part#: 17113400017

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$ 166.99 USD

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Secures the expansion tank to the radiator

Rein Cylinder Head To Thermostat Hose - E83

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T#:591814

Part#: 11537552339

Ships in 1 Business Day

$ 37.06 USD

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$ 37.06 USD

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Replace your leaking coolant hose

OEM Rein Lower Expansion Tank Coolant Hose - E83 X3

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T#:363441

Part#: 11533400205

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$ 27.99 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.

Thermostat With Housing

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T#:582356

Part#: 11537509227

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$ 89.99 USD

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Stop leaks before they start with this new Thermostat With Housing from Rein.

Coolant Hose

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T#:592656

Part#: 64213400417

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$ 20.99 USD

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Connects the expansion tank to the heater core

Rein Radiator Hose - Automatic Transmission - E83

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T#:19573

Part#: 17123417607

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$ 36.99 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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Rein Radiator Hose - Lower - E83

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T#:362528

Part#: 17123413819

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$ 45.99 USD

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Includes port for coolant temperature sensor

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

OEM Rein Lower Radiator Hose - E83 N52 3.0L

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T#:379822

Part#: 17123422785

In Stock at Vendor

$ 37.99 USD

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$ 37.99 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.

OEM Rein Lower Radiator Hose - E83 X3

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T#:379773

Part#: 17123424499

Back Ordered

$ 36.99 USD

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$ 36.99 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.

Rein Coolant Bleeder Screw CHW1575 - Priced Each

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T#:591955

Part#: 17111712788

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$ 4.99 USD

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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 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

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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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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OEM Rein Expansion Tank Cap - BMW E32 E34 E36 E38 E39 E46 & More ...

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T#:340541

Part#: 17111742231

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$ 17.99 USD

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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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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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OEM Rein Coolant Hose - E60 E61 E83 Z4

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T#:583591

Part#: 11537519494

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$ 18.99 USD

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$ 18.99 USD

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Attaches from inlet pipe to heat exchanger. 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 Radiator Hose Kit - 17123413819

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T#:46719171

Part#: CHK0198

Ships in 3 Business Days

$ 49.99 USD

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$ 49.99 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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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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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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