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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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OEM Radiator Water Valve Hose - Left - E38 740

2X Entries Into Our F80 M3 Sweepstakes

T#:11094

Part#: 64218391122

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$ 6.54 USD

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$ 6.54 USD

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This is the hose that runs from the left radiator to the water valve. 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.

This item fits the following BMWs:
1999-2001 E38 BMW 740i 740il

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OEM Rein Coolant Expansion Tank Overflow Hose - BMW F25 X3, F26 X4 N5...

2X Entries Into Our F80 M3 Sweepstakes

T#:45757476

Part#: 17128651298

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$ 31.99 USD

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$ 31.99 USD

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This hose connects the expansion tank to the upper radiator hose. If your coolant expansion tank hose is cracked or leaking, replace it early to prevent further coolant loss and eventual overheating.

BMW Radiator Hose Kit - 11537830715

2X Entries Into Our F80 M3 Sweepstakes

T#:46719180

Part#: CHK0376R

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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Return Hose

2X Entries Into Our F80 M3 Sweepstakes

T#:17704695

Part#: 11537637059

Ships in 3 Business Days

$ 59.99 USD

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$ 59.99 USD

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OE quality return hose for the cooling system.

Rein - Radiator Expansion Tank Vent Line Hose - F10 528i, F10 528iX ...

2X Entries Into Our F80 M3 Sweepstakes

T#:34080737

Part#: 17128651450

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$ 57.99 USD

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$ 57.99 USD

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Radiator Expansion Tank Vent Line Hose is an essential component designed to maintain the proper functioning of your BMW’s cooling system. This high-quality hose ensures that excess pressure is properly vented from the radiator expansion tank, helping to prevent overheating and coolant leaks. Built to meet or exceed OEM standards, the Radiator Expansion Tank Vent Line Hose offers a direct-fit solution for reliable and efficient performance. Available through Turner Motorsport, this hose ensures long-lasting durability and a seamless installation process.

Designed specifically for BMW models, ensuring perfect fit and compatibility
Helps regulate pressure within the radiator expansion tank, preventing overheating
Reduces the risk of coolant leaks and engine damage
Manufactured from durable, heat-resistant materials for long-lasting performance
Easy, direct-fit replacement for hassle-free installation
Meets or exceeds OEM specifications for superior reliability and efficiency

Upgrade your BMW’s cooling system with the Radiator Expansion Tank Vent Line Hose to ensure optimal engine performance and prevent costly repairs.

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Upper Radiator Hose

2X Entries Into Our F80 M3 Sweepstakes

T#:12806792

Part#: 17129802110

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$ 52.99 USD

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$ 52.99 USD

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Rein Heater Hose - E32, E34

2X Entries Into Our F80 M3 Sweepstakes

T#:20514

Part#: 64211390935

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$ 12.99 USD

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$ 12.99 USD

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HOSE F WATER VALVE AND LEFT 64211390935 Manufactured by CRP

Coolant Hose

2X Entries Into Our F80 M3 Sweepstakes

T#:592009

Part#: 17127563852

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$ 39.99 USD

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$ 39.99 USD

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Connects the transmission heat exchange to the coolant return line

Coolant Hose

2X Entries Into Our F80 M3 Sweepstakes

T#:379702

Part#: 17127508014

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$ 25.99 USD

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$ 25.99 USD

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This is the return hose that attaches from the water pump to the radiator

Rein Radiator Hose - Radiator To Thermostat

2X Entries Into Our F80 M3 Sweepstakes

T#:17605210

Part#: 17127612445

Ships in 3 Business Days

$ 58.99 USD

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$ 58.99 USD

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Rein lower radiator hose replacement.

Water Pump Service Kit

2X Entries Into Our F80 M3 Sweepstakes

T#:57616368

Part#: WPS0506

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$ 1,326.99 USD

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$ 1,326.99 USD

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Prevent cooling system failures before they track-side or daily-drive disrupt your journey with a race-grade, bulletproofed replacement solution.

Water Pump Service Kit

2X Entries Into Our F80 M3 Sweepstakes

T#:57616370

Part#: WPS0504

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$ 1,264.99 USD

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$ 1,264.99 USD

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Keep your cooling system performing at its peak with this complete Rein Water Pump Service Kit.

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