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Rein BMW Coolant & Radiator Hoses

We offer replacement hoses from several OE brands that we trust, along with performance silicone upgrades for those who want increased wear resistance compared to factory rubber.

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Expansion Tank Hose

2X Entries Into Our F80 M3 Sweepstakes

T#:379785

Part#: 17111737819

Back Ordered

Sale - Save 5% $ 26.99

This product was last offered at the strikethrough price on
08-31-2026

$ 25.64 USD

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Sale - Save 5%

$ 26.99

This product was last offered at the strikethrough price on
08-31-2026

$ 25.64 USD

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Connects the expansion tank to the radiator

Return Hose

2X Entries Into Our F80 M3 Sweepstakes

T#:17704695

Part#: 11537637059

Ships in 4 Business Days

Sale - Save 5% $ 59.99

This product was last offered at the strikethrough price on
08-31-2026

$ 56.99 USD

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Sale - Save 5%

$ 59.99

This product was last offered at the strikethrough price on
08-31-2026

$ 56.99 USD

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OE quality return hose for the cooling system.

BMW Radiator Hose Kit - 11537830715

2X Entries Into Our F80 M3 Sweepstakes

T#:46719180

Part#: CHK0376R

Ships in 4 Business Days

Sale - Save 6% $ 43.99

This product was last offered at the strikethrough price on
08-31-2026

$ 41.48 USD

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Qty

Sale - Save 6%

$ 43.99

This product was last offered at the strikethrough price on
08-31-2026

$ 41.48 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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OEM Radiator Water Valve Hose - Left - E38 740

2X Entries Into Our F80 M3 Sweepstakes

T#:11094

Part#: 64218391122

Back Ordered

Sale - Save 5% $ 6.54

This product was last offered at the strikethrough price on
08-31-2026

$ 6.21 USD

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Qty

Sale - Save 5%

$ 6.54

This product was last offered at the strikethrough price on
08-31-2026

$ 6.21 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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