Rein BMW Cooling System Parts & Accessories for BMW 7 Series E38 (1995-2001)

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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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OEM Coolant Return Pipe from Water Pump Hose to Transmission Cooler T...
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T#:6945
Part#: 11531711384
Ships in 4 Business Days
$ 68.99 USD
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$ 68.99 USD
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This is the cooling system return hose that goes from the automatic transmission cooling thermostat to the hose that comes off the lower water pump outlet.1999-2003 E39 BMW 540i
1999-2001 E38 BMW 740i 740il
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OEM Rein Coolant Hose - E38 E39 M62 4.4L
For vehicles with production date from 09/1998
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T#:375752
Part#: 11537511207
In Stock at Vendor
$ 25.57 USD
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$ 25.57 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.
BMW Engine Water Hose 11531711877
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T#:6947
Part#: 11531711877
In Stock
$ 71.99 USD
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$ 71.99 USD
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GENUINE BMW ENGINE WATER HOSE 11531711877.--

This item fits the following BMWs:
BMW 7 Series - 750iL

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Coolant Expansion Tank
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T#:591959
Part#: 17111741167
In Stock
$ 69.99 USD
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$ 69.99 USD
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Plastic has a limited lifespan - replace every 80,000 miles

BMW Radiator Hose Kit - 11537505229
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T#:46719191
Part#: CHK0008P
Ships in 4 Business Days
$ 61.99 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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OE Rein Lower Radiator Hose - E39 540i, E38 740i/IL 1996-1998 ...
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T#:374352
Part#: 11531741409
In Stock
$ 17.22

This product was last offered at the strikethrough price on
05-02-2026

$ 15.99 USD
Limited Qty Sale
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$ 17.22

This product was last offered at the strikethrough price on
05-02-2026

$ 15.99 USD
Limited Qty Sale
Free Shipping on orders $49 and up
This item fits the following BMWs:    
1997-1998   E39 BMW   540i  
1996-1998   E38 BMW   740i 740il 

Rein Expansion Tank Hose - E31, E38, E39
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T#:375756
Part#: 11531741404
In Stock
$ 8.45 USD
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Connects the expansion tank to the radiator
OEM Rein Expansion Tank Cap - BMW E32 E34 E36 E38 E39 E46 & More ...
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T#:340541
Part#: 17111742231
In Stock
$ 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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Rein Coolant Bleeder Screw CHW1575 - Priced Each
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T#:591955
Part#: 17111712788
In Stock
$ 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 Water Pump O-Ring (Small) - E32, E34, E38, E39
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T#:379680
Part#: 11531710055
In Stock
$ 4.54

This product was last offered at the strikethrough price on
12-12-2025

$ 2.03 USD
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$ 2.03 USD
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When it comes time to replace the water pump, be sure to replace all the O-Rings associated with it to ensure that your car stays leak free. If you are experiencing leaking issues, be sure to inspect these rings, as they might have worn down. This specific ring is used when replacing water pump on cooling pipe to the water accumulator. There are two per car.
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Rein Coolant Return line - E38
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T#:591958
Part#: 17111737708
Ships in 4 Business Days
$ 9.17

This product was last offered at the strikethrough price on
05-05-2026

$ 9.06 USD
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$ 9.06 USD
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From expansion tank to radiator
Coolant hose
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T#:593459
Part#: 64218390355
Ships in 4 Business Days
$ 13.99 USD
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Rein Coolant Overflow Hose
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T#:19458
Part#: 17111427156
Ships on Jun 22, 2026
$ 5.99 USD
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Rein Coolant Overflow Hose is designed to meet the highest standards of performance and durability for your vehicle's cooling system. This high-quality hose ensures the proper transfer of excess coolant from the engine to the overflow reservoir, preventing overheating and ensuring optimal engine performance. Manufactured from reinforced rubber materials, the Rein Coolant Overflow Hose guarantees long-lasting reliability and precise fitment for various vehicle makes and models. It’s the perfect upgrade or replacement for worn-out hoses in any cooling system.

Available through Turner Motorsport, this coolant overflow hose is rigorously tested to withstand extreme temperatures, pressures, and daily use. If you’re looking to maintain or improve your car's cooling efficiency, the Rein Coolant Overflow Hose is an essential component.

  • Precision engineered for a perfect fit
  • Manufactured from durable, reinforced rubber
  • Designed to withstand high temperatures and pressures
  • Improves cooling system efficiency and prevents overheating
  • Easy installation with OE-spec dimensions
  • Available at Turner Motorsport, trusted for automotive parts

Enhance your vehicle's performance and reliability by replacing your old coolant hose with the Rein Coolant Overflow Hose today.

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Rein Radiator Hose - Upper - E38
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T#:591793
Part#: 11531741408
Ships in 2 Business Days
$ 13.99 USD
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Hose from radiator to water pump
OEM Rein Coolant Supply Hose - E38 740i/il
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T#:379736
Part#: 64218371386
Ships in 2 Business Days
$ 10.99 USD
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Runs from the water valve to the Right heater core inlet. 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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Coolant hose
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T#:592665
Part#: 64218391121
Ships in 4 Business Days
$ 14.99 USD
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Rein Thermostat Assembly E38 740iL
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T#:34114233
Part#: 11531437526
Ships in 2 Business Days
$ 68.99 USD
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Regulates Engine coolant temperature. Comes with aluminum housing, O-ring, and sensor.
Rein O-RING 14.4X3.0 - E38, E39
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T#:379805
Part#: 11537501777
Ships in 4 Business Days
$ 6.99 USD
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$ 6.99 USD
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OE Rein Upper Radiator Hose - E39 540i, E38 740i/IL 1996-1998 ...
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T#:6976
Part#: 11531745595
Ships in 4 Business Days
$ 16.99 USD
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ENGINE WATER HOSE 11531745595.--

This item fits the following BMWs:
BMW 5 Series - 540i, 540i Wagon
BMW 7 Series - 740i, 740iL

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OEM Rein Heating Core Return Hose - E38 740i/il
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T#:375753
Part#: 64218390319
Ships in 2 Business Days
$ 7.63 USD
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Attaches to the water pipe on the back of the engine block to the secondary water pump. 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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OEM Rein Coolant Line - E38
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T#:379758
Part#: 64218377662
Ships in 4 Business Days
$ 15.99 USD
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Runs from the right heater core 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.
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OEM Rein Coolant Hose - E38 740i/il
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T#:379723
Part#: 64218380270
Ships in 2 Business Days
$ 17.32 USD
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Attaches to the water pipe on the back of the engine block to the secondary water pump. 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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OEM Radiator Water Valve Hose - Left - E38 740
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T#:11094
Part#: 64218391122
Back Ordered
$ 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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BMW Coolant Expansion Tank With Cap
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T#:46616009
Part#: EPK0013
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$ 64.99 USD
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The coolant expansion tank in your vehicle gives additional fluid a place to go after expansion and contraction from temperature change. Because it is subjected to such drastic changes on a regular basis, it can often crack or break. You want to keep all the coolant in your vehicle in the cooling system. If your tank has experienced damage such as cracking, nipples breaking off, or mounting point damage, you will need to replace it. This replacement will fit perfectly and provide the same heating and cooling characteristics as an original unit. When replacing, be sure to have some extra coolant. Check ECS Tuning's website for a wide variety of coolants specifically designed for your car. Most German vehicles require specialized coolant. Be sure to pick up the proper coolant when refilling to avoid damage or premature corrosion.
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Expansion Tank Hose
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T#:379785
Part#: 17111737819
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$ 26.99 USD
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Connects the expansion tank to the radiator