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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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BMW E9X Z4 E8X Coolant Expansion Tank

2X Entries Into Our F80 M3 Sweepstakes

T#:402142

Part#: 17137640514

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06-22-2026

$ 66.83 USD

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Includes level sensor

Rein Coolant Hose - E82, E84, E88, E90, E92, E93

2X Entries Into Our F80 M3 Sweepstakes

T#:592013

Part#: 17127599450

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08-31-2026

$ 56.04 USD

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Connects your radiator to the thermostat

Coolant Expansion Tank

2X Entries Into Our F80 M3 Sweepstakes

T#:592020

Part#: 17137640515

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08-31-2026

$ 93.09 USD

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Includes level sensor

Rein Coolant Expansion Tank - E46, E53, E83

2X Entries Into Our F80 M3 Sweepstakes

T#:402141

Part#: 17117573781

In Stock

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08-31-2026

$ 72.57 USD

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Includes cap and level sensor

OEM Coolant Return Pipe from Water Pump Hose to Transmission Cooler T...

2X Entries Into Our F80 M3 Sweepstakes

T#:6945

Part#: 11531711384

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Sale - Save 5% $ 68.99

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08-31-2026

$ 65.54 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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BMW E39 Coolant Expansion Tank

2X Entries Into Our F80 M3 Sweepstakes

T#:388645

Part#: 17111436381

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$ 83.59 USD

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BMW E39 Coolant Expansion Tank is an essential component designed to maintain the proper coolant level in your vehicle's cooling system. Manufactured with high-quality materials, this expansion tank ensures reliable performance and durability, preventing engine overheating by accommodating the expansion of coolant as it heats up. The kit includes a level sensor and cap, providing everything needed for a seamless installation. This expansion tank is specifically engineered to meet the exact specifications of your BMW E39, offering a perfect fit and optimal functionality.

Complete Kit: Includes level sensor and cap for easy installation.
High-Quality Construction: Built with durable materials for long-lasting performance.
Prevents Overheating: Helps manage coolant expansion, ensuring engine protection.
Exact Fit: Designed to meet the precise specifications of your BMW E39.
Enhanced Reliability: Ensures proper coolant level maintenance for optimal cooling system function.

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Rein Coolant Hose - Supply Line - E60, E61

2X Entries Into Our F80 M3 Sweepstakes

T#:557219

Part#: 17127546064

In Stock at Vendor

Sale - Save 10% $ 54.85

This product was last offered at the strikethrough price on
05-13-2026

$ 49.17 USD

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Connects from water pump to top left of radiator

Rein Upper Radiator Hose - F06, F07, F10, F12, F13

2X Entries Into Our F80 M3 Sweepstakes

T#:568809

Part#: 17127580957

In Stock

$ 72.99

This product was last offered at the strikethrough price on
06-04-2026

$ 65.99 USD

Limited Qty Sale

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$ 72.99

This product was last offered at the strikethrough price on
06-04-2026

$ 65.99 USD

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From radiator to filter housing

OEM Rein Expansion Tank - F01,F06,F10,F12,F13

2X Entries Into Our F80 M3 Sweepstakes

T#:555024

Part#: 17137647283

Ships in 2 Business Days

Sale - Save 5% $ 118.99

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

$ 113.04 USD

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Replace your damaged expansion tank to prevent coolant loss or potential overheating issues.

his item fits the following BMW Chassis:
F01,F02,F06,F10,F12,F13

Fits BMW Engines including:
N54,N55,N57N

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Expansion Tank Mounting Plate

2X Entries Into Our F80 M3 Sweepstakes

T#:402140

Part#: 17111436250

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08-31-2026

$ 67.44 USD

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Coolant Expansion Tank

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T#:591959

Part#: 17111741167

Ships in 2 Business Days

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$ 66.49 USD

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Plastic has a limited lifespan - replace every 80,000 miles

BMW Engine Water Hose 11531711877

2X Entries Into Our F80 M3 Sweepstakes

T#:6947

Part#: 11531711877

In Stock

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08-31-2026

$ 68.39 USD

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GENUINE BMW ENGINE WATER HOSE 11531711877.--

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

--.

Coolant Expansion Tank

2X Entries Into Our F80 M3 Sweepstakes

T#:388723

Part#: 17137823626

In Stock

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$ 75.04 USD

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Mounts towards the front of the engine bay

Thermostat Housing W/ Thermostat Kit

2X Entries Into Our F80 M3 Sweepstakes
2X Entries For Our G87 M2 Sweepstakes! We Price Match - Give Us A Call or Chat!

T#:599063

Part#: 11538674895

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08-31-2026

$ 104.49 USD

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Lower Radiator Hose To Thermostat Housing - Front

2X Entries Into Our F80 M3 Sweepstakes

T#:599049

Part#: 17122754223

Ships in 3 Business Days

Sale - Save 5% $ 87.99

This product was last offered at the strikethrough price on
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$ 83.59 USD

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Rein Upper Radiator Hose - E60, E63, E64

2X Entries Into Our F80 M3 Sweepstakes

T#:592004

Part#: 17127540665

Ships in 2 Business Days

Sale - Save 5% $ 79.99

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Connects water pump to radiator

Rein Coolant Expansion Tank - E70

2X Entries Into Our F80 M3 Sweepstakes

T#:592030

Part#: 17138621092

In Stock at Vendor

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

$ 95.94 USD

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Replace your cracked or faded tank

Thermostat With Housing

2X Entries Into Our F80 M3 Sweepstakes

T#:582356

Part#: 11537509227

Ships in 4 Business Days

Sale - Save 5% $ 89.99

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

$ 85.49 USD

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

Upper Radiator Hose

2X Entries Into Our F80 M3 Sweepstakes

T#:377397

Part#: 17127519248

Ships in 4 Business Days

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This product was last offered at the strikethrough price on
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$ 95.94 USD

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Attaches to the water pump

OEM Rein Upper Radiator Hose - E53 X5 M62 4.4L 4.6L

2X Entries Into Our F80 M3 Sweepstakes

T#:379731

Part#: 11537500746

In Stock at Vendor

Sale - Save 5% $ 64.99

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

$ 61.74 USD

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Replace your cracked or leaking radiator hose to prevent further leaks and potentially catastrophic failure.

This item fits the following BMWs:
2000-2003 E53 BMW X5 4.4i 4.6is

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OEM Rein Throttle Body Return Hose - E34 525i

2X Entries Into Our F80 M3 Sweepstakes

T#:379743

Part#: 11531738054

Ships in 2 Business Days

Sale - Save 5% $ 61.99

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

$ 58.89 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 Upper Radiator Hose - E53 X5 N62 4.4L 4.8L

2X Entries Into Our F80 M3 Sweepstakes

T#:362526

Part#: 17127526856

Back Ordered

Sale - Save 6% $ 83.99

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

$ 79.05 USD

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Replace your cracked or leaking radiator hose to prevent further leaks and potentially catastrophic failure.

Fits the following BMWs:
2003+ E53 BMW X5 N62 4.4L 4.8L

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Expansion Tank

2X Entries Into Our F80 M3 Sweepstakes

T#:592015

Part#: 17137501959

Ships in 3 Business Days

Sale - Save 5% $ 74.99

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

$ 71.24 USD

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Includes vent screw and leveling switch

Coolant Expansion Tank

2X Entries Into Our F80 M3 Sweepstakes

T#:591949

Part#: 17107514964

Back Ordered

Sale - Save 5% $ 80.99

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

$ 76.94 USD

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Includes bleeder screw

Coolant Hose

2X Entries Into Our F80 M3 Sweepstakes

T#:379793

Part#: 17127534918

In Stock at Vendor

Sale - Save 5% $ 90.99

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

$ 86.44 USD

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From water pump to radiator

Rein Radiator Hose - Upper - E65, E66

2X Entries Into Our F80 M3 Sweepstakes

T#:379749

Part#: 17127535742

Ships in 4 Business Days

Sale - Save 5% $ 89.99

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

$ 85.49 USD

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A common source of cooling system failure

Rein Radiator Hose - E70 X5

2X Entries Into Our F80 M3 Sweepstakes

T#:388766

Part#: 17127536230

In Stock at Vendor

Sale - Save 5% $ 67.99

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

$ 64.59 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 Expansion Tank Mounting Plate - E83

2X Entries Into Our F80 M3 Sweepstakes

T#:402421

Part#: 17113400017

Ships in 4 Business Days

Sale - Save 5% $ 166.99

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

$ 158.64 USD

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$ 166.99

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$ 158.64 USD

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Secures the expansion tank to the radiator

Rein Radiator Hose - Upper - E32, E34

2X Entries Into Our F80 M3 Sweepstakes

T#:6960

Part#: 11531722682

In Stock at Vendor

Sale - Save 5% $ 63.99

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

$ 60.79 USD

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BMW ENGINE WATER HOSE 11531722682.--

This item fits the following BMWs:
BMW 5 Series -535i
BMW 7 Series - 735i, 735iL

--.

Radiator Hose

2X Entries Into Our F80 M3 Sweepstakes

T#:594373

Part#: 17127619255

Ships in 4 Business Days

Sale - Save 5% $ 132.99

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

$ 126.34 USD

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$ 132.99

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$ 126.34 USD

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Replacement Radiator Hose from Rein

Rein Lower Radiator Hose - E53 X5 N62 4.4L 4.8L

2X Entries Into Our F80 M3 Sweepstakes

T#:362530

Part#: 17127509963

Ships in 4 Business Days

Sale - Save 19% $ 51.38

This product was last offered at the strikethrough price on
04-15-2026

$ 41.79 USD

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$ 51.38

This product was last offered at the strikethrough price on
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$ 41.79 USD

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Replace your cracked or leaking radiator hose to prevent further leaks and potentially catastrophic failure.

Fits the following BMWs:
2003+ E53 BMW X5 N62 4.4L 4.8L

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OEM Rein Expansion Tank - E90 335d

2X Entries Into Our F80 M3 Sweepstakes

T#:555023

Part#: 17138570079

Ships in 4 Business Days

Sale - Save 5% $ 124.99

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

$ 118.74 USD

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$ 124.99

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$ 118.74 USD

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Replace your damaged expansion tank to prevent coolant loss or potential overheating issues.

This item fits the following BMW Chassis:
E90

Fits BMW Engines including:
M57

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Radiator Hose - Radiator To Thermostat Housing

2X Entries Into Our F80 M3 Sweepstakes

T#:594377

Part#: 17127619256

Ships in 4 Business Days

Sale - Save 5% $ 99.99

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

$ 94.99 USD

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$ 99.99

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Replacement Radiator Hose - Radiator To Thermostat Housing from Rein

Expansion Tank

2X Entries Into Our F80 M3 Sweepstakes

T#:593074

Part#: 17137601948

Back Ordered

Sale - Save 5% $ 118.99

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

$ 113.04 USD

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$ 118.99

This product was last offered at the strikethrough price on
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$ 113.04 USD

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Cooling system expansion tank

Coolant Expansion Tank

2X Entries Into Our F80 M3 Sweepstakes

T#:592029

Part#: 17138616418

In Stock at Vendor

Sale - Save 5% $ 85.99

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

$ 81.69 USD

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$ 85.99

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$ 81.69 USD

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Replaced your cracked unit with a new coolant expansion tank

Rein Expansion Tank Mounting Plate - E46, Z4

2X Entries Into Our F80 M3 Sweepstakes

T#:402139

Part#: 17111436251

Ships in 2 Business Days

Sale - Save 5% $ 80.99

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

$ 76.94 USD

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$ 80.99

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Mounts to the side of the radiator for retaining the expansion tank

Rein Water Pump - N63 S63

2X Entries Into Our F80 M3 Sweepstakes

T#:393385

Part#: 11517548263

In Stock

Sale - Save 5% $ 215.99

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

$ 205.19 USD

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$ 215.99

This product was last offered at the strikethrough price on
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$ 205.19 USD

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In German, Rein means Pure. In the automotive industry the Rein name has quickly come to represent quality. With fitments for some of the worldaEURtms finest automobiles including BMW and Mini and guaranteed OE quality, Rein is a name you can trust. Replace your water pump with Rein to get your cooling system back in check.

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Upper Radiator Hose

2X Entries Into Our F80 M3 Sweepstakes

T#:557631

Part#: 17122754222

Ships in 4 Business Days

Sale - Save 5% $ 58.99

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

$ 56.04 USD

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$ 58.99

This product was last offered at the strikethrough price on
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$ 56.04 USD

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Intercooler Expansion Tank

2X Entries Into Our F80 M3 Sweepstakes

T#:584477

Part#: 17137647281

In Stock at Vendor

Sale - Save 5% $ 71.99

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

$ 68.39 USD

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$ 71.99

This product was last offered at the strikethrough price on
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$ 68.39 USD

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Rein Coolant Expansion Tank - E60, E61, E63, E64

2X Entries Into Our F80 M3 Sweepstakes

T#:402160

Part#: 17137542986

Ships in 2 Business Days

Sale - Save 5% $ 82.99

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

$ 78.84 USD

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$ 82.99

This product was last offered at the strikethrough price on
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$ 78.84 USD

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Includes fluid level sensor

Rein Coolant Expansion Tank - E65, E66

2X Entries Into Our F80 M3 Sweepstakes

T#:593077

Part#: 17137647713

Ships in 4 Business Days

Sale - Save 5% $ 99.99

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

$ 94.99 USD

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$ 99.99

This product was last offered at the strikethrough price on
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$ 94.99 USD

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Replace your cracked or faded tank

OEM Rein Coolant Hose w/ Temperature Sensor - BMW E60 E63/E64 E65/E66...

2X Entries Into Our F80 M3 Sweepstakes

T#:375746

Part#: 17127508011

In Stock at Vendor

Sale - Save 5% $ 75.99

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

$ 72.19 USD

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$ 75.99

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This hose runs from the lower radiator port on the passenger side of the radiator to the water pump on the engine. Rubber hoses can crack over time, leading to coolant loss. Replace your hose with this OEM Rein hose to eliminate leaks and prevent overheating.

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OEM Rein Radiator Return Hose - BMW E60 525i 530i M54

2X Entries Into Our F80 M3 Sweepstakes

T#:15115

Part#: 17127519257

Ships in 4 Business Days

Sale - Save 5% $ 58.90

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

$ 55.96 USD

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$ 58.90

This product was last offered at the strikethrough price on
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$ 55.96 USD

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Radiator hoses can become brittle over time, leading to cracks and leaks. Replace yours with this OEM Rein coolant hose to ensure your cooling system remains leak free for years to come.

Rein Expansion Tank Return Hose - E60, E61

2X Entries Into Our F80 M3 Sweepstakes

T#:591993

Part#: 17127519258

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Sale - Save 5% $ 56.99

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

$ 54.14 USD

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$ 56.99

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

$ 54.14 USD

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Connects between the top of the radiator and the bottom of the expansion tank

OEM Rein Coolant Supply Hose - BMW E60 525i 530i M54

2X Entries Into Our F80 M3 Sweepstakes

T#:340691

Part#: 17127519255

In Stock at Vendor

Sale - Save 5% $ 66.28

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

$ 62.97 USD

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This product was last offered at the strikethrough price on
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$ 62.97 USD

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Attaches between upper radiator connection radiator and the thermostat housing

Cool Retrun Hose

2X Entries Into Our F80 M3 Sweepstakes

T#:379713

Part#: 17127540666

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Sale - Save 5% $ 80.99

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

$ 76.94 USD

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$ 80.99

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

$ 76.94 USD

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Connects to the radiator

Rein Coolant Expansion Tank - E70

2X Entries Into Our F80 M3 Sweepstakes

T#:592023

Part#: 17137647290

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

$ 81.69 USD

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$ 85.99

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

$ 81.69 USD

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Plastic expansion tanks have a limited lifespan - replace every 80,000 miles

Expansion Tank Mounting Plate

2X Entries Into Our F80 M3 Sweepstakes

T#:591946

Part#: 17101439110

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Sale - Save 5% $ 80.99

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

$ 76.94 USD

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Sale - Save 5%

$ 80.99

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

$ 76.94 USD

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Rein Coolant Hose - E70

2X Entries Into Our F80 M3 Sweepstakes

T#:591811

Part#: 11537547244

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Sale - Save 5% $ 40.99

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

$ 38.94 USD

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$ 40.99

This product was last offered at the strikethrough price on
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$ 38.94 USD

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Coolant hose that runs from the inlet to thermostat

Rein Coolant Return Hose - E60

2X Entries Into Our F80 M3 Sweepstakes

T#:591987

Part#: 17127519249

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Sale - Save 5% $ 55.99

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

$ 53.19 USD

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This product was last offered at the strikethrough price on
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$ 53.19 USD

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Attaches from radiator to water pump inlet

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