BMW Coolant Expansion Tanks for MINI

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On certain models, namely E36, E46, and E90, the factory BMW expansion tank is prone to either breaking at connection points or blowing apart altogether. If you're starting to feel like your expansion tank is on borrowed time, it's probably time to replace with either a direct OE replacement, or strengthen your cooling setup with an aluminum expansion tank - we offer numerous performance upgrades for your expansion tank. Especially if you're someone who likes to track your BMW, we recommend upgrading your expansion tank to avoid ruining your track day.
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ECS Tuning Aluminum Coolant Bleeder Screw
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T#:363070
Part#: 003530ECS01A
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$ 26.99 USD
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Replace the flimsy plastic bleeder screw used in the coolant expansion tank or in one of the cooling system hoses with this high quality, durable, aluminum bleeder screw. The stock plastic screw can deform over time due to heat or even regular use. We have even seen the head of the screw snap off, leaving the threaded body stuck in the expansion tank. This aluminum screw will help to prevent sudden failure of the bleeder screw, which can result in immediate overheating of the car.

ECS Tuning's Aluminum Coolant Bleeder Screw replaces Genuine BMW Part Number 17111712788

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Coolant Expansion Tank
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T#:30728965
Part#: 17137823626
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$ 38.34 USD
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Expansion Tank - Aluminum - R50/R52/R53
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Canton Racing - Corporate Logo
T#:19428667
Part#: 80-272
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$ 185.00 USD
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Upgrade your Gen1 Mini Cooper & Cooper S with this high-quality coolant expansion/fill tank from Canton Racing. With a billet radiator-style neck designed to accept the Canton Racing part #81-030 pressure cap or any 30 psi radiator-style cap, this aluminum tank offers superior performance and style.
  • Features a billet radiator-style neck for enhanced durability
  • Resolves expansion tank issues with a solid, built-in mount
  • Eliminates worries about separating and leaking plastic tanks
  • Perfectly complements Canton Racing 77-272 MINI power steering tank
Ensure reliability and improve the aesthetic appeal of your engine bay with this Canton Racing Aluminum coolant expansion/fill tank for your Gen1 Mini Cooper & Cooper S.
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Genuine MINI Engine Coolant Expansion Tank Cap - 17135A1BD89 ...
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T#:28337931
Part#: 17135A1BD89
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9% off MSRP $ 34.99

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$ 31.99 USD
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9% off MSRP
$ 34.99

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 31.99 USD
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Coolant Expansion Tank
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T#:587608
Part#: 17137823626
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$ 47.99

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$ 41.99 USD
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$ 47.99

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Coolant Expansion Tank
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Rein - Corporate Logo
T#:388723
Part#: 17137823626
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$ 75.04 USD
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Mounts towards the front of the engine bay

Coolant Expansion Tank W/ Cap
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Bremmen Parts - Corporate Logo
T#:639188
Part#: 17137529273
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$ 32.94 USD
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Expansion Tank Pressure Cap - 30 Lbs W10 W11 1.6L Engine
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Canton Racing - Corporate Logo
T#:19428666
Part#: 81-030
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$ 38.00 USD
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Ensure optimal performance of your Mini's cooling system with the Expansion Tank Pressure Cap - 30 Lbs W10 W11 1.6L Engine. Designed for use with Canton Racing aluminum expansion tanks or similar applications, this 30psi radiator style cap provides reliable pressure control. Keep your engine running smoothly with this essential component.
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expansion tank
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Febi - Corporate Logo
T#:340725
Part#: 17137823626
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$ 68.32

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05-02-2026

$ 54.99 USD
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$ 68.32

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$ 54.99 USD
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Radiator Expansion Tank - Behr
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Mahle-Behr - Corporate Logo
T#:579568
Part#: 376737181
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$ 65.86 USD
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OEM Behr Radiator Expansion Tank - MINI Cooper R50 R52
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Mahle-Behr - Corporate Logo
T#:19450
Part#: 17107509071
Ships in 3 Business Days
$ 36.99 USD
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This high quality BEHR brand expansion tank is used on MINI Cooper R50 R52, and is a common failure item. BEHR was the original equipment supplier to BMW, so you know the BEHR made expansion tank will be the highest quality available. Be cautious of competitors selling this part for less -- is it a BEHR? Probably not. We only carry the BEHR brand expansion tank as it is the only one we use in our own MINIs. If you are overhauling your coolant system, now is the time to consider preventative replacing this expansion tank. These are known to go bad, causing a leak which can leave you stranded. We have found that the expansion tanks should be replaced based on age as well as condition. Expansion tanks seem to have a lifespan of less than six years before they show signs of fatigue and wear. Pre-emptively replacing the expansion tank as part of an overall maintenance plan can prevent you from getting stranded from a sudden failure later on.

Hailing from Stuttgart, Mahle-Behr specializes in automotive cooling systems. From air conditioning to engine cooling M-B has you covered with OE-quality replacement parts.

This item fits the following MINIs:
2002-2006 R50 MINI MINI Cooper
2005-2008 R52 MINI MINI Cooper Convertible.
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Coolant Expansion Tank - R56 MINI Cooper S
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Mahle-Behr - Corporate Logo
T#:46488
Part#: 17137823626
Back Ordered
$ 67.99 USD
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This high-quality BEHR brand expansion tank is used on MINI Cooper R55 R56 and is a common failure item. BEHR was the original equipment supplier to BMW, so you know the BEHR made expansion tank will be the highest quality available. Be cautious of competitors selling this part for less -- is it a BEHR? Probably not. We only carry the BEHR brand expansion tank as it is the only one we use in our own MINIs. If you are overhauling your coolant system, now is the time to consider preventative replacing this expansion tank. These are known to go bad, causing a leak which can leave you stranded. We have found that the expansion tanks should be replaced based on age as well as condition. Expansion tanks seem to have a lifespan of fewer than six years before they show signs of fatigue and wear. Pre-emptively replacing the expansion tank as part of an overall maintenance plan can prevent you from getting stranded from a sudden failure later on.

Hailing from Stuttgart, Mahle-Behr specializes in automotive cooling systems. From air conditioning to engine cooling M-B has you covered with OE-quality replacement parts.

This item fits the following MINIs:
2007+ R56 MINI MINI Cooper, MINI Cooper S
2007+ R55 MINI MINI Cooper Clubman, MINI Cooper S Clubman
2007+ R57 MINI MINI Cooper Convertible, MINI Cooper S Convertible,
2011+ R60 MINI MINI Cooper Countryman, MINI Cooper Countryman S


This item fits the following BMWs:
2015+ I01 BMW i3
2015+ I12 BMW i8
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Bremmen Coolant Bleeder Screw - BMW E30 E36 E38 E39 E46 E83 E90 Z4 ...
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T#:640140
Part#: 17111712788
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$ 2.44 USD
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Plastic bleeder screw for cooling system is used to bleed air that would otherwise create an air pocket and lead to overheating. Includes o-ring seal.
Coolant Expansion Tank W/ Cap
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T#:598574
Part#: 17137529273
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$ 37.07 USD
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Expansion Tank - 17137617362
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Rein - Corporate Logo
T#:46478556
Part#: EPT0238
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$ 53.28 USD
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These expansion tanks tend to leak and will need replaced

Coolant Expansion Tank W/ Cap
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T#:592210
Part#: 17137529273
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$ 42.74 USD
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Rein Reservoir Hose R50 / R52
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T#:34114213
Part#: 17127526414
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Reservoir Hose CHE0885 is a top-quality replacement part designed for BMW vehicles, ensuring a reliable connection between your vehicle’s reservoir and cooling system. Engineered for durability and heat resistance, this hose provides a seamless flow of coolant to maintain optimal engine temperature, preventing overheating. Reservoir Hose CHE0885 is made to meet or exceed OEM specifications, ensuring a perfect fit for your BMW. Available through Turner Motorsport, this hose is an essential component for keeping your vehicle's cooling system functioning efficiently.

  • High-quality reservoir hose for BMW vehicles
  • Ensures reliable coolant flow for optimal engine performance
  • Made from heat-resistant, durable materials
  • Prevents overheating and engine damage
  • Meets or exceeds OEM specifications
  • Perfect fit for a variety of BMW models
  • Available from trusted supplier Turner Motorsport
  • Easy to install with secure connections
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Genuine MINI Coolant Expansion Tank
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Genuine MINI - Corporate Logo
T#:393093
Part#: 17137823626
Ships in 2 Business Days
7% off MSRP $ 129.99

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$ 120.99 USD
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7% off MSRP
$ 129.99

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 120.99 USD
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MINI R50 to R53 Expansion Tank Aluminum Wrinkle Black & Cap - Kit ...
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Canton Racing - Corporate Logo
T#:31390597
Part#: 80-272BLKKT
Ships on Jul 24, 2026
$ 261.00 USD
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MINI R50 to R53 Expansion Tank Aluminum Wrinkle Black & Cap - Kit offers the premium quality of Canton Racing for MINI enthusiasts. This high-grade aluminum expansion tank features a sleek Wrinkle Black powder-coated finish, designed to replace the original plastic tank with ease.

  • Premium Quality: Made from durable aluminum with a Wrinkle Black powder-coated finish for enhanced aesthetics and longevity.
  • Direct Replacement: Utilizes the original mountings for a hassle-free installation, ensuring a perfect fit.
  • Enhanced Functionality: Upgrades from the standard plastic tank to improve both appearance and performance over time.
  • Kit Includes:
    • Canton Racing Coolant Tank in Wrinkle Black Powdercoating
    • Canton Racing Stant Tank Cap
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Expansion Tank Aluminum - Wrinkle Black R50 R52 R53
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Canton Racing - Corporate Logo
T#:19428688
Part#: 80-272BLK
Ships on Jul 24, 2026
$ 223.00 USD
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Upgrade your Gen1 Mini Cooper or Cooper S with the coolant expansion/fill tank featuring a billet radiator-style neck. This tank accepts the Canton Racing part #81-030 pressure cap or any 30 psi radiator-style cap. The Canton Racing Aluminum tank with Powdercoated Wrinkle Black finish not only enhances the engine bay aesthetics but also resolves expansion tank issues with its solid build and built-in mount. Say goodbye to concerns about separating and leaking plastic expansion tanks. Pair it with the Canton Racing 77-272 MINI power steering tank for a perfect combination.

  • Features a billet radiator-style neck
  • Accepts Canton Racing pressure cap or any 30 psi radiator-style cap
  • Enhances engine bay aesthetics with Powdercoated Wrinkle Black finish
  • Resolves expansion tank issues with solid build and built-in mount
  • Eliminates worries about separating and leaking plastic tanks
  • Perfect complement to Canton Racing 77-272 MINI power steering tank
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MINI R50 to R53 Expansion Tank / Power Steering Tank - Wrinkle Black ...
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Canton Racing - Corporate Logo
T#:31423679
Part#: 80-272BLKKT1KT
Ships on Jul 24, 2026
$ 479.00 USD
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MINI R50 to R53 Expansion Tank / Power Steering Tank - Wrinkle Black Aluminum is a high-quality solution designed to address both coolant expansion and power steering needs in one kit. This kit includes a billet-style expansion tank with a radiator neck that accepts the Canton Racing part #81-030 pressure cap or any 30 psi radiator cap, ensuring a secure and leak-proof seal.

Key benefits of the MINI R50 to R53 Expansion Tank / Power Steering Tank - Wrinkle Black Aluminum include:

  • Dual Functionality: Combines both expansion tank and power steering tank into a single, convenient kit.
  • Durable Construction: Made from aluminum with a wrinkle black finish, providing long-lasting performance and a sleek appearance.
  • Enhanced Sealing: Features a billet radiator-style neck that fits standard 30 psi radiator caps, preventing leaks and ensuring reliable operation.
  • Reliable Design: Eliminates the issues associated with plastic tanks, such as separation and leakage.
  • Complete Kit: Includes a black expansion tank, black power steering tank, and a Stant cap for easy installation.
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2 Pin Connector
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ECS - Corporate Logo
T#:33412932
Part#: 61132359999
Ships on Jul 28, 2026
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06-14-2026

$ 8.24 USD
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Includes connector housing with terminals and seals. Commonly used for the coolant level sensor.

ECS Tuning replacement harness connectors include all necessary pins and wire seals for a complete harness repair. Whether you have a broken harness connector or need a complete wiring repair, we have the components you need.

Each connector includes an additional terminal in case one becomes lost or damaged during installation.

*OEM cross reference PN# 61132359999 - Commonly used for the coolant level sensor.

Please reference the original part number from the existing connector to confirm fitment, before ordering.

Suggested tools:

Suggested crimping pliers: T#387193
Wire De-pin tools:
12pc De-Pin Tool Set - T#386379
23pc De-Pin Tool Set - T#641943

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MINI F5X F6X Expansion Tank
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Bremmen Parts - Corporate Logo
T#:28138156
Part#: 17137617362
Special Order: No Guaranteed ETA
Sale - Save 5% $ 81.99

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$ 77.51 USD
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MINI F5X F6X Expansion Tank

For Mini owners looking to maintain optimal engine performance, the MINI F5X F6X Expansion Tank is an essential component. This expansion tank ensures proper cooling system functionality, preventing overheating and potential engine damage. Crafted with high-quality materials, it guarantees durability and reliability for long-term use, providing peace of mind to Mini enthusiasts.

  • Ensures proper cooling system functionality
  • Prevents overheating and potential engine damage
  • Crafted with high-quality materials for durability
  • Provides peace of mind to Mini enthusiasts
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Meyle Expansion Tank - BMW F39/F44/F48, MINI F54/56/57/60 (B48/46/36)...
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Meyle - Corporate Logo
T#:8677201
Part#: 17138687503
Special Order: No Guaranteed ETA
$ 67.99 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.
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Coolant Expansion Tank
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Meyle - Corporate Logo
T#:55569540
Part#: 17137823626
Special Order: No Guaranteed ETA
New Item
$ 74.99 USD
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