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
affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms
ECS - Corporate Logo
T#:363070
Part#: 003530ECS01A
In Stock
Sale - Save 40% $ 34.99

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

$ 20.99 USD
Free Shipping on orders $49 and up
Sale - Save 40%
$ 34.99

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

$ 20.99 USD
Free Shipping on orders $49 and up

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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Genuine MINI Engine Coolant Expansion Tank Cap - 17135A1BD89 ...
affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms
Genuine MINI - Corporate Logo
T#:28337931
Part#: 17135A1BD89
Ships in 3 Business Days
26% 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.

$ 25.99 USD
Free Shipping on orders $49 and up
26% 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.

$ 25.99 USD
Free Shipping on orders $49 and up
Forge Motorsport MINI Cooper S Alloy Header Tank FMMINHT-C ...
affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms
Forge - Corporate Logo
T#:19428690
Part#: FMMINHT
Ships in 4 Business Days
$ 278.99 USD
Free Shipping on orders $49 and up

Upgrade your MINI Cooper S with the Forge Motorsport Alloy Header Tank FMMINHT-C. Crafted from high-quality alloy, this coolant tank not only enhances the appearance of your engine bay but also provides lasting durability. Say goodbye to the yellowing of your factory unit due to age. Enjoy the following benefits:

  • High-quality alloy construction ensures longevity.
  • Enhances the appearance of your engine bay.
  • Compatible with the factory pressure cap for easy installation.
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Genuine MINI Coolant Expansion Tank
affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms
Genuine MINI - Corporate Logo
T#:393093
Part#: 17137823626
Ships in 3 Business Days
8% 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.

$ 119.99 USD
Free Shipping
8% 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.

$ 119.99 USD
Free Shipping

2 Pin Connector
affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms
ECS - Corporate Logo
T#:33412932
Part#: 61132359999
Ships on Jul 28, 2026
Sale - Save 25% $ 10.99

This product was last offered at the strikethrough price on
05-03-2026

$ 8.24 USD
Free Shipping on orders $49 and up
Sale - Save 25%
$ 10.99

This product was last offered at the strikethrough price on
05-03-2026

$ 8.24 USD
Free Shipping on orders $49 and up

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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