BMW Coolant Expansion Tanks for BMW 3 Series E36 (1992-1998)

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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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Bav Auto Coolant Expansion Tank - E36 E39 Z3 M50 M52 S50 S52
Bav Auto Coolant Expansion Tank - E36 E39 Z3 M50 M52 S50 S52 ...
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Bavarian Autosport - Corporate Logo
T#:638094
Part#: 17111723520
In Stock
Sale - Save 20% $ 39.99

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

$ 31.99 USD
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Sale - Save 20%
$ 39.99

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

$ 31.99 USD
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Replace your old expansion tank to prevent potential failure or leaks. Includes a brand new coolant level sensor. From 1974 to 2019, Bavarian Autosport was one of the premier vendors for BMW and MINI auto parts. We are happy to preserve the Bav Auto legacy by continuing to carry their high-quality products into the future. All Bav Auto parts will remain unchanged in design and sourced from the same OEM suppliers to ensure long-lasting reliability. We trust these parts, accessories, and upgrades so confidently that we back every Bavarian Autosport branded component with a 2-year warranty.
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Coolant Expansion Tank
Coolant Expansion Tank
2X Entries Into Our F80 M3 Sweepstakes
URO - Corporate Logo
T#:373102
Part#: 17111723520
In Stock
$ 30.99 USD
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$ 30.99 USD
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Does not include cap or coolant level sensor
Coolant Level Sensor
Coolant Level Sensor
For vehicles with production date from 03/1996 For vehicles with production date from 06/1995
2X Entries Into Our F80 M3 Sweepstakes
URO - Corporate Logo
T#:379491
Part#: 61318360855
Ships in 1 Business Day
$ 12.99 USD
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$ 12.99 USD
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Monitors the coolant level in the expansion tank
Bav Auto Coolant Level Sensor - BMW E36 E39 M50/52 S50/52
Bav Auto Coolant Level Sensor - BMW E36 E39 M50/52 S50/52
For vehicles with production date from 03/1996 For vehicles with production date from 06/1995
10X Entries Into Our F80 M3 Sweepstakes
Bavarian Autosport - Corporate Logo
T#:639793
Part#: 61318360855
In Stock
Sale - Save 19% $ 20.99

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

$ 16.99 USD
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Sale - Save 19%
$ 20.99

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

$ 16.99 USD
Free Shipping on orders $49 and up
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This is the sensor / sending unit that notifies the computer if your coolant level is low. When this fails, it can give a false indication of low coolant -- or worse, not inform you of a low coolant situation that could potentially cause overheating. From 1974 to 2019, Bavarian Autosport was one of the premier vendors for BMW and MINI auto parts. We are happy to preserve the Bav Auto legacy by continuing to carry their high-quality products into the future. All Bav Auto parts will remain unchanged in design and sourced from the same OEM suppliers to ensure long-lasting reliability. We trust these parts, accessories, and upgrades so confidently that we back every Bavarian Autosport branded component with a 2-year warranty.
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Bav Auto Expansion Tank Cap - E36 E46 E34 E39 E32 E38 E65 X3 X5 Z4
Bav Auto Expansion Tank Cap - E36 E46 E34 E39 E32 E38 E65 X3 X5 Z4 ...
10X Entries Into Our F80 M3 Sweepstakes
Bavarian Autosport - Corporate Logo
T#:640208
Part#: 17117639022
In Stock
Sale - Save 15% $ 13.99

This product was last offered at the strikethrough price on
06-03-2026

$ 11.89 USD
Free Shipping on orders $49 and up
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Sale - Save 15%
$ 13.99

This product was last offered at the strikethrough price on
06-03-2026

$ 11.89 USD
Free Shipping on orders $49 and up
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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. From 1974 to 2019, Bavarian Autosport was one of the premier vendors for BMW and MINI auto parts. We are happy to preserve the Bav Auto legacy by continuing to carry their high-quality products into the future. All Bav Auto parts will remain unchanged in design and sourced from the same OEM suppliers to ensure long-lasting reliability. We trust these parts, accessories, and upgrades so confidently that we back every Bavarian Autosport branded component with a 2-year warranty.
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URO Coolant Expansion Tank - BMW E30 E36 Z3 M42 M44, E34 325
URO Coolant Expansion Tank - BMW E30 E36 Z3 M42 M44, E34 325 ...
2X Entries Into Our F80 M3 Sweepstakes
URO - Corporate Logo
T#:362008
Part#: 17111712835
Ships in 1 Business Day
$ 18.99 USD
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$ 18.99 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
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URO Expansion Tank Cap - BMW E30
URO Expansion Tank Cap - BMW E30
2X Entries Into Our F80 M3 Sweepstakes
URO - Corporate Logo
T#:592118
Part#: 17111468077
In Stock
$ 6.99 USD
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$ 6.99 USD
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URO Expansion Tank Cap - BMW E30

The URO Expansion Tank Cap - BMW E30 is a crucial component for maintaining optimal cooling system performance by ensuring proper pressure regulation. Over time, older radiator caps lose their ability to hold pressure, leading to a lower boiling point and potential overheating issues. This high-quality replacement cap is designed to restore factory pressure levels, preventing coolant loss and maintaining engine efficiency. Crafted from durable materials, it resists wear and temperature fluctuations, ensuring long-lasting reliability.

  • Direct replacement for BMW E30 models
  • Maintains correct cooling system pressure to prevent overheating
  • Helps sustain optimal engine temperature and performance
  • High-quality construction for durability and reliability
  • Prevents coolant evaporation and system inefficiencies
  • Easy installation with OE-style fitment
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