BMW Coolant Expansion Tanks for BMW 5 Series E34 (1987-1995)

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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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Expansion Tank Hose
Expansion Tank Hose
2X Entries Into Our F80 M3 Sweepstakes
URO - Corporate Logo
T#:373093
Part#: 11531711002
Back Ordered
$ 41.99 USD
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$ 41.99 USD
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Connects between the thermostat and the lower expansion tank then to the heater core
Coolant Hose
Coolant Hose
2X Entries Into Our F80 M3 Sweepstakes
URO - Corporate Logo
T#:373098
Part#: 64218390710
Ships in 2 Business Days
$ 21.99 USD
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$ 21.99 USD
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Connects to coolant recovery tank
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
Add to Wish List
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 2 Business Days
$ 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
Free Shipping on orders $49 and up
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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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