BMW Cooling System Parts & Accessories for BMW 3 Series E91 (2006-2012)

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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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Turner Heavy Duty Aluminum Expansion Tank Kit - E8X E9X N20/N52/N54 ...
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Turner Motorsport - Corporate Logo
T#:12806793
Part#: 008378LA02
In Stock
Sale - Save 20% $ 479.99

This product was last offered at the strikethrough price on
06-14-2026

$ 383.99 USD
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Sale - Save 20%
$ 479.99

This product was last offered at the strikethrough price on
06-14-2026

$ 383.99 USD
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Our Turner Motorsport's full aluminum expansion tank was designed and engineered in house to help with the weak point in your N52/N54 cooling system. The coolant expansion tank goes through heat cycles over and over again from regular driving, it is important that your expansion tank is doing its job to retain coolant to keep your engine operating temperatures down and keep your engine bay clean. Not only is this a major upgrade but also a great maintenance item to replace. Our expansion tank was designed to fit the OEM hoses for an easy install and comes with all the upgraded items you will need for a clean install

If your BMW needs a new expansion tank, make sure this is the last expansion tank you ever need to buy. Our coolant expansion tank has a full aluminum construction and wrinkle black powder coat for durability. Expansion tank kit comes with all the accessories you need to replace your expansion tank once, and never have to worry about it again.

Product Features:

Maintains stock coolant capacity and expansion volume
Designed to maintain OE coolant elevation, preventing air pockets
Baffled tank ensures that air pockets cannot be introduced during aggressive driving and provides accurate coolant level reading
Carefully designed bleed passage prevents the introduction of air as the engine cools
Turner engraved internal fill level
TIG welded 5052 aluminum construction
All bungs are machined to fit factory hose ends
Kit contents:

Turner Aluminum Expansion Tank
Coolant level sensor
Expansion tank cap
Heavy duty bleeder screw
Flared coolant pressure release line
Hardware for installation

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OEM Style Hose Clamps
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Turner Motorsport - Corporate Logo
T#:338927
Part#: HOSE-CLAMPS
In Stock
Sale - Save 3% $ 3.99

This product was last offered at the strikethrough price on
06-13-2026

Starting at $ 3.87 USD
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Sale - Save 3%
$ 3.99

This product was last offered at the strikethrough price on
06-13-2026

Starting at $ 3.87 USD
Free Shipping on orders $49 and up
Hose clamps for radiator hoses, coolant hoses, vacuum hoses, or intake hoses. These hose clamps are the same style as your OEM hoses with a smooth inside band to prevent cutting into the hose material.
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Radiator Adjustment Screw / Drain Plug
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URO - Corporate Logo
T#:37959694
Part#: 17107523260
In Stock
$ 56.99 USD
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Constructed from high-strength, heat-resistant plastic, this component is designed to endure extreme temperatures and fluctuating pressure levels, ensuring the cooling system functions optimally and maintains peak efficiency.
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URO Drain Plug With Sleeve - E82/88, E89 Z4, E9X (With an Automatic T...
For vehicles with automatic transmission
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URO - Corporate Logo
T#:7624638
Part#: 17117521781
In Stock
$ 22.98 USD
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$ 22.98 USD
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Commonly broken when opened to drain the radiator.

URO Thermostat - E60, E61, E82, E83, E88, E90, E91, E92, E93, Z4 ...
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URO - Corporate Logo
T#:591812
Part#: 11537549476
In Stock
$ 74.99 USD
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Restore proper function to your cooling system
URO Parts Lower Coolant Hose Assembly - 17127548224
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URO - Corporate Logo
T#:26671649
Part#: 17127548224
In Stock
$ 96.99 USD
$ 96.99 USD

Ensure the longevity and safety of your vehicle's engine by replacing aging plastic and rubber cooling system components. Over time, these parts become weak points, risking engine safety with each mile driven. Dry-rot, splitting, or breaks in cooling hoses can result in antifreeze loss, leading to potential engine overheating. To prevent damage to delicate aluminum engine components, it's recommended to replace engine cooling hoses every 100,000 miles.

Thankfully, URO Parts offers a cost-effective solution to safeguard your engine from potential failure. These high-quality components ensure safe and smooth operation, free of coolant loss or overheating.

Features:

  • Formed hoses for a perfect factory fit
  • Includes hose clamps and brackets for easy installation and routing around engine accessories
  • Temperature and chemical-resistant rubber composition
  • Durable plastic construction

If you're overhauling your BMW's cooling system, replacing this critical lower hose is essential.

URO Parts provides over 8,000 high-quality spare parts, many designed to replace factory BMW components. Their commitment to precision, materials, and workmanship ensures each part meets the highest standards. With a focus on durability, function, and affordability, URO Parts delivers quality replacement components you can trust.

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Coolant Expansion Tank
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URO - Corporate Logo
T#:384250
Part#: 17137640514
In Stock
$ 60.74 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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URO Lower Coolant Hose - Radiator To A/T Oil Cooler - BMW E82/88 E9X ...
For vehicles with automatic transmission only
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T#:43750237
Part#: 17117524710
Ships in 1 Business Day
$ 33.99 USD
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$ 33.99 USD
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This hose runs from the lower coolant pipe on the passenger side of automatic transmission cars.

URO Water Pump - BMW N52 3.0L
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URO - Corporate Logo
T#:39768338
Part#: 11517586925
In Stock
$ 296.99 USD
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If your engine is over heating or you have noticed coolant loss, there is a chance your water pump has failed. This URO replacement is a great option to get your BMW back on the road without breaking the bank.
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URO Cooling O-Ring - E38, E39, E46, E82, E83, E88, E90, E91, E92, E93...
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T#:1196209
Part#: 17111711987
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$ 3.99 USD
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Fits various components in the cooling system
Radiator Carrier - Right
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URO - Corporate Logo
T#:593028
Part#: 17107524914
In Stock
$ 49.99 USD
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Plastic side frame for radiator
Auxiliary Fan Switch O-Ring
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URO - Corporate Logo
T#:377077
Part#: 13621433077S
In Stock
$ 0.88 USD
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Now you can just replace the o-ring instead of the whole switch


Temperature Sensor
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T#:37892090
Part#: 13621433076
In Stock
$ 10.34 USD
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Temperature sensor for monitoring coolant and oil
URO Silicone Coolant Pipe Repair Kit - BMW N52 3.0L
For vehicles with manual transmission
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T#:37757233
Part#: 11537535829RPR
Ships in 1 Business Day
$ 16.99 USD
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$ 16.99 USD
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This silicone coolant pipe repair kit replaces the factory rubber hose section found on the coolant pipe that runs from the engine block to the water pump, BMW p/n 11537535829. The factory rubber hose tends to split over time, leading to coolant loss. Silicone hose lasts significantly longer than rubber hose, ensuring leak-free engine operation for many years.
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URO Coolant Bleeder Screw - Priced Each - BMW E9X F10
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T#:5416748
Part#: 11537793373
In Stock
$ 1.99 USD
Limited Qty Sale
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$ 1.99 USD
Limited Qty Sale
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URO Coolant Bleeder Screw - Priced Each - BMW E9X F10

The URO Coolant Bleeder Screw - Priced Each - BMW E9X F10 is a crucial component for maintaining optimal performance in your BMW's cooling system. When performing routine service, ensuring that all air pockets are removed from the coolant system is vital for proper function. Air pockets in the cooling system can prevent heat from circulating properly, potentially causing issues such as reduced heating efficiency or even engine overheating if trapped behind the thermostat.

  • Ensures proper air removal from the cooling system for improved engine performance
  • Prevents air pockets from interfering with heat circulation and engine cooling
  • Easy installation for an efficient and secure fit
  • Durable construction designed to withstand high pressure and temperature conditions
  • Helps maintain a fully functional cooling system, avoiding overheating and damage
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Coolant Expansion Tank Cap
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T#:373591
Part#: 17117521071
In Stock
$ 18.99

This product was last offered at the strikethrough price on
03-09-2026

$ 14.49 USD
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$ 14.49 USD
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Keep that coolant expansion tank sealed

Rubber Lower Radiator Mount Insert - Priced Each
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T#:593045
Part#: 17117805310
Ships in 1 Business Day
$ 18.99 USD
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Found at the bottom of the radiator
URO Coolant Pipe O-Ring - BMW N52 3.0L
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T#:37892133
Part#: 11517514942
In Stock
$ 2.09 USD
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URO Coolant Pipe O-Ring - BMW N52 3.0L

Engineered to meet OE coolant pipe o-ring dimensions, the URO Coolant Pipe O-Ring ensures easy installation and a perfect fit for BMW N52 3.0L engines. It is designed to resist cooling system heat and antifreeze, providing reliable performance under demanding conditions. Constructed from durable ECD (Electro Chemical Degradation)-resistant EPDM material, it helps prevent electrolysis, extending the lifespan of your cooling system. With a temperature rating of -40º F to 275º F (-40º C to 135º C), this o-ring is built to withstand extreme temperatures. Supported by a 24-month unlimited mileage warranty, it is a dependable solution for maintaining your BMW’s cooling system efficiency.

Key Benefits:

  • Precision-molded to OE dimensions for easy installation and perfect fit.
  • Resists cooling system heat and antifreeze for reliable performance.
  • Durable ECD-resistant EPDM material prevents electrolysis.
  • Temperature rating of -40º F to 275º F for extreme condition durability.
  • Includes a 24-month unlimited mileage warranty for peace of mind.
  • Specifically designed for BMW N52 3.0L engines.
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Auxiliary Fan Switch
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T#:376847
Part#: 13621433077
Back Ordered
$ 10.99 USD
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$ 10.99 USD
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Comes with related o-ring