BMW Cooling System Parts & Accessories for BMW 7 Series E66 (2002-2008)

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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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Uro Premium Collapsible Water Pipe Kit - N73 N74 6.0L
Uro Premium Collapsible Water Pipe Kit - N73 N74 6.0L
2X Entries Into Our F80 M3 Sweepstakes
URO Premium - Corporate Logo
T#:383328
Part#: 11147500355
Ships in 1 Business Day
$ 421.99 USD
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$ 421.99 USD
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The N73/74 V12 engine water pipes could often fail at lower mileages, leaking a ton of coolant and prevent coolant flow to the rear of the engine block. If not addressed immediately, this could lead to engine overheating and complete failure. Unfortunately, these pipes are also very expensive and time consuming to replace when using the stock water pipe due to the amount of labor time needed for tear down and installation. This URO Premium collapsible water pipe kit is the perfect replacement to cut down on installation time by removing the need to tear down the front end of the engine before installing this part, potentially saving you thousands of dollars at a shop or a ton of hours in your own garage. 

Fits the following BMW engines:
N73, N74

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URO Engine Collapsible Cooling Pipe - E60 E63 E65 E53 E70 N62
URO Engine Collapsible Cooling Pipe - E60 E63 E65 E53 E70 N62 ...
2X Entries Into Our F80 M3 Sweepstakes
URO Premium - Corporate Logo
T#:180693
Part#: 11141439975R
In Stock
$ 300.67 USD
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$ 300.67 USD
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NOW LOCATED UNDER T#338249
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
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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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