Bremmen Parts BMW Cooling System Parts & Accessories for BMW 5 Series E39 (1996-2003)

Clear BMW chassis

Please ensure your correct model is selected

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.

Sub-Categories

Sort By:

Thermostat With Housing - 90C
For vehicles with a production date from 09/1998
Bremmen Parts - Corporate Logo
T#:598978
Part#: 11531436386
In Stock
Sale - Save 20% $ 93.99

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

$ 75.06 USD
Free Shipping
Sale - Save 20%
$ 93.99

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

$ 75.06 USD
Free Shipping
A thermostat that opens sooner promotes better cooling in your vehicle. Running a lower temperature thermostat will keep everything much cooler. Keeping the engine cooler will help reduce and improve the life of the seals in your engine, saving you time and money, while also help increase engine performance. A tune might be required to gain the most from this modification, as well as to get your car's ECU accustomed to seeing lower temperatures.
Show More Show Less
Bremmen Parts - Corporate Logo
T#:640141
Part#: 13621433077
In Stock
Sale - Save 20% $ 20.99

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

$ 16.79 USD
Free Shipping on orders $49 and up
Sale - Save 20%
$ 20.99

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

$ 16.79 USD
Free Shipping on orders $49 and up
The auxiliary fan switch activates the auxiliary cooling fan to provide additional cooling under high heat loads, and when the car is stationary
Bremmen Parts - Corporate Logo
T#:26494584
Part#: 11537509227
In Stock
Sale - Save 18% $ 60.99

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

$ 49.99 USD
Free Shipping on orders $49 and up
Sale - Save 18%
$ 60.99

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

$ 49.99 USD
Free Shipping on orders $49 and up

Bremmen Parts - Corporate Logo
T#:36032353
Part#: 17111741167
In Stock
Sale - Save 21% $ 59.99

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

$ 47.32 USD
Free Shipping on orders $49 and up
Sale - Save 21%
$ 59.99

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

$ 47.32 USD
Free Shipping on orders $49 and up

Coolant Expansion Tank - 17111436381
For vehicles with production date from 09/1998
Bremmen Parts - Corporate Logo
T#:36303285
Part#: 17111436381
In Stock
Sale - Save 20% $ 65.99

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

$ 52.79 USD
Free Shipping on orders $49 and up
Sale - Save 20%
$ 65.99

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

$ 52.79 USD
Free Shipping on orders $49 and up

BMW E39 Coolant Expansion Tank is an essential component designed to maintain the proper coolant level in your vehicle's cooling system. Manufactured with high-quality materials, this expansion tank ensures reliable performance and durability, preventing engine overheating by accommodating the expansion of coolant as it heats up. The kit includes a level sensor and cap, providing everything needed for a seamless installation. This expansion tank is specifically engineered to meet the exact specifications of your BMW E39, offering a perfect fit and optimal functionality.

Complete Kit: Includes level sensor and cap for easy installation. High-Quality Construction: Built with durable materials for long-lasting performance. Prevents Overheating: Helps manage coolant expansion, ensuring engine protection. Exact Fit: Designed to meet the precise specifications of your BMW E39. Enhanced Reliability: Ensures proper coolant level maintenance for optimal cooling system function.

Show More Show Less
Bremmen Parts - Corporate Logo
T#:640149
Part#: 11521712058
In Stock
Sale - Save 22% $ 23.99

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

$ 18.76 USD
Free Shipping on orders $49 and up
Sale - Save 22%
$ 23.99

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

$ 18.76 USD
Free Shipping on orders $49 and up
This fan is driven by the serpentine belt, engaged by the fan clutch. If you have bad motor mounts, it's quite common for the blades of this fan to make contact with the radiator or radiator shroud, essentially self-destructing the fan into many pieces. Be sure to get a new fan clutch, while you are replacing this.
Show More Show Less

Bremmen Parts - Corporate Logo
T#:39768309
Part#: 11531741409
In Stock
Sale - Save 22% $ 19.99

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

$ 15.50 USD
Free Shipping on orders $49 and up
Sale - Save 22%
$ 19.99

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

$ 15.50 USD
Free Shipping on orders $49 and up
E39 Lower Radiator Hose - 11531705224
For vehicles with production date from 09/1998
Bremmen Parts - Corporate Logo
T#:36100127
Part#: 11531705224
In Stock
Sale - Save 21% $ 36.99

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

$ 29.37 USD
Free Shipping on orders $49 and up
Sale - Save 21%
$ 36.99

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

$ 29.37 USD
Free Shipping on orders $49 and up
Over time, and with prolonged exposure to high-temperature coolant, the hoses in your vehicle's cooling system endure significant wear and tear. Made from reinforced rubber, these hoses can fail in various ways, including splitting near hose clamps, swelling, cracking, or even rupturing completely. Any of these failures can lead to coolant loss and leave you stranded. Replace your coolant hoses at the first sign of wear to ensure your engine stays properly cooled and running reliably.
Show More Show Less

E39 Upper Radiator Hose - 11531705223
For vehicles with production date from 09/1998
Bremmen Parts - Corporate Logo
T#:36100154
Part#: 11531705223
In Stock
Sale - Save 20% $ 46.99

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

$ 37.53 USD
Free Shipping on orders $49 and up
Sale - Save 20%
$ 46.99

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

$ 37.53 USD
Free Shipping on orders $49 and up

Over time, prolonged exposure to high-temperature coolant can take a toll on your vehicle's hoses. Made from reinforced rubber, these hoses are prone to wear and failure in various ways, including splitting at hose clamps, swelling, cracking, or breaking. Any of these issues can lead to coolant loss and potentially leave you stranded. Replacing your hoses at the first sign of wear is essential to maintaining a properly functioning cooling system.

This replacement hose is designed with the correct diameter, bends, and length for a precise fit, making it an ideal solution for swelled or damaged hoses. With straightforward installation, this hose provides peace of mind, whether you're embarking on a long road trip or simply commuting to work.

When replacing your radiator hose, some coolant loss is unavoidable. Browse our website to find the exact replacement coolant and other parts for your vehicle, delivered straight to your door. Don’t forget to order a new thermostat housing as well—factory plastic units often crack or warp during removal, and replacing them ensures a complete and reliable repair.

Show More Show Less

Bremmen Parts - Corporate Logo
T#:640140
Part#: 17111712788
In Stock
Sale - Save 39% $ 3.99

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

$ 2.44 USD
Free Shipping on orders $49 and up
Sale - Save 39%
$ 3.99

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

$ 2.44 USD
Free Shipping on orders $49 and up
Plastic bleeder screw for cooling system is used to bleed air that would otherwise create an air pocket and lead to overheating. Includes o-ring seal.
Bremmen Parts - Corporate Logo
T#:15511816
Part#: 11531436386
Ships in 8 Business Days
Sale - Save 4% $ 30.99

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

$ 29.67 USD
Free Shipping on orders $49 and up
Sale - Save 4%
$ 30.99

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

$ 29.67 USD
Free Shipping on orders $49 and up
A thermostat that opens sooner promotes better cooling in your vehicle. Running a lower temperature thermostat will keep everything much cooler. Keeping the engine cooler will help reduce and improve the life of the seals in your engine, saving you time and money, while also help increase engine performance. A tune might be required to gain the most from this modification, as well as to get your car's ECU accustomed to seeing lower temperatures.
Show More Show Less
Bremmen Parts Thermostat Assembly - E38, E39
For vehicles with production date up to 09/1998
Bremmen Parts - Corporate Logo
T#:388457
Part#: 11531437526
Back Ordered
Sale - Save 15% $ 56.99

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

$ 48.44 USD
Free Shipping on orders $49 and up
Sale - Save 15%
$ 56.99

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

$ 48.44 USD
Free Shipping on orders $49 and up
Comes with aluminum housing, o-ring & sensor