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BMW Cooling System Parts & Accessories

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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Gates - Corporate Logo
T#:394624
Part#: 11537836155
Ships in 3 Business Days
$ 78.99 USD
Free Shipping on orders $49 and up
Performance low-temperature thermostat for E90, E92, E93 M3 - S65 engine- E60 M5 E63 M6 with S85 engine. Your car may still operate fine according to the instrument display but the electrically-operated thermostat may be going bad.
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Active Autowerke - Corporate Logo
T#:397222
Part#: 14-009
In Stock
$ 56.99

This product was last offered at the strikethrough price on
06-18-2026

$ 52.99 USD
Limited Qty Sale
Free Shipping on orders $49 and up
$ 56.99

This product was last offered at the strikethrough price on
06-18-2026

$ 52.99 USD
Limited Qty Sale
Free Shipping on orders $49 and up
Plastic thermostat housing cracked on your M50?

Here are your choices: you can wait for the plastic factory thermostat housing cover to break and cause major overheating. (Even with a new stock cover, it won’t take long.) Or you can install a thoughtfully engineered all-aluminum thermostat housing cover from Active Autowerke and never experience this type of failure again. Currently there is no factory upgraded part to this problem. This is an aluminum extruded part that has all of the openings machine properly to fit like factory; from the mounting bolt holes, the seating of the thermostat to the sealing opening for the ORANGE gasket. Forged to exact factory tolerances, everything fits and this unit is a true easy bolt-on – especially suited for racing or load conditions like heavy traffic, where engine temp can rise rapidly. The housing is guaranteed never to break from overheating or over-tightening, and its CNC machined surface ensures a precise seat.

Unit comes complete with a new ORANGE sealing gasket; a new thermostat is recommended but not included.
For hotter climates, a 71 degree thermostat is recommended over the 82 degree unit.

Anything and everything BMW is the mantra at Active Autowerke. Since 1981 they have been serving the BMW community with custom turbocharger kits to a myriad of other innovative and inspiring performance parts.
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Gates - Corporate Logo
T#:592003
Part#: 17127540127
Ships in 3 Business Days
$ 55.99 USD
Free Shipping on orders $49 and up
The hose that comes off of the top outlet on the radiator

Active Autowerke - Corporate Logo
T#:397219
Part#: 14-010
Ships in 2 Business Days
5% off MSRP $ 259.00

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 246.99 USD
Free Shipping
5% off MSRP
$ 259.00

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 246.99 USD
Free Shipping

When you push your powerplant, thermodynamics push right back. The toll of high performance is higher heat load – and many stock components begin to complain. But Active Autowerke has you covered - this upgraded fan clutch increases viscous coupling of cooling fan blade speed to water pump speed, yielding increased airflow through the radiator for more efficient cooling. A simple, yet wonderful, thing.

This product fits the following BMWs:
1992-1999 E36 323i 325i 328i 330i M3
1998-2006 E46 323i 325i 328i 330i M3

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Gates - Corporate Logo
T#:340651
Part#: 17127531581
In Stock at Vendor
$ 74.99

This product was last offered at the strikethrough price on
05-07-2026

$ 71.99 USD
Free Shipping
$ 71.99 USD
Free Shipping
Take care of your cooling system - replace old hoses
Gates - Corporate Logo
T#:362198
Part#: 17127564478
In Stock at Vendor
$ 68.99

This product was last offered at the strikethrough price on
05-07-2026

$ 66.99 USD
Free Shipping on orders $49 and up
$ 66.99 USD
Free Shipping on orders $49 and up
Replace split, hard, or bulging hoses

Gates - Corporate Logo
T#:363924
Part#: 11533400207
In Stock at Vendor
$ 68.99

This product was last offered at the strikethrough price on
05-07-2026

$ 66.99 USD
Free Shipping on orders $49 and up
$ 66.99 USD
Free Shipping on orders $49 and up
Aftermarket replacement
Gates - Corporate Logo
T#:592901
Part#: 11531276541
In Stock at Vendor
$ 21.99

This product was last offered at the strikethrough price on
05-07-2026

$ 21.00 USD
Free Shipping on orders $49 and up
$ 21.00 USD
Free Shipping on orders $49 and up
Hose that connects the thermostat to the temperature time switch housing

Active Autowerke - Corporate Logo
T#:2302749
Part#: 14-016
Ships in 10 Business Days
$ 141.99 USD
Free Shipping
$ 141.99 USD
Free Shipping
CNC machined coolant/water thermostat bypass tube to improve flow on and off the track. Easy plug and play installation and a durable anodized coating make this a simple and reliable temperature control solution.
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Gates - Corporate Logo
T#:591753
Part#: 11531279895
Ships in 10 Business Days
$ 29.99

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

$ 26.99 USD
Free Shipping on orders $49 and up
$ 26.99 USD
Free Shipping on orders $49 and up
Replace your radiator hose before a blown hose leaves you stranded
Gates - Corporate Logo
T#:591754
Part#: 11531286914
Ships on Aug 7, 2026
$ 21.99 USD
Free Shipping on orders $49 and up
$ 21.99 USD
Free Shipping on orders $49 and up
Hose from radiator to water pump
Gates - Corporate Logo
T#:592163
Part#: 17122754223
Ships on Aug 7, 2026
$ 41.99 USD
$ 41.99 USD


Gates - Corporate Logo
T#:591787
Part#: 11531730351
Ships on Aug 7, 2026
$ 51.99 USD
Free Shipping on orders $49 and up
Attaches the expansion tank to the heater return hose
Gates - Corporate Logo
T#:1673
Part#: 17127510952
Ships on Aug 7, 2026
$ 53.99 USD
Free Shipping on orders $49 and up

 


This upper radiator hose fits the following BMWs:
1999-2000 E46 3 Series Sedan/Wagon - 323i & 328i
1999-2000 E46 3 Series Coupe/Conbertible - 323Ci & 328Ci
2001-2005 E46 3 Series Sedan/Wagon - 325i, 325xi, 330i, 330xi
2001-2006 E46 3 Series Coupe/Convertible - 325Ci, 330Ci

 

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Gates - Corporate Logo
T#:591765
Part#: 11531438633
Ships on Aug 7, 2026
$ 47.99 USD
Free Shipping on orders $49 and up
$ 47.99 USD
Free Shipping on orders $49 and up
Runs from the expansion tank to auxiliary water pump

Gates - Corporate Logo
T#:591752
Part#: 11531278045
Ships on Aug 7, 2026
$ 23.99 USD
Free Shipping on orders $49 and up
Replace your radiator hose before a blown hose leaves you stranded.

Gates - Corporate Logo
T#:362110
Part#: 11537830716
In Stock at Vendor
$ 48.99

This product was last offered at the strikethrough price on
05-07-2026

$ 46.99 USD
Free Shipping on orders $49 and up
$ 46.99 USD
Free Shipping on orders $49 and up
Connects the radiator to the thermostat housing
Gates - Corporate Logo
T#:591785
Part#: 11531726344
In Stock at Vendor
$ 40.99

This product was last offered at the strikethrough price on
05-07-2026

$ 39.99 USD
Free Shipping on orders $49 and up
$ 39.99 USD
Free Shipping on orders $49 and up
Replace your radiator hose before a blown hose leaves you stranded.

Active Autowerke - Corporate Logo
T#:5886968
Part#: 15-012
Ships in 3 Business Days
$ 2,849.99 USD
Free Shipping
$ 2,849.99 USD
Free Shipping
BMW's S55 motor is a modern marvel but one weak point, which Active identified is the entire cooling system for the intake which comprises the charge pipe, the aftercooler and the heat exchanger (or radiator). Finally there is a S55 aftercooler kit upgrade that is good enough to carry the Active Autowerke brand. Years of success in developing cars for motorsport has allowed Active to leverage its expertise to the top-mount charge air cooler on the F80 M3, F82 M4 and F87 M2 Competition. This aftercooler was made for the S55 and crafted using only high-grade aluminum to outperform the factory aftercooler in all situations from everyday driving to the toughest racing. The factory cooler was built to support a specific power target and environment. Many of you have increased the performance of the S55 which quickly overwhelms the stock cooler leading to heat soak and higher intake air temperatures which triggers the ECU to downgrade the performance until cooler air returns. Active's focus was not on a mass-market aesthetic add-on but a properly engineered improvement over the existing hardware. Active uses a tube-and-fin core designed specifically for the S55 and included turbulators to maximize the cooling efficiency in as small a package as possible. The end tanks are billet machined aluminum, not cast, folded, or bonded and ensure even distribution of the water throughout the internal aftercooler cores. High precision fittings, CNC machining, and TIG welding throughout ensures the highest quality construction to prevent pressure loss, and the lowest weight, in a bolt-on replacement. But Active also didn’t leave the aesthetics by the wayside as we dip the visible top of the aftercooler in a carbon fiber coating giving your installed cooling system a decidedly top market look to match the improved cooling performance. The Active silicone charge pipes for the F80 M3, F82/F83 M4 and the F87 M2 Competition improve the flow over the stock, compressed plastic pipes. The Active Silicone Charge Pipes allow you to maximize power on your F8X by securing all the boost that your S55 is making. These pipes replace the hot-side pipes leaving the turbos and into the top-mount aftercooler. The stock S55 charge pipes are notorious for developing hairline fractures at their plastic seams. These fractures or cracks are unnoticeable to the naked eye, but under boost pressure they open up leaking the desired charged air into the engine bay, and consequently can rob your S55 of it's full power potential. In addition, these leaks can trigger your S55's turbochargers to work harder to hit and maintain target boost pressure, potentially wearing them out sooner. Active uses silicone in this area because it will not contribute to heat soak and it's easier to mold for the correct clearances. Active uses a 5-layer silicone hose with all needed adapters and stainless hose clamps included. It fits perfectly with our CNC’d top-mount cooler.
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Gates - Corporate Logo
T#:592891
Part#: 11517563659
Ships on Aug 7, 2026
$ 759.99 USD
Free Shipping
$ 759.99 USD
Free Shipping

BMW N54 N55 Water Pump ensures reliable cooling performance for your BMW's engine. This high-quality water pump is designed for late-model N54 and N55 engines, offering enhanced reliability and ease of service. Unlike older models, it does not require a gasket or o-ring, simplifying installation and maintenance. Replacing worn water pumps during routine cooling system services is crucial for maintaining optimal engine performance and preventing overheating issues.

  • Enhanced reliability for peace of mind
  • Easy installation and serviceability
  • No need for gasket or o-ring
  • Maintains optimal engine cooling efficiency
  • Designed specifically for BMW N54 and N55 engines

Ensure your BMW's engine stays cool and performs efficiently with the BMW N54 N55 Water Pump.

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Gates - Corporate Logo
T#:592181
Part#: 17127515501
Ships on Aug 7, 2026
$ 124.99 USD
Free Shipping on orders $49 and up
$ 124.99 USD
Free Shipping on orders $49 and up

Gates - Corporate Logo
T#:591784
Part#: 11531722852
Ships on Aug 7, 2026
$ 15.99 USD
Free Shipping on orders $49 and up
Hose from radiator to thermostat housing
Gates - Corporate Logo
T#:553629
Part#: 64116910544
Ships on Aug 7, 2026
$ 280.00 USD
Free Shipping
$ 280.00 USD
Free Shipping
With additional water pump
Gates - Corporate Logo
T#:591774
Part#: 11531717622
Ships on Aug 7, 2026
$ 17.99 USD
Free Shipping on orders $49 and up
A common source of cooling system failure


Gates - Corporate Logo
T#:401921
Part#: 11531708499
Ships on Aug 7, 2026
$ 39.99 USD
Free Shipping on orders $49 and up
New upper radiator hose for your BMW
Gates - Corporate Logo
T#:385314
Part#: 11531436988
Ships on Aug 7, 2026
$ 37.99 USD
Free Shipping on orders $49 and up
Serves as a supply line to the radiator
Gates - Corporate Logo
T#:9642134
Part#: 17127535901
Ships on Aug 7, 2026
$ 30.99 USD
Free Shipping on orders $49 and up

Gates - Corporate Logo
T#:591715
Part#: 11511719836
Ships on Aug 7, 2026
$ 122.99 USD
Free Shipping on orders $49 and up
$ 122.99 USD
Free Shipping on orders $49 and up
Includes gasket. New - not remanufactured!

Gates - Corporate Logo
T#:9642133
Part#: 17122754573
Ships on Aug 7, 2026
$ 44.99 USD
Free Shipping on orders $49 and up
Gates - Corporate Logo
T#:593004
Part#: 13541719967
Ships on Aug 7, 2026
$ 13.99 USD
Free Shipping on orders $49 and up
$ 13.99 USD
Free Shipping on orders $49 and up
Throttle housing small hose

Gates - Corporate Logo
T#:591790
Part#: 11531738054
Ships on Aug 7, 2026
$ 64.99 USD
Free Shipping
$ 64.99 USD
Free Shipping
Replace your leaking hose
Gates - Corporate Logo
T#:593065
Part#: 17127537108
Ships on Aug 7, 2026
$ 66.99 USD
Free Shipping on orders $49 and up

Gates - Corporate Logo
T#:591781
Part#: 11531722215
Ships on Aug 7, 2026
$ 42.99 USD
Free Shipping on orders $49 and up
Upper hose that connects your radiator to the flange

Gates - Corporate Logo
T#:557799
Part#: 11531287682
Ships on Aug 7, 2026
$ 15.99 USD
Free Shipping on orders $49 and up
Replace your radiator hose before a blown connection leaves you stranded
Gates - Corporate Logo
T#:637163
Part#: 11531486703
Ships on Aug 7, 2026
$ 6.99 USD
Free Shipping on orders $49 and up
$ 6.99 USD
Free Shipping on orders $49 and up
Gates - Corporate Logo
T#:393494
Part#: 11537601158
Ships on Aug 7, 2026
$ 108.99 USD
Free Shipping on orders $49 and up


Gates - Corporate Logo
T#:592918
Part#: 11531718982
Back Ordered
$ 20.99 USD
Free Shipping on orders $49 and up
Connects between the Water pump and the thermostat
Gates - Corporate Logo
T#:596346
Part#: 64211380527
Back Ordered
$ 18.99 USD
Free Shipping on orders $49 and up
Inlet hose to the heater core
Gates - Corporate Logo
T#:591777
Part#: 11531720678
Back Ordered
$ 18.99 USD
Free Shipping on orders $49 and up
Hose from radiator to water pump

Gates - Corporate Logo
T#:592903
Part#: 11531287651
Back Ordered
$ 20.99 USD
Free Shipping on orders $49 and up
From water pump to thermostat housing

Gates - Corporate Logo
T#:596352
Part#: 64218387521
Back Ordered
$ 64.99 USD
Free Shipping on orders $49 and up
From heater core to engine