BMW Cooling System Parts & Accessories for BMW X Series E83 (2004-2010)

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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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Genuine BMW - Corporate Logo
T#:361022
Part#: 11517586925
Ships in 1-2 days
8% off MSRP $ 828.99

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$ 758.99 USD
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8% off MSRP
$ 828.99

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

$ 758.99 USD
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Don't take your car's cooling system for granted. A waterpump failure can cost you an engine, which is why preventatively replacing your BMWs waterpump and refreshing the cooling system every 60,000 miles. The water pump is a weak point is the cooling system. Replacing your waterpump will go a long way for keeping your car on the road and operating properly. This water pump fits many 2006 and newer BMW 6 cylinder engines, specifically all the BMWs with the N51, N52, N53 engines. You will also need to purchase replacement aluminum screws Part #11510392553 This water pump fits the following BMWs: 2008-20xx E82 128i 2006-2006 E90 325i sedan, 330i sedan, 325xi sedan, 330xi sedan 2007-2012 E90 328i sedan, 328xi sedan, 328i xDrive sedan 2007-2012 E92 328i coupe, 328xi coupe, 328i xDrive coupe 2007-2012 E93 328i Convertible 2006-2006 E60 525i, 525xi, 530i, 530xi 2007-2010 E60 528i, 528xi, 528i xDrive 2007-2010 E83 X3 3.0i X3 3.0si 2007-20xx E70 X5 3.0si X5 xDrive30i 2006-2008 E85 Z4 3.0si 2009-20xx E89 Z4 sDrive30i
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Genuine BMW - Corporate Logo
T#:150714
Part#: 64213400417
Ships in 1-2 days
5% off MSRP $ 62.99

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$ 59.99 USD
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5% off MSRP
$ 62.99

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

$ 59.99 USD
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Genuine BMW Hose F Radiator And Expansion Tank -
This item fits the following BMW Chassis:
E83 X3

Genuine BMW - Corporate Logo
T#:45889
Part#: 17117514400
Ships in 1-2 days
4% off MSRP $ 23.99

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

$ 22.99 USD
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4% off MSRP
$ 23.99

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

$ 22.99 USD
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Genuine BMW Gasket Right
This item fits the following BMW Chassis:
E85 Z4M,E83 X3,E85 Z4,E86 Z4

Fits BMW Engines including:
M54,N51,N52,N52N,S54

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Genuine BMW - Corporate Logo
T#:7458
Part#: 17123413819
Ships in 1-2 days
6% off MSRP $ 108.99

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$ 102.99 USD
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$ 108.99

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$ 102.99 USD
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Genuine BMW Coolant Hose -
This item fits the following BMW Chassis:
E83 X3

Fits BMW Engines including:
M54


Genuine BMW - Corporate Logo
T#:22527
Part#: 17123422785
Ships in 1-2 days
6% off MSRP $ 99.99

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

$ 93.99 USD
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6% off MSRP
$ 99.99

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

$ 93.99 USD
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Genuine BMW Coolant Hose -
This item fits the following BMW Chassis:
E83 X3

Fits BMW Engines including:
N52N

Genuine BMW - Corporate Logo
T#:45927
Part#: 17117545783
Ships in 1-2 days
4% off MSRP $ 26.99

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

$ 25.99 USD
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4% off MSRP
$ 26.99

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$ 25.99 USD
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Genuine BMW Radiator Adjusting Screw, Automatic -
This item fits the following BMW Chassis:
E83 X3,E85,E86

Fits BMW Engines including:
N52,N52N

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Genuine BMW - Corporate Logo
T#:378882
Part#: 11517586925KT4
Ships in 1-2 days
$ 1,064.99 USD
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$ 1,064.99 USD
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Genuine BMW Water Pump And Thermostat Kit is designed to address the common issue of water pump failure in BMW models around 80,000 miles. This comprehensive kit provides everything needed for a seamless water pump and thermostat replacement, ensuring your BMW continues to perform at its best without leaving you stranded.

This kit includes a Genuine BMW water pump, thermostat, coolant, and all necessary mounting hardware, offering a reliable solution to restore your engine's cooling system. Perfect for preventative maintenance, this Genuine BMW kit helps prevent overheating and ensures optimal engine performance.

  • Genuine BMW parts for precise fitment and reliability
  • Complete kit for water pump and thermostat replacement
  • Helps prevent common water pump failures around 80,000 miles
  • Includes all required mounting hardware for easy installation
  • Enhances engine cooling efficiency and longevity
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Genuine BMW - Corporate Logo
T#:46145
Part#: 17123448462
Ships in 1-2 days
6% off MSRP $ 194.99

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

$ 182.99 USD
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6% off MSRP
$ 194.99

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

$ 182.99 USD
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Genuine BMW Hose F Radiator And Engine Return -
This item fits the following BMW Chassis:
E83 X3

Fits BMW Engines including:
N52N


Genuine BMW - Corporate Logo
T#:36005
Part#: 11537535829
Ships in 3 Business Days
5% off MSRP $ 215.99

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

$ 205.99 USD
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$ 215.99

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$ 205.99 USD
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This is the Genuine BMW coolant pump inlet pipe for cars with the N52 6 cylinder engine and manual transmission.

This item fits the following BMWs:
2008+ E82 BMW 128i - Only for Manual Trans
2006-2011 E90 BMW 325i 325xi 328i 328xi 328i xDrive 330i 330xi - Sedan - Only for Manual Trans
2006-2012 E91 BMW 325xi 328i 328xi 328i xDrive - Wagon - Only for Manual Trans
2007-2013 E92 BMW 328i 328xi 328i xDrive - Coupe - Only for Manual Trans
2007-2013 E93 BMW 328i - Convertible - Only for Manual Trans
2006-2010 E83 BMW X3 3.0i X3 3.0si - Only for Manual Trans
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Bremmen Parts Heater Hose - Supply - E83
10X Entries Into Our F80 M3 Sweepstakes
Bremmen Parts - Corporate Logo
T#:1195974
Part#: 64213400415
Ships in 1-2 days
Sale - Save 5% $ 43.85

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

$ 41.66 USD
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Sale - Save 5%
$ 43.85

This product was last offered at the strikethrough price on
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$ 41.66 USD
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Feeds coolant from the engine to the heater valve.
Genuine BMW - Corporate Logo
T#:22325
Part#: 11537516414
Ships in 1-2 days
5% off MSRP $ 215.99

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

$ 205.99 USD
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5% off MSRP
$ 215.99

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

$ 205.99 USD
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This is the Genuine BMW coolant pump inlet pipe for cars with the N52 6 cylinder engine.

This item fits the following BMWs:
2008+ E82 BMW 128i - Only for Auto Trans
2006-2011 E90 BMW 325i 325xi 328i 328xi 328i xDrive 330i 330xi - Sedan - Only for Auto Trans
2006-2012 E91 BMW 325xi 328i 328xi 328i xDrive - Wagon - Only for Auto Trans
2007-2013 E92 BMW 328i 328xi 328i xDrive - Coupe - Only for Auto Trans
2007-2013 E93 BMW 328i - Convertible - Only for Auto Trans
2006-2010 E60 BMW 525i 525xi 530i 530xi 528i 528xi 528i xDrive
2006-2010 E83 BMW X3 3.0i X3 3.0si - Only for Auto Trans
2006-2008 E85 BMW Z4 3.0i Z4 3.0si
2009+ Z4 BMW Z4 sDrive30i
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Genuine BMW Motorsport - Corporate Logo
T#:1171
Part#: TMS1171
Ships in 7 Business Days
$ 415.45 USD
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$ 415.45 USD
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This is a genuine BMW Motorsport part, designed specifically for BMW racing applications. We use this exact thermostat setup in our Championship-winning E46 330i race car. It is designed to be used on all M54 and M52TU double-VAN0S engines, as used in the 1999-2000 E46 323/328 and 2001-2005 E46 325/330. This 60 degree C (140 defrees F) thermostat comes complete with plastic thermostat housing. It does not use the plug and wiring for the stock DME so this should only be used with an aftermarket engine management system (Motec, Bosch, etc).

When doing any sort of repair or maintenance there is no replacement for genuine factory parts. Turner Motorsport carries the Genuine BMW brand with pride and has the parts you need to complete your next project with confidence.
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Heater Inlet Pipe
We Price Match - Give Us A Call or Chat!
Febi - Corporate Logo
T#:594084
Part#: 11531705210
Ships on Oct 29, 2026
$ 47.46 USD
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Runs from the front left side of the engine to the heater inlet
CTA Tools - Corporate Logo
T#:641760
Part#: CTAA878
Ships on Oct 29, 2026
$ 23.57 USD
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Use to remove and install Fan Clutch Assemblies when replacing Water Pumps or doing other Engine Services
Bremmen Parts Water Pipe Connector - E83, Z4
10X Entries Into Our F80 M3 Sweepstakes
Bremmen Parts - Corporate Logo
T#:1195932
Part#: 17112248409
Ships on Oct 29, 2026
Sale - Save 3% $ 31.61

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

$ 30.66 USD
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Sale - Save 3%
$ 31.61

This product was last offered at the strikethrough price on
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$ 30.66 USD
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Located underneath the expansion tank

BMW Radiator Expansion Tank Pressure Fitting
Requires the use of a Motive Power Bleeder, sold separately
Motive - Corporate Logo
T#:380462
Part#: 1175
Ships in 8 Business Days
$ 24.99 USD
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Allows you to check for leaks in the coolant system

Enthusiast Bundles - Corporate Logo
T#:37419798
Part#: 008363LA02EB1KT
Ships on Dec 28, 2026
Sale - Save 24% $ 1,055.95

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

$ 799.04 USD
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Sale - Save 24%
$ 1,055.95

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

$ 799.04 USD
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Take your BMW’s cooling system to the next level with this Turner Motorsport Cooling Upgrade Kit. Featuring a Heavy-Duty Aluminum Expansion Tank and a Mechanical Thermostat Conversion Kit, this combo is engineered to deliver ultimate reliability and superior performance for M52TU/M54 engines. Say goodbye to the cooling system failures common in stock setups—Turner Motorsport has you covered.

Turner Motorsport M52TU/M54 Heavy-Duty Expansion Tank Kit

The Turner Motorsport Aluminum Expansion Tank is a premium upgrade designed to replace the fragile factory plastic tank, which is known to crack, leak, or even explode. Crafted for durability, this tank’s all-aluminum construction with wrinkle black powder coating ensures this is the last expansion tank you’ll ever need.

Why Upgrade? The factory plastic tanks on BMW M52TU/M54 engines are notorious for failure under heat and pressure. Avoid the risk of being stranded on the side of the road with a mess of coolant—Turner Motorsport’s aluminum expansion tank is built to withstand years of demanding use and intense heat cycles.

Key Features and Benefits:

Complete Kit: Includes Turner Aluminum Expansion Tank, coolant level sensor, expansion tank cap, and flared coolant pressure release line. OEM Fit & Capacity: Direct fit with no modifications, maintains stock coolant capacity and expansion volume. Baffled Design: Prevents air pockets during aggressive driving and ensures accurate coolant level readings. Premium Construction: TIG-welded 5052 aluminum with machined fittings for factory hose compatibility. Turner Motorsport M52TU/M54 Mechanical Thermostat Conversion Kit

Replace your problematic factory plastic thermostat housing with Turner Motorsport’s high-quality billet aluminum Thermostat Conversion Kit. This upgrade not only provides increased reliability but also allows for thermostat swaps to suit specific temperature requirements, making it ideal for daily drivers and track cars alike.

Why Make the Switch? The factory plastic thermostat housing with its built-in thermostat is prone to cracking and requires the whole unit to be replaced during maintenance. Turner’s conversion kit changes the game by providing a durable billet housing with a replaceable thermostat for flexibility and lower maintenance costs.

Key Features and Benefits:

Increased Reliability: Uses an M50/S50 mechanical thermostat, including an 80°C thermostat for enhanced cooling control. Customizable: Includes barbed hose connections for standard E46 M3 hoses and -16 ORB connections for custom hoses. Engineered to Last: CNC-machined from billet 6061 aluminum and black anodized for corrosion resistance. Enhanced Sealing: Features a Viton gasket for superior durability and sealing performance. Kit Includes:

6061 Billet Aluminum Thermostat Housing 80°C Mechanical Thermostat Thermostat Housing Gasket Thermostat Harness ECS Silicone E46 M3 Cooling Hoses Turner Motorsport Precision Engineering & Product Development

Every component in this cooling upgrade kit has been rigorously designed, engineered, and tested by Turner Motorsport’s Research and Development team. Using state-of-the-art technology such as FARO laser scanning, SolidWorks 3D modeling, and in-house rapid prototyping, Turner ensures that these products meet the highest standards of quality, precision, and durability.

Upgrade your BMW with confidence—Turner Motorsport is your partner in performance and reliability.

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Water Pump and Seal - with upgraded metal impeller - MEYLE
5X Entries Into Our F80 M3 Sweepstakes
We Price Match - Give Us A Call or Chat!
Meyle - Corporate Logo
T#:579324
Part#: 11517509985
Ships on Nov 4, 2026
$ 52.99 USD
Free Shipping on orders $49 and up

Ensure the optimal performance of your BMW by addressing the crucial component of the water pump. Turner Motorsport provides high-quality water pumps designed to keep coolant flowing smoothly. If left unchecked, a failing water pump can lead to overheating issues, potentially causing damage to engine internals. Common among German vehicles, water pump failure may result in unnecessary visits to the repair shop. Preventive maintenance, especially during timing belt replacements, is essential to avoid rapid coolant temperature rise and potential engine damage.

  • Prevents overheating issues
  • Guards against engine damage
  • Common replacement during timing belt maintenance
  • Ensures smooth coolant flow for optimal engine performance
  • Options for thermostats available on Turner Motorsport's website
  • Convenient coolant replacement options
  • Recommended replacement around 60,000 miles
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Vargas Turbo Technologies - Corporate Logo
T#:7530033
Part#: COOLANTCAPBLK
Ships on Oct 28, 2026
$ 79.99 USD
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$ 79.99 USD
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VTT is proud to offer their billet replacement for the factory plastic Coolant Reservoir cap. This cap does away with the weak plastic cap while adding some pop, and color to your engine bay. This coolant cap retains ALL of the factory provisions by simply allowing you to snap the factory pressure-relief into the new Billet Cap. VTT also designed these caps to complement their N5X Billet Oil caps, N5XBillet Oil filter housing caps, and Billet Power Steering cap, so all 4 will have the same design. These caps are offered in 4 colors – Red, Black, Blue, and Clear anodized Replaces Genuine BMW Reservoir Cap # 17117639020 Note: Fitment includes 99% of all BMW with a coolant Reservoir tank from the E series forward, meaning then fit even the brand New G8X M3/4 with the S58, all B58, etc. If your BMW is an E90 or newer this cap most likely will fit
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OEM Rein Lower Radiator Hose - E83 X3
2X Entries Into Our F80 M3 Sweepstakes
Rein - Corporate Logo
T#:379773
Part#: 17123424499
Back Ordered
$ 36.99 USD
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Over time, coolant hoses begin to get brittle and are susceptible to cracking and splitting. Replace your cracked or leaking coolant hose to prevent further leaks and potentially catastrophic failure.

Bremmen Parts - Corporate Logo
T#:640140
Part#: 17111712788
Ships on Jan 11, 2027
Sale - Save 39% $ 3.99

This product was last offered at the strikethrough price on
09-02-2026

$ 2.44 USD
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Sale - Save 39%
$ 3.99

This product was last offered at the strikethrough price on
09-02-2026

$ 2.44 USD
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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.

Febi - Corporate Logo
T#:392570
Part#: 11537521049
Ships in 2 Business Days
$ 17.99

This product was last offered at the strikethrough price on
05-06-2026

$ 16.99 USD
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$ 16.99 USD
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Connects from the water pump to the thermostat
Genuine BMW - Corporate Logo
T#:7432
Part#: 17111712788
In Stock
$ 5.94 USD
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This is the Genuine BMW Coolant bleeder screw. We recommend a heavy duty Aluminum replacement from ECS Tuning if you do not want to replace this part again when it fails.


Genuine BMW Vent Screw
This item fits the following BMW Chassis:
E36 M3,E46 M3,E85 Z4M,E53 48IS,E30,E34,E36,E38,E39,E46,E53 X5 X5,E83 X3,E85 Z4,E86 Z4,E90
 

 

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OEM Rein Coolant Pipe Inlet Hose Section - N52
2X Entries Into Our F80 M3 Sweepstakes
Rein - Corporate Logo
T#:388662
Part#: 11537516414
In Stock
$ 19.99 USD
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Cooling hoses tend to crack over time after going through countless heating and cooling cycles. This can lead to leaks or air bubbles in the cooling system that lead too coolant loos, hurts cooling potential, or could possibly cause damage from excess heat.

Fits the following BMWs:
Submodels with N52 3.0L engine.

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Genuine BMW - Corporate Logo
T#:11526
Part#: 82142209769
In Stock
$ 10.60

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

$ 10.57 USD
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$ 10.57 USD
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This 1 liter bottle is perfect for topping of the coolant in your BMW. This is The use of Original BMW Anti-Freeze/Coolant will ensure sufficient cooling in summer and protection against freeze-ups in winter. BMW Antifreeze/Coolant will also guard your vehicle's various engine components against corrosion. BMW Anti-Freeze/ Coolant will prevent excessive silicate gel precipitation, which may cause plugging of the cooling system and lead to more extensive repairs.
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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
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$ 11.89 USD
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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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Schwaben - Corporate Logo
T#:361021
Part#: DO-3236
In Stock
Sale - Save 25% $ 25.99

This product was last offered at the strikethrough price on
05-02-2026

$ 19.49 USD
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Sale - Save 25%
$ 25.99

This product was last offered at the strikethrough price on
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$ 19.49 USD
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Why buy two tools when you can get one that will do many jobs like this open end wrench? It is great for removing and installing the fan clutch and plastic oil filter cap. Also works great for removing and installing the VAN0S solenoid on M50 engine family. Use the same tools the Turner Motorsport tech's use!

Features:

  • Made of Chrome Vanadium Steel for strength
  • 32/36mm open end sides

 

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Genuine BMW - Corporate Logo
T#:367933
Part#: 17222245358
In Stock
$ 3.99 USD
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Upgrade your BMW's oil or transmission cooling system with the Turner Motorsport Genuine O-Ring, part number 17222245358. This high-quality O-ring is designed to provide a reliable seal, ensuring optimal performance and preventing leaks in your BMW's vital systems. Additionally, it is compatible with MINI applications, where it is commonly used on the end of the parking brake cable.

  • Genuine BMW part for guaranteed quality and compatibility
  • Prevents leaks in the oil and transmission cooling systems
  • Ensures optimal performance of vital components
  • Compatible with MINI applications for versatile use
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MTC - Corporate Logo
T#:371231
Part#: 17117514402
In Stock
$ 7.99

This product was last offered at the strikethrough price on
06-19-2026

$ 5.09 USD
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$ 5.09 USD
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URO Parts Thermostat Assembly - 11537509227
2X Entries Into Our F80 M3 Sweepstakes
URO - Corporate Logo
T#:29466801
Part#: 11537509227
In Stock
$ 41.99 USD
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$ 41.99 USD
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The thermostat cover in your BMW, made from plastic, is notorious for failing. After years of exposure to hot coolant, the plastic can crack, leading to significant coolant leaks and potential engine overheating.

URO Parts offers a superior solution with their high-quality thermostat cover, designed to surpass the durability of the original factory part. This replacement thermostat comes complete with a gasket for an effortless service.

Features:

Perfect Fit: Guaranteed fitment ensures a seamless replacement process. Optimal Cooling: High-flow OE-style design ensures efficient engine cooling performance. Easy Installation: Manufactured to factory housing dimensions for straightforward bolt-on installation and secure hose connections. Comprehensive Design: Includes ports for temperature sensors where applicable. Superior Materials: Constructed from high-quality alloy or composite materials that resist temperature-induced warping or cracking, preventing coolant leaks. URO Parts, with over 8,000 premium spare parts, specializes in manufacturing precise, durable replacements for factory BMW components. Committed to the highest standards of precision, materials, and workmanship, each part is rigorously tested to deliver the best combination of durability, functionality, and affordability. For reliable replacement parts that offer great value, choose URO Parts.

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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
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Sale - Save 20%
$ 20.99

This product was last offered at the strikethrough price on
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$ 16.79 USD
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The auxiliary fan switch activates the auxiliary cooling fan to provide additional cooling under high heat loads, and when the car is stationary

Mahle-Behr - Corporate Logo
T#:2766
Part#: 17111742231
In Stock
$ 20.99

This product was last offered at the strikethrough price on
09-10-2026

$ 19.99 USD
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$ 19.99 USD
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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.

Hailing from Stuttgart, Mahle-Behr specializes in automotive cooling systems. From air conditioning to engine cooling M-B has you covered with OE-quality replacement parts.

This item fits the following BMWs:
1990-1991 E30 BMW 318i 318is 318ic
1992-1998 E36 BMW 318i 318is 318ic 323is 323ic 325i 325is 325ic 328i 328is M3
1999-2005 E46 BMW 323i 323ci 325i 325ci 325xi 328i 328ci 330i 330ci 330xi M3
1989-1995 E34 BMW 530i 535i 540i M5
1991-1995 E34 BMW 525i
1997-2003 E39 BMW 525i 528i 530i 540i M5
1989-1994 E32 BMW 735i 735il 740i 740il 750il
1995-2001 E38 BMW 740i 740il 750il
2002-2008 E65 BMW 745i 745li 750i 750li 760i 760li
1990-1998 E31 BMW 840i 840ci 850i 850ci 850csi
2004-2011 E83 BMW X3 2.5i X3 3.0i X3 3.0si
2000-2006 E53 BMW X5 30.0i X5 4.4i X5 4.6is X5 4.8is
1996-2002 Z3 BMW Z3 1.9 Z3 2.3 Z3 2.5i Z3 2.8 Z3 3.0i M Coupe M Roadster
2003-2008 E85 BMW Z4 2.5i Z4 3.0i Z4 3.0si M Roadster M Coupe
2000-2003 E52 BMW Z8 Z8 Alpina
2007+ E90 BMW 335i & 335xi
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Redline - Corporate Logo
T#:394769
Part#: REDLINE5A
In Stock
Starting at $ 15.99 USD
Free Shipping on orders $49 and up
Starting at $ 15.99 USD
Free Shipping on orders $49 and up
Water Wetter is a unique wetting agent for cooling systems which reduces coolant temperatures by as much as 30*F. This liquid product can be used to provide rust and corrosion protection in plain water for racing engines, which provides much better heat transfer properties than glycol-based antifreeze.
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Silicone Coolant Pipe Repair Kit
2X Entries Into Our F80 M3 Sweepstakes
URO Premium - Corporate Logo
T#:554118
Part#: 11537516414
In Stock
$ 14.99 USD
Free Shipping on orders $49 and up
Subject to the ravages of heat cycling during each driving cycle - rubber hoses are more susceptible to wear and fatigue than aluminum piping. BMW utilized a single part number for their aluminum pipe and hose combination - making this part typically over $100 to replace. Rein to the rescue! By supplying just the rubber component, repairs can be made quickly and cost effectively (and without the waste of scraping a perfectly good aluminum pipe!) Includes both hose clamps and rubber hose.
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Genuine BMW - Corporate Logo
T#:348234
Part#: 11510392553
In Stock
$ 13.99 USD
Free Shipping on orders $49 and up
As aluminum screws/bolts are one time use only, be sure to replace yours with brand new bolts if/when you need to remove your water pump for any reason. This is a complete set of three.


Radiator Drain Plug
2X Entries Into Our F80 M3 Sweepstakes
URO - Corporate Logo
T#:380524
Part#: 17111437361
In Stock
$ 3.99 USD
Free Shipping on orders $49 and up
Usually stripped out after being removed
40-60mm 3/8"/9mm Band Hose Clamp
10X Entries Into Our F80 M3 Sweepstakes
ECS - Corporate Logo
T#:341280
Part#: 003402ECS06A-08
In Stock
Sale - Save 25% $ 3.99

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

$ 2.99 USD
Free Shipping on orders $49 and up
Sale - Save 25%
$ 3.99

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

$ 2.99 USD
Free Shipping on orders $49 and up

ECS Tuning 304 Stainless Steel Hose Clamps

Revolutionize your car maintenance with ECS Tuning's premium 304 stainless steel hose clamps. Eliminate dealership delays and inflated prices! These German-style clamps utilize T-bolts for hassle-free diameter adjustment. With various band widths available, these durable clamps ensure reliability without the hefty cost. Experience dealership-quality products at affordable rates, exclusively at ECS Tuning.

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Schwaben Radiator/ Intercooler Fin Comb
10X Entries Into Our F80 M3 Sweepstakes
Schwaben - Corporate Logo
T#:384260
Part#: 015326SCH01A
In Stock
Sale - Save 29% $ 20.99

This product was last offered at the strikethrough price on
05-02-2026

$ 14.99 USD
Free Shipping on orders $49 and up
Sale - Save 29%
$ 20.99

This product was last offered at the strikethrough price on
05-02-2026

$ 14.99 USD
Free Shipping on orders $49 and up
Straighten bent fins in heat exchangers like radiators, condensers, and intercoolers obstruct air flow and reduce heat transfer. Paper-thin fins are easily bent, even by slight pressure.

3/8"/9mm Band Hose Clamp - 50-70mm
10X Entries Into Our F80 M3 Sweepstakes
ECS - Corporate Logo
T#:341684
Part#: 003402ECS06A-12
In Stock
Sale - Save 25% $ 6.99

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

$ 5.24 USD
Free Shipping on orders $49 and up
Sale - Save 25%
$ 6.99

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

$ 5.24 USD
Free Shipping on orders $49 and up
Elevate your BMW maintenance with ECS Tuning's 304 stainless steel hose clamps, offering convenience and top-quality performance at an affordable price. Designed with various band widths and German-style T-bolts for adjustable sizing, these hose clamps ensure a secure fit for your specific diameter needs. Skip the dealership wait and excessive pricing; ECS Tuning provides reliable, dealership-quality hose clamps without the premium cost, ensuring your car receives the care it deserves.
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Band Hose Clamp | 12-20mm 3/8"/9mm
10X Entries Into Our F80 M3 Sweepstakes
ECS - Corporate Logo
T#:304266
Part#: 003402ECS06A-03
In Stock
Sale - Save 25% $ 4.99

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

$ 3.74 USD
Free Shipping on orders $49 and up
Sale - Save 25%
$ 4.99

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

$ 3.74 USD
Free Shipping on orders $49 and up
Secure hoses in your BMW effortlessly with the ECS 3/8" / 9mm Band Hose Clamp (12-20mm). Specifically designed for BMW models, this clamp ensures a snug fit and reliable hold for hoses measuring between 12mm to 20mm. Crafted with durable materials, these clamps provide exceptional resistance against leaks and are ideal for various automotive applications. Upgrade your BMW's hose security with these reliable ECS hose clamps.
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Rein - Corporate Logo
T#:340541
Part#: 17111742231
In Stock
$ 17.99 USD
Free Shipping on orders $49 and up
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.
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Bremmen Parts O-Ring
Found at the flange end of the upper thermostat hose
10X Entries Into Our F80 M3 Sweepstakes
Bremmen Parts - Corporate Logo
T#:399143
Part#: 11537545278
In Stock
Sale - Save 20% $ 5.09

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

$ 4.07 USD
Free Shipping on orders $49 and up
Sale - Save 20%
$ 5.09

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

$ 4.07 USD
Free Shipping on orders $49 and up
Seals your cooling system
BMW Brass Coolant Bleeder Screw - Priced Each
2X Entries Into Our F80 M3 Sweepstakes
URO Premium - Corporate Logo
T#:587673
Part#: 17111712788PRM
In Stock
$ 5.35 USD
Free Shipping on orders $49 and up
Having an operational bleeder screw for your coolant system assures that when service is performed, all air pockets are removed. Having air pockets in your coolant system prevents your system from functioning properly. Your heat may not work as well and there is the potential for engine overheating if the air pocket is trapped behind the thermostat. Be sure that all of the air is bled out of your system with a new bleeder screw.
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Meyle Expansion Tank Cap
5X Entries Into Our F80 M3 Sweepstakes
We Price Match - Give Us A Call or Chat!
Meyle - Corporate Logo
T#:579357
Part#: 3148009004
In Stock
Sale - Save 40% $ 14.99

This product was last offered at the strikethrough price on
05-15-2026

$ 8.99 USD
Free Shipping on orders $49 and up
Sale - Save 40%
$ 14.99

This product was last offered at the strikethrough price on
05-15-2026

$ 8.99 USD
Free Shipping on orders $49 and up
Replace worn or missing pieces.

Burgaflex - Corporate Logo
T#:57725187
Part#: 11537541992
In Stock
New Item
$ 26.99 USD
Free Shipping on orders $49 and up
The Burgaflex Coolant Outlet Hose delivers track-ready reliability for high-demand driving conditions.
Aluminum Screws for N52 N54 Water Pump
2X Entries Into Our F80 M3 Sweepstakes
Rein - Corporate Logo
T#:2253
Part#: 11510392553
In Stock
$ 7.99

This product was last offered at the strikethrough price on
10-05-2026

$ 7.13 USD
Free Shipping on orders $49 and up
$ 7.13 USD
Free Shipping on orders $49 and up
These aluminum water pump screws are single use and must be replaced each time they are removed. These are used on all 325i, 328i, and 330i with the BMW N51 N52 and N53 engines. They were also used on some early N54 engines that have rubber mounts on the water pump housing. Do not use these bolts if your N54 water pump has been replaced with a housing that does not have the rubber mounts.

In German, Rein means Pure. In the automotive industry the Rein name has quickly come to represent quality. With fitments for some of the world’s finest automobiles including BMW and Mini and guaranteed OE quality, Rein is a name you can trust.

This item fits the following BMWs:
2008+ E82 BMW 128i 135i
2007+ E9X BMW 325i 325xi 328i 328xi 330i 335i 335xi
2006+ E60 BMW 525i 525xi 528i 528xi 530i 530xi 535i 535xi
2006+ X3 BMW X3 3.0i X3 3.0si
2006+ Z4 BMW Z4 3.0i Z4 3.0si
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Mishimoto - Corporate Logo
T#:363171
Part#: MMFANMOUNT
In Stock
$ 15.99 USD
Free Shipping on orders $49 and up
The Mishimoto universal fan mount kit is used to mount a Mishimoto electric fan to any Mishimoto aluminum radiator. Great for custom applications, the Mishimoto fan can be mounted in any convenient position on the radiator. Universal fan mount fits any Mishimoto electric fan Ideal for custom applications Mounts fan in any convenient position Mishimoto Lifetime Warranty
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Rein - Corporate Logo
T#:348982
Part#: 11537521049
In Stock
$ 17.99 USD
Free Shipping on orders $49 and up
Connects from the water pump to the thermostat
Auxiliary Fan Switch O-Ring
2X Entries Into Our F80 M3 Sweepstakes
URO - Corporate Logo
T#:377077
Part#: 13621433077S
In Stock
$ 0.88 USD
Free Shipping on orders $49 and up
Now you can just replace the o-ring instead of the whole switch