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BMW Cooling System Parts & Accessories for BMW E46 M3 S54 (1999-2005)

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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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Red Line Water Wetter Coolant Additive

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T#:394769

Part#: REDLINE5A

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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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90-110mm 3/8"/9mm Band Hose Clamp

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T#:341281

Part#: 003402ECS06A-13

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ECS Tuning 304 Stainless Steel Hose Clamps

Once again, ECS Tuning has found a way to make life easier for working on your car. Need new hose clamps but don't want to wait to order it from the dealership or pay more than you should for a hose clamp? That's where we come in! These are full 304 stainless steel hose clamps with various band widths for your convenience. They are German style using T-bolts to adjust in size to your required diameter. Never pay dealer pricing again, but still get the quality you love here at ECS Tuning.

Made from high-quality 304 stainless steel for durability
German-style design with T-bolts allows for easy size adjustment
Various band widths for versatile use
Avoid dealership pricing without compromising on quality
Perfect for BMW enthusiasts seeking affordable yet reliable hose clamps

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BMW Brass Coolant Bleeder Screw - Priced Each

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T#:587673

Part#: 17111712788PRM

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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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Wahler Thermostat O-Ring - E46, Z3, Z4

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T#:362366

Part#: 11531318402

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$ 6.17 USD

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BMW does not include a o-ring with their new thermostats

SPAL Fan Mounting Bracket - E30 E36 E46

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T#:584502

Part#: 30130011

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$ 12.99 USD

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$ 78.99

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

$ 12.99 USD

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Securely mount your fan in place to reduce movement and increase rigidity.

Bremmen Auxiliary Fan Temperature Switch - E46 E39 E9X E60 E70 E53 ...

Mounted in upper radiator hose, controls operation of auxiliary fan

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T#:640141

Part#: 13621433077

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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

OEM Behr Coolant Expansion Tank Cap - E36 E46 E34 E39 E32 E38 E65 X3 ...

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T#:2766

Part#: 17111742231

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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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BMW E46 M3 Oil Line -10 AN Adapter Fitting Kit

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T#:31158758

Part#: 8241

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$ 89.00 USD

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BMW Oil Line -10 AN Adapter Fitting Kit is designed for optimal performance with both oil cooler and thermostat housing setups. This comprehensive kit from Turner Motorsport provides everything needed for a secure and reliable connection.

Each fitting kit includes:

Qty. 2 - Aluminum -10 AN to ORB Fittings
Qty. 2 - O-Rings
Qty. 1 - Aluminum Fitting Bracket
Qty. 1 - M8 Mounting Bolt

Note: If using a -10 AN connection on the thermostat housing side, a second fitting kit is required.

Benefits:

Enhances connection reliability for oil cooler and thermostat housing
High-quality aluminum fittings ensure durability and performance
Includes all necessary components for easy installation
Compatible with CSF #8240 (BMW S54 Swap Race Spec Oil Cooler) and CSF #8032 (BMW E46 M3/S54 Race-Spec Oil Cooler)

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3/8"/9mm Band Hose Clamp - 50-70mm

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T#:341684

Part#: 003402ECS06A-12

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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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Radiator Support Bracket

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T#:371231

Part#: 17117514402

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Febi Temperature Sensor

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T#:340711

Part#: 13621433076

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$ 17.99

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Monitors coolant / oil temperature

Genuine BMW Coolant Bleeder Screw 17111712788

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T#:7432

Part#: 17111712788

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$ 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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77-85mm - 3/4" Band Hose Clamp

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T#:377877

Part#: 003402ECS07A-05

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Upgrade your BMW's hose clamps with the 77-85mm - 3/4" Band Hose Clamp from Turner Motorsport. These full 304 stainless steel clamps offer convenience and quality without the dealership price tag. German-style T-bolts allow for easy adjustment to your required diameter, ensuring a secure fit every time.

Made of durable 304 stainless steel for long-lasting performance
German-style T-bolt design for easy size adjustment
Convenient band widths for versatile applications
Quality alternative to dealership pricing

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Universal 12" Electric Puller Fan - Black

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T#:598797

Part#: 30102029

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$ 207.99 USD

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1328 CFM. High performance puller fan with curved blades. This is a universal fan for applications that require more air flow or for engine compartments that have tight tolerances such as an aftermarket turbo set up that needs more clearance. This fan is universal and you must make it fit your application. It is not a direct bolt on. Made in Italy. Size: 13.25in x 12.5in x 3.5n Airflow (CFM): 1328

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Mishimoto Universal Fan Mount Kit

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T#:363171

Part#: MMFANMOUNT

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$ 15.99 USD

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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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Bremmen Coolant Bleeder Screw - BMW E30 E36 E38 E39 E46 E83 E90 Z4 ...

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T#:640140

Part#: 17111712788

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$ 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.

Schwaben Radiator/ Intercooler Fin Comb

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T#:384260

Part#: 015326SCH01A

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$ 14.99 USD

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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.

BMW Antifreeze Coolant - 1 Liter Bottle

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T#:11526

Part#: 82142209769

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$ 10.51 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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Water Pump Installation Hardware Kit

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T#:55209926

Part#: 0071199KT

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$ 7.94 USD

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This Genuine BMW water pump installation hardware kit is the exact factory refresh package needed to maintain the structural integrity of your cooling system's plumbing.

Radiator Pressure Test kit 14 pc

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T#:3629267

Part#: ATD3300

Ships in 6 Business Days

$ 497.99 USD

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Adapters for most European and domestic vehicles

Expansion Tank Mounting Clamp

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T#:591954

Part#: 17111707777

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Locks the expansion tank into the mounting plate via the large hole in the bottom of the tank

16" Fan shroud gasket

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T#:598825

Part#: 30130074

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$ 17.99 USD

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Provides .25" stand off from radiator, does not work with high output fans.

Water Pump O-Ring

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T#:555320

Part#: 11537830709

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$ 2.99 USD

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When it comes time to replace the water pump, be sure to replace all the O-Rings associated with it to ensure that your car stays leak free. If you are experiencing leaking issues, be sure to inspect these rings, as they might have worn down. This is used on the return pipe to the thermostat housing

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Mishimoto Essentials Bundle - BMW E46 M Cars

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T#:51039998

Part#: MMB-E46-001

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$ 1,108.99 USD

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This bundle optimizes the E46’s thermal efficiency by converting the heavy, parasitic mechanical clutch fan to a high-flow electric unit.

CSF Universal Large Single-Pass Oil Cooler - Universal Application ...

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Universal fitment design - modifications may be necessary to run this cooler

T#:53608839

Part#: 8371

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$ 499.00 USD

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CSF redesigned this cooler and went with a more traditional inlet/outlet orientation. The new single pass design features high efficiency and high durability, but with vertically oriented inlet and outlet connections.

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Universal 10" Electric Fan - Black

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T#:378434

Part#: MMFAN10

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$ 88.99 USD

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WARNING! Prop 65 may apply to this product. Proposition 65 (Safe Drinking Water and Toxic Enforcement Act of 1968) is a California law that applies to call companies selling products in California. Prop 65 requires any listed chemical present above very low levels that are known to cause cancer, birth defects, or other reproductive harm. For more information about California Prop 65 warning see: www.P65Warnings.ca.gov.

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Febi Freeze Plug - 11111714712

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T#:6570

Part#: 11111714712

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$ 3.99

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$ 1.81 USD

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ENGINE COVER LID 11111714712

Fan mounting pin - priced each

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T#:598910

Part#: 30130013

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$ 6.99 USD

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Wire pin used to mount electric fan directly to radiator.

Hose Clamp 2 5/16" - 3 1/4" - priced each

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T#:376806

Part#: 54155K23

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$ 4.99 USD

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Hose Clamp 2 5/16" - 3 1/4"

Ensure secure hose connections with the Hose Clamp 2 5/16" - 3 1/4", a versatile and reliable solution for various applications. Crafted from durable materials, this clamp offers superior strength and corrosion resistance. Its adjustable design allows for a snug fit, reducing the risk of leaks and ensuring optimal performance. Upgrade your hose connections with the precision and reliability of the Hose Clamp 2 5/16" - 3 1/4".

Versatile and reliable solution for various applications
Superior strength and corrosion resistance
Adjustable design for a snug fit
Reduces risk of leaks for optimal performance

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Oil Cooler Line O-Ring & Screw Kit

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T#:55281750

Part#: 1722OCLKT

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$ 20.60 USD

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This Genuine BMW Oil Cooler Line O-Ring & Screw Kit includes the exact factory components required to safely service your oil cooler hard lines.

O-RING

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T#:580584

Part#: C32348

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$ 2.99 USD

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Bracket - Fan Housing - E46

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T#:45829

Part#: 17112282209

Ships in 8 Business Days

$ 13.99 USD

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Genuine BMW Bracket, Fan Housing
This item fits the following BMW Chassis:
E46 M3,E46

Fits BMW Engines including:
S54

Anti-Freeze Tester

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T#:641679

Part#: CTAA195

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$ 9.98 USD

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Tests all ethylene glycol solutions with radiator hot or cold

DO88 Aluminum Radiator - Blue Hose - E46 M3

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T#:13891811

Part#: WC310B

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$ 735.99 USD

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The team at DO88 has vigorously tested this radiator to deliver peak performance with the peace of mind of quality for your E46 M3. They guarantee reliability and endurance in all situations to let your car breathe better than before! Boasting a 17% increase in core volume, this upgrade is a no-brainer for petrol heads like us. Keeping core temperatures low eliminates the risk of heat soak leading to overheating giving you max performance at any given moment. no compromise has been made at DO88 leaving you with one of the best radiator options on the market!

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BMW Radiator Expansion Tank Pressure Fitting

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Requires the use of a Motive Power Bleeder, sold separately

T#:380462

Part#: 1175

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$ 24.99 USD

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Allows you to check for leaks in the coolant system

Elring Thermostat O-Ring - BMW S54 3.2L

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T#:45278657

Part#: 293.300

Special Order: No Guaranteed ETA

$ 3.99 USD

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Seals the thermostat and thermostat housing to the water pump Replaces BMW # 11531318402

Bremmen Engine Fan Blade - 11 Blades, 420mm - BMW M30 S38 M50 M52 S5...

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T#:640149

Part#: 11521712058

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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.

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2 Pin Connector

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T#:33412932

Part#: 61132359999

Ships on Jul 28, 2026

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$ 8.24 USD

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Includes connector housing with terminals and seals. Commonly used for the coolant level sensor.

ECS Tuning replacement harness connectors include all necessary pins and wire seals for a complete harness repair. Whether you have a broken harness connector or need a complete wiring repair, we have the components you need.

Each connector includes an additional terminal in case one becomes lost or damaged during installation.

*OEM cross reference PN# 61132359999 - Commonly used for the coolant level sensor.

Please reference the original part number from the existing connector to confirm fitment, before ordering.

Suggested tools:

Suggested crimping pliers: T#387193
Wire De-pin tools:
12pc De-Pin Tool Set - T#386379
23pc De-Pin Tool Set - T#641943

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Bav Auto Temperature Sensor - BMW E39 E46 E9X E60 F01/02

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T#:639833

Part#: 13621433076

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$ 11.99 USD

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This is the coolant temperature sensor used in many BMW models from the late-1990s to the mid-2010s. The engine computer relies on the coolant temp to set the fuel mapping for the engine. As the car warms up the computer changes the fuel mixture. If your car is running a bit rich (too much fuel) it could be because this sensor is failing and not sending the correct info to the computer. This sensor is located in a variety of places depending on the engine. But it's one of those easy replacement items 'while you're in there' when doing a water pump or thermostat replacement. 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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Auxillary Fan Switch

Mounted in upper radiator hose, controls operation of auxiliary fan

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T#:4934936

Part#: 3148210000

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$ 18.99 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. Also known as the coolant temperature sending unit, comes with related o-ring

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Fluid Level Sensor

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T#:5973204

Part#: 17117546548

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$ 13.99 USD

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$ 13.99 USD

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MEYLE-ORIGINAL: True to OE fluid level sensor. Used in multiple locations. Wulf Gaertner Autoparts AG manufactures and markets automotive spare parts under its MEYLE brand. Since its foundation in 1958, Wulf Gaertner Autoparts has been an owner-operated, unlisted family business on the aftermarket scene. Since 1995, Wulf Gaertner Autoparts AG has been manufacturing and trading under its MEYLE brand. They pride themselves on top-grade quality-tested spare parts for passenger cars, vans and commercial vehicles. Comparable OE Cross Reference - 17117546548

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Coolant Flange - Rear/Engine Block

Fits European models only

affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms

T#:55533481

Part#: 11531708808

Special Order: No Guaranteed ETA

$ 9.99 USD

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$ 9.99 USD

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This Meyle Original-grade replacement coolant flange is the perfect solution for refreshing your BMW’s cooling plumbing back to factory-fresh operation.

Auxiliary Fan Switch

Mounted in upper radiator hose, controls operation of auxiliary fan

affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms
2X Entries For Our G87 M2 Sweepstakes! We Price Match - Give Us A Call or Chat!

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

Meistersatz Temperature Sensor

affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms

T#:379740

Part#: 13621433076

Ships in 3 Business Days

$ 15.99 USD

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$ 15.99 USD

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Monitors coolant / oil temperature

URO Radiator Mounting Bracket - E46 Z4

Right Lower

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2X Entries For Our G87 M2 Sweepstakes! We Price Match - Give Us A Call or Chat!

T#:593030

Part#: 17111436264

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$ 9.99 USD

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$ 9.99 USD

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URO Parts is one of the leading manufacturers of high quality direct replacement aftermarket components, covering a wide range of makes and models. All of their replacement parts are manufactured to ISO 9000 certification standards, so you can expect long lasting performance from URO Parts.

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DO88 Coolant Hoses - Blue - E46 M3

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T#:13924830

Part#: DO88KIT70B

Back Ordered

$ 256.99 USD

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$ 256.99 USD

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Made out of high-quality silicone, these hoses display the highest levels of durability and quality. With three to five layers of armory the hoses are designed to withstand high pressure and heat for an extended period of time. The OE hoses are known to crack and leak but this hose kit eliminates any chance of that.

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BMW Radiator Hose Kit - 11537830715

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T#:46719180

Part#: CHK0376R

Back Ordered

$ 43.99 USD

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$ 43.99 USD

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Keep your cooling system sealed, strong, and ready for anything with this Rein radiator hose kit—your all-in-one fix for cracked, leaking, or worn factory hoses. Years of heat, pressure, and age can cause rubber to weaken, split, or swell, setting the stage for coolant leaks and potential overheating. Rein hoses are engineered to meet or exceed OEM standards, built from premium, heat-resistant materials that can take on extreme temperatures and system pressures without faltering. Each hose features factory-correct bends, fittings, and diameters for an exact, hassle-free installation—no cutting or forcing required. Whether you’re tackling a full cooling system refresh or chasing down a small coolant leak, this Rein kit provides everything needed to restore confidence and performance under the hood. Why choose this Rein radiator hose kit: Factory-level precision – Direct-fit replacements that deliver OEM-quality reliability. Built to last – Resists cracking, swelling, and chemical damage from daily heat cycling. Confidence restored – Prevents coolant loss, overheating, and on-road breakdowns. All-in-one upgrade – Includes upper and lower hoses for a complete system refresh. If keeping your BMW’s cooling system running tight and trouble-free is the goal, Rein brings the dependable quality and fitment you can count on—engineered to perform just like factory, mile after mile.

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Radiator Support Bracket

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2X Entries For Our G87 M2 Sweepstakes! We Price Match - Give Us A Call or Chat!

T#:14122755

Part#: 17117514402

Special Order: No Guaranteed ETA

$ 8.99 USD

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$ 8.99 USD

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Mounts to top of radiator bracket, 2 per vehicle.

Lower Radiator Mount - Priced Each

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T#:361005

Part#: 17111178412

Back Ordered

$ 2.03 USD

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$ 2.03 USD

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This is the small lower rubber mount that goes on the bottom of the radiator. These mounts sit down into mount 17111723337. Fits left or right side - priced each

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