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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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Genuine BMW Coolant hose - E46 M3

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T#:150726

Part#: 64216902679

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3% off MSRP $ 35.99

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

$ 34.99 USD

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3% off MSRP

$ 35.99

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

$ 34.99 USD

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Genuine BMW Hose F Water Valve And Radiator
This item fits the following BMW Chassis:
E46 M3,E46

Universal 12" Electric puller Fan - Black

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T#:598801

Part#: 30100375

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$ 99.99 USD

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$ 99.99 USD

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861 CFM. High performance puller fan with straight 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 2.2in Airflow (CFM): 861

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Bav Auto Angled Hose Pinch Plier Set - 2pc

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T#:580379

Part#: B8800058

In Stock

Sale - Save 25% $ 32.99

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

$ 24.74 USD

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Sale - Save 25%

$ 32.99

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

$ 24.74 USD

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Angled jaws close, creating a complete seal every time you use them - the jaws are offset, making it possible to use in hard-to-reach locations. Made of glass-filled nylon for extra strength. These are perfect for use with brake lines, etc.

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DO88 Racing Auxiliary Oil Cooler - E46 M3

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T#:13891851

Part#: OC120E46

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$ 646.99 USD

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$ 646.99 USD

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This racing oil cooler shines in low-pressure situations, for example, power steering oil cooling or gearbox oil cooling. This oil cooler comes ready to install with hardware.

BMW Mishimoto 12" Universal Curved Blade Electrical Fan

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T#:637388

Part#: MMFAN-12C

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$ 96.99 USD

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$ 96.99 USD

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BMW Mishimoto 12" Universal Curved Blade Electrical Fan

The BMW Mishimoto 12" Universal Curved Blade Electrical Fan is an ideal upgrade for enhancing cooling efficiency or addressing fitment issues with aftermarket components. Turner Motorsport offers this fan with a slim profile that allows for easy installation flush against the radiator, ensuring optimal performance and space utilization.

Benefits:

High-Flow Performance: Delivers 1150 CFM of airflow for superior cooling efficiency.
Universal Fitment: Designed to fit a wide range of vehicles and applications.
Compact Design: With a diameter of 12" and an overall thickness of just 2.5", it increases engine bay space and allows for flexible installation.
Versatile Operation: Easily reversible for use as either a pusher or puller fan.
Mishimoto Lifetime Warranty: Backed by Mishimoto's lifetime warranty for peace of mind.
Prop 65 Warning: Note that Proposition 65 may apply to this product. For more information, visit www.P65Warnings.ca.gov.

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Mishimoto Replacement Universal Oil Cooler - 19 Row

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T#:381042

Part#: MMOC-19

In Stock

$ 218.99

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

$ 196.99 USD

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$ 196.99 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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Universal 14" Electric Fan - Black

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T#:378422

Part#: MMFAN14

In Stock

$ 100.99 USD

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$ 100.99 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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Universal 12" Electric Fan - Black

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T#:378443

Part#: MMFAN12

In Stock at Vendor

$ 93.99 USD

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$ 93.99 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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Mishimoto Electric Fan and Shroud Kit - No Controller or Sensors - E4...

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T#:378891

Part#: MMFSE4601

Ships in 4 Business Days

$ 373.99 USD

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$ 373.99 USD

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This electric fan for the E46 M3 takes the place of the stock engine-mounted fan and offers several advantages - more horsepower by removing parasitic drag customizable temp control (with optional fan controller - not included in this kit) frame included for a direct fit more reliable than a stock-style fan clutch The stock engine fan is mounted on the water pump shaft and spins with the engine. Torque from the engine is used to spin the fan, which could otherwise be used to power the car. It's not a lot of lost power and torque - Mishimoto measured a max gain of 5whp - but sometimes every little bit helps. And the other advantages of an electric fan make it a smart move. The Mishimoto electric fan uses a 16" slim profile electric fan that flows at 1,850 cubic feet per minute (CFM). The shroud and frame are black powedercoated steel and mounts to existing points on the radiator for a seamless install. Mishimoto has confirmed fitment with stock radiators as well as their own Performance and X-Line aluminum radiators. Hardware and instructions are included. An electric fan must be powered by a 12v source. A fan controller kit is optional and is activated by coolant temp. This is the preferred setup method but other types of controls may also be used. Looking for a kit that includes the fan controller and temp sensors? See T#637722

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AAF E46 Transmission Crossmembers - 6-Speed M

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For M Models

T#:7624640

Part#: 116223

Ships in 4 Business Days

$ 190.00 USD

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$ 190.00 USD

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Since 2010, Advanced Auto Fabrication has been producing and developing both parts and full fledged race cars. Their knowledge base covers a wide range of vehicles both domestic and imported. In the specific case of BMW, the team at AAF has a particular affinity for building and designing components for BMW race cars. Ideal for the SE46 racing series, the AAF E46 6-speed Transmission Crossmember is a heavy-duty and worthwhile upgrade. The OEM thin cast aluminum cross member has been known to fail in multiple different ways. When using stiff engine and transmission mounts, the cross member can crack out and break around these mounting points. The cross member can also break from the high amounts of load transferred through the drive train. While chassis flex from hard cornering is being applied through the engine and transmission from the front cross member, this load is sent from the transmission back into the chassis at the transmission cross member. This is simply too much stress for the OEM cross member to hold up to under the extreme punishment of road racing. The AAF E46 Transmission Cross Member is completely constructed of 1/4' thick heavy-duty aluminum plate. It is designed specifically to cope with hours of endurance racing.

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419 Pc. Metric Universal O-Ring Assortment

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T#:3657943

Part#: ATD3601

Ships in 2 Business Days

$ 59.99 USD

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Always have extra o-rings

Spal Electric Fan Harness with Relay

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T#:2181323

Part#: FRH

Special Order: No Guaranteed ETA

12% off MSRP $ 112.99

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

$ 99.99 USD

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12% off MSRP

$ 112.99

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

$ 99.99 USD

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SPAL® electric fan relay wiring kits are designed to automatically turn on your SPAL® electric fan when the air conditioning is turned on. They can also be used when dual electric fans are installed using one switching device. Features: Makes installation of your new fan a breeze Designed to safely integrate with OEM wiring Feature a waterproof 10/40 amp relay with printed wires for easy installation Harness is designed for 12V systems only Does not included thermo-switch

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