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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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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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$ 497.99 USD

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Adapters for most European and domestic vehicles

Water Pump O-Ring

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T#:555320

Part#: 11537830709

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$ 2.99 USD

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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

Ships in 3 Business Days

$ 1,108.99 USD

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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.

Febi Freeze Plug - 11111714712

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T#:6570

Part#: 11111714712

In Stock at Vendor

$ 3.99

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

$ 1.81 USD

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$ 1.81 USD

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ENGINE COVER LID 11111714712

Universal 10" Electric Fan - Black

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T#:378434

Part#: MMFAN10

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$ 88.99 USD

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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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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.

Expansion Tank Mounting Clamp

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T#:591954

Part#: 17111707777

Ships in 1 Business Day

$ 6.99 USD

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

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

Ships in 3 Business Days

$ 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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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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$ 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

Ships in 2 Business Days

$ 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.

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