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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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Mishimoto Silicone Radiator Hose Kit - Red - E46 M3

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T#:378416

Part#: MMHOSEE4699RD

In Stock at Vendor

$ 121.99 USD

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$ 121.99 USD

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Mishimoto BMW E46 silicone radiator hose kits are made with a dual-layer combining high-grade silicone and heat-resistant embedded fibers to provide efficient heat reduction and increased pressure tolerance, all with an OEM replacement fit. Perfect for your BMW. Direct fit for 2001–2006 BMW E46 M3 Max temperature of 330°F Made of high-grade silicone and heat-resistant embedded fibers Efficiently reduces heat Increases pressure tolerance OEM replacement fit Available in black, blue, or red Mishimoto Lifetime Warranty 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 - Blue

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T#:378412

Part#: MMFAN12BL

Ships in 2 Business Days

$ 106.99 USD

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$ 106.99 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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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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Genuine BMW Radiator Fan Clutch

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T#:367654

Part#: 11527831619

Ships in 2 Business Days

3% off MSRP $ 401.99

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

$ 388.99 USD

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3% off MSRP

$ 401.99

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

$ 388.99 USD

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Ensure optimal engine cooling for your BMW with this Fan Clutch, designed to adapt the fan speed based on the engine's rotational speed. Perfect for city driving and traffic, this fan clutch minimizes rotational load and drag when cooling is not critical.

Compatible with various BMW models
Adjusts fan speed based on engine rotational speed
Ideal for city driving and traffic conditions
Reduces rotational load and drag when cooling is not critical
Enhances engine cooling efficiency
Suitable for vehicles with mechanical fans
Easy solution for vehicles running hot in traffic

Upgrade your BMW's cooling system with this Fan Clutch, ensuring a cool and efficient engine performance, especially during city driving and traffic stops.

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Genuine BMW Water Pipe - Thermostat Housing to Return Pipe - E46 Z3 Z...

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T#:36149

Part#: 11537830710

Ships in 5 Business Days

4% off MSRP $ 76.99

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

$ 73.99 USD

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4% off MSRP

$ 76.99

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

$ 73.99 USD

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Genuine BMW Pipe
This item fits the following BMW Chassis:
E46 M3,E85 Z4M,E46,E85 Z4,E86 Z4

Fits BMW Engines including:
S54

BMW S54 ECS Exact-fit Waterpipe Connecting Line

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T#:393388

Part#: 013178ECSKT

In Stock

Sale - Save 25% $ 148.99

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

$ 111.74 USD

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Qty

Sale - Save 25%

$ 148.99

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

$ 111.74 USD

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BMW S54 ECS Exact-fit Waterpipe Connecting Line

Enhance your vehicle’s performance with the BMW S54 ECS Exact-fit Waterpipe Connecting Line, crafted for precision and durability.

Precision Engineering: Engineered to exact specifications for a perfect fit.
Enhanced Cooling: Improves coolant flow for better engine temperature regulation.
Durable Construction: Made from high-quality materials to withstand engine heat and pressure.
Direct Replacement: Installs seamlessly without modifications for hassle-free maintenance.

Upgrade your BMW S54 engine with confidence using the ECS Exact-fit Waterpipe Connecting Line, delivering reliability and performance you can depend on.

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Motorsport Thermostat - 55 (NO LONGER AVAILABLE)

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T#:337991

Part#: 11531417215

Back Ordered

Starting at $ 232.98 USD

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Starting at $ 232.98 USD

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E46M3 Motorsport Thermostat 55C (Also fits Euro E36 M3 engine) A Genuine BMW part this thermostat opens at a much lower temperature than stock to keep your S54 engine (or Euro S50/S52 engine) running cooler in race applications.

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BMW E46 M3 Oil Line -10 AN Adapter Fitting Kit

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2X Entries For Our G87 M2 Sweepstakes!

T#:31158758

Part#: 8241

In Stock

$ 89.00 USD

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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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Universal 12" Electric Puller Fan - Black

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T#:598797

Part#: 30102029

In Stock

$ 207.99 USD

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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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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

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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$ 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

In Stock at Vendor

$ 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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