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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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Aluminum Radiator - Black - E46 M3

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T#:13891809

Part#: WC310S

Ships on Jul 31, 2026

$ 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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Mishimoto Performance Aluminum Radiator - E46 M3

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T#:378511

Part#: MMRADE4601

Ships in 4 Business Days

$ 721.99 USD

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Mishimoto radiators address all of the defects of the stock E46 radiator in a well-engineered and price-competitive direct replacement unit. The Mishimoto radiator is an all aluminum design that replaces the factory plastic and aluminum stock radiator. The stock plastic end tanks are notorious for cracking and leaks whereas the Mishimoto has aluminum end tanks that will never fail. Mishimoto can also build 30% more coolant capacity into the a radiator that fits in the original location with no modifications. More coolant volume means the fluid is not heat soaked for as long (less super heated fluid circulating through the engine). For a direct replacement performance radiator, the Mishimoto is hard to beat!

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Universal 16" High performance Electric puller Fan - Black

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T#:598818

Part#: 30102113

In Stock at Vendor

$ 257.99 USD

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$ 257.99 USD

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2467 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: 16.25in x 15.75in x 3.5in Airflow (CFM): 2467

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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 3 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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Gear Wrench Angled Hose Clip Pliers

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T#:387079

Part#: KDT3977

Ships in 2 Business Days

$ 53.99 USD

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$ 53.99 USD

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This tool is a variation of our popular 3976 Flat Band Hose Clamp Pliers and features 45º jaws with swivel tips to grip at any angle and pliers that latch securely in position.

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

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T#:36149

Part#: 11537830710

Ships in 6 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

Genuine BMW Fan Shroud - E46 M3

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T#:45806

Part#: 17112228943

Ships in 3 Business Days

3% off MSRP $ 156.99

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

$ 152.99 USD

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3% off MSRP

$ 156.99

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

$ 152.99 USD

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

Fits BMW Engines including:
S54

Genuine BMW Radiator - E46 M3

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T#:13727086

Part#: 17115A7DEF2

Ships in 3 Business Days

6% off MSRP $ 756.99

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

$ 713.99 USD

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6% off MSRP

$ 756.99

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

$ 713.99 USD

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More than likely, you are going to replace the radiator in your vehicle at least once. The joints where the cores meet the end tanks tend to get weak and are the first place to spring a leak. Impacts to the fins themselves can cause holes to form. Corrosion and clogging from the inside can make cooling less than effective and compromise coolant flow. Replace your leaking unit with a factory replacement and get that jug of coolant out of your back seat. This is a factory original style radiator from Genuine BMW and will fit perfectly into the stock location. Cooling will be identical to what your car came with originally. A great replacement with all the proper connections and in all of the proper locations. When doing radiator and cooling service, you will obviously lose coolant. Browse through the cooling section of your model to see factory correct coolants, seals, and caps. Before beginning, check your hoses to make sure everything is in good shape.

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Genuine BMW Radiator Return Line - 32412282353 - E46,E46 M3

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T#:12524

Part#: 32412282353

Ships in 3 Business Days

2% off MSRP $ 280.99

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

$ 274.99 USD

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2% off MSRP

$ 280.99

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

$ 274.99 USD

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Genuine BMW Radiator Return Line
This item fits the following BMW Chassis:
E46 M3,E46

Genuine BMW Temperature Switch for Control Unit Housing (E-Box) (35 d...

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T#:14858

Part#: 12521741900

Ships in 3 Business Days

6% off MSRP $ 82.99

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

$ 77.99 USD

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6% off MSRP

$ 82.99

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

$ 77.99 USD

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Genuine BMW Temperature Switch - 35 Cel
This item fits the following BMW Chassis:
E39 M5,E46 M3,E38,E39,E46,E53 X5 X5,E85 Z4

Fits BMW Engines including:
M52,M54,M56,M60,M62,M73,M73N,S54,S62

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Genuine BMW Radiator Fan Clutch

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T#:367654

Part#: 11527831619

Ships in 3 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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