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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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Spal Thermo-Switch - 185 Degree

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T#:25507142

Part#: SPL185TS

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$ 44.99 USD

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This part replaces faulty thermo-switches found in Spal electric fan conversion kits.

Genuine BMW Radiator Bracket - Lower - E46

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T#:21734

Part#: 17111436264

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4% off MSRP $ 24.99

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$ 23.99 USD

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4% off MSRP

$ 24.99

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

$ 23.99 USD

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Genuine BMW Bracket F.Radiator
This item fits the following BMW Chassis:
E46 M3,E46,E85 Z4

Fits BMW Engines including:
M52,M54,M56,S54

Thermostat With O-Rings - E46 M3, MZ3, Z4 M

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T#:2303

Part#: 11531318274-K

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$ 148.76 USD

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Replacement stock thermostat for E46 M3, Z3M w S54 engine, Z4M.The thermostat can be replaced on the E46 M3 without removing the water pump. This can save you money if the pump still has life left on it but the thermostat needs to be done now. Symptoms of a bad thermostat include an erratic temp gauge and a fault code. When replacing the thermostat, there are three o-rings that will likely need to be replaced between the thermostat and the water pump housing, and two on the coolant tube going to the head. We also recommend new hoses, clamps, and BMW coolant. Replacement should take about one hour.

Note: even though this can be done without replacing the water pump, the job involves removing the same items to access this area. And opening the thermostat housing will spill a lot of coolant. In other words, if you don't replace the water pump at the same time, you're going to repeat this process when the pump needs replacing. We offer a complete water pump overhaul package that covers everything you need if you want to it all at once. You can the thermostat to that package and get everything without any duplicate parts. Click here for the E46 M3 water pump kit.

On S54 engines (E46 M3, MZ3, Z4 M) there is a flanged head bolt going into the cylinder head, behind the thermostat cover. This holds the left side timing chain guide rail in place and if it's loose or falls out you could have a very serious engine failure to deal with. Make sure to check this bolt while you have the thermostat cover off. You only need to make sure it's tight. But if it's come loose you may want to replace the seal ring and use a small touch of oil-resistant thread sealer.

This item fits the following BMWs:
2000-2001 E46 3 Series M3 M3 Convertible 2000-2006
2001-2002 Z3 Roadster / Coupe Z3 M Roadster Z3 M Coupe w S54 Engine
2006-2008 E86 E86 Z4 Z4 M Roadster Z4 M Coupe

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OEM Febi Auxiliary Fan Switch

Mounted in upper radiator hose, controls operation of auxiliary fan

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T#:340712

Part#: 13621433077

Ships on Oct 7, 2026

$ 29.99 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.

Genuine BMW Fan Blade

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T#:360662

Part#: 11521712058

Ships on Jan 4, 2027

6% off MSRP $ 104.99

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

$ 98.99 USD

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6% off MSRP

$ 104.99

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

$ 98.99 USD

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Schwaben Locking Hose Pinch-Off Pliers

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T#:379950

Part#: 009787SCH01A

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Sale - Save 15% $ 39.99

This product was last offered at the strikethrough price on
05-02-2026

$ 33.99 USD

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$ 39.99

This product was last offered at the strikethrough price on
05-02-2026

$ 33.99 USD

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Schwaben Locking Hose Pinch-Off Pliers have adequate clamping force to effectively seal large or pressurized cooling system hoses. These pliers are ideal for clamping shut most hoses, ensuring reliability in your automotive tasks. With swivel jaws, they provide even clamping force, making them a versatile tool for various applications.

Adequate clamping force for large or pressurized hoses
Ideal for clamping shut most hoses
Swivel jaws ensure even clamping force
Versatile tool for automotive maintenance

WARNING: This product contains chemicals known to the state of California to cause cancer, birth defects, and/or reproductive harm. For more information, visit http://www.p65warnings.ca.gov.

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Genuine BMW Coolant Pipe - E46 M3

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T#:13013

Part#: 11537830711

In Stock

Sale - Save 5% $ 154.99

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

$ 147.10 USD

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$ 154.99

This product was last offered at the strikethrough price on
06-25-2026

$ 147.10 USD

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

Fits BMW Engines including:
S54

AFe POWER BladeRunner OER Series Radiator

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T#:35121163

Part#: 46-53241

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$ 258.99

This product was last offered at the strikethrough price on
03-10-2026

$ 236.00 USD

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$ 236.00 USD

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The aFe POWER BladeRunner OER Series Radiators are engineered as the perfect replacement for worn or damaged stock radiators. Over time, stock radiators lose efficiency due to corrosion and road debris, with aging connectors and joints becoming prone to leaks that can lead to overheating and costly engine damage. Our OER radiators feature an all-aluminum core with molded plastic end tanks, incorporating all necessary mounting points and fittings for quick, easy installation. Keep your engine cool and performing at its best with aFe POWER BladeRunner OER Series Radiators.

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Schwaben & Bav Auto Water Pump And Fan Clutch Tool Kit

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T#:375872

Part#: 001170SCH01AKT

In Stock

Sale - Save 25% $ 65.99

This product was last offered at the strikethrough price on
05-02-2026

$ 49.49 USD

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$ 65.99

This product was last offered at the strikethrough price on
05-02-2026

$ 49.49 USD

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Replacing the fan clutch on most BMW models requires holding the water pump pulley while removing the fan clutch lock nut. With less than 1 1/2" clearance on some models this project can easily turn into a mechanical nightmare. Using our special slim line fan clutch wrench in conjunction with the appropriate pulley spanner, the removal and installation required only a few moments.

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MINI Universal 16" Electric Fan - Black

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T#:376582

Part#: 30102049

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$ 207.99 USD

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$ 207.99 USD

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For BMW owners seeking enhanced airflow or tighter engine compartment clearance, Turner Motorsport presents a Universal Fan. Ideal for applications like aftermarket turbo setups, this fan ensures optimal cooling performance. Please note that this fan is universal and may require modification to fit your specific application. Crafted in Italy, this fan boasts dimensions of 16.30in x 15.75in x 3.47in and provides an airflow of 2024 CFM.

Enhanced airflow for improved engine cooling
Ideal for applications with tight tolerances, such as aftermarket turbo setups
Universal design allows for versatile installation
Crafted in Italy for quality assurance
Compact size with powerful airflow capacity

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Spal Universal 16" Electric Fan - Black

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T#:583649

Part#: 30102048

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$ 207.99 USD

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Universal fan that allows increased cooling capacity and shroudless design. 1959 CFM.

Mishimoto Silicone Radiator Hose Kit - Black - E46 M3

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T#:378442

Part#: MMHOSEE4699BK

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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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