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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 Auxiliary Fan Assembly - E46 M3

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T#:20181

Part#: 64546988914

Ships in 6 Business Days

2% off MSRP $ 938.99

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

$ 915.99 USD

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2% off MSRP

$ 938.99

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

$ 915.99 USD

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This electric auxiliary fan for BMW E46 mounts in front of the radiator and is designed to push air through the A/C Condenser and main radiator. It provides additional cooling for when the car is in traffic. It is a common failure item. If your engine temps are creeping up or if your A/C isn't blowing cold this could be the cause.

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

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Genuine BMW Coolant hose - E46 M3

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T#:150725

Part#: 64216902678

Ships in 3 Business Days

2% off MSRP $ 55.99

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

$ 54.99 USD

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2% off MSRP

$ 55.99

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

$ 54.99 USD

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

Hex Bolt & Washer Kit

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T#:55245856

Part#: 0711990XXKTKT

Ships in 6 Business Days

$ 35.31 USD

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$ 35.31 USD

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Turner Motorsport offers this Genuine BMW Hex Bolt and Washer Kit to keep your chassis maintenance or engine refresh completely up to factory standard.

Fan Clutch Wrench - 32mm

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T#:641760

Part#: CTAA878

Ships on Jul 29, 2026

$ 23.57 USD

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$ 23.57 USD

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Use to remove and install Fan Clutch Assemblies when replacing Water Pumps or doing other Engine Services

DO88 Coolant Hoses - Black - E46 M3

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T#:13924829

Part#: DO88KIT70S

Ships on Jul 30, 2026

$ 256.99 USD

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$ 256.99 USD

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Made out of high-quality silicone, these hoses display the highest levels of durability and quality. With three to five layers of armory the hoses are designed to withstand high pressure and heat for an extended period of time. The OE hoses are known to crack and leak but this hose kit eliminates any chance of that.

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Aluminum Radiator - Red Hose - E46 M3

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T#:13891810

Part#: WC310R

Ships on Jul 30, 2026

$ 735.99 USD

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$ 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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BMW E46 M3 Aluminum Shroud With 16″ Fan - with Two Speed Fan Kit ...

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T#:55533523

Part#: RAD-17-SHR

Ships on Aug 5, 2026

$ 505.00 USD

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$ 505.00 USD

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Nissens Radiator - E46

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T#:394205

Part#: 17102228941

Special Order: No Guaranteed ETA

$ 619.99 USD

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$ 619.99 USD

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Aftermarket radiator for your E46 M3

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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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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Bremmen Parts Water Pump - E46 M3 S54

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T#:36981065

Part#: 11517838159

Ships on Dec 2, 2026

Sale - Save 20% $ 138.99

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

$ 110.97 USD

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Sale - Save 20%

$ 138.99

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

$ 110.97 USD

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A failing water pump is a recipe for engine overheating and costly internal damage. Keep your coolant flowing and your engine protected by replacing your aging pump with this high-quality OE unit from Bremmen Parts.

Water pump replacement is suggested at 60,000 - 80,000 miles.

This pump includes the alignment dowel, sealing gasket, and thermostat sealing o-ring. We recommend picking up a water pipe sealing o-ring (11537830712) and thermostat (11531318274) for a comprehensive service.

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Gates Radiator Hose - Upper - E46

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T#:362110

Part#: 11537830716

In Stock at Vendor

$ 48.99

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

$ 46.99 USD

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$ 46.99 USD

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Connects the radiator to the thermostat housing

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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