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BMW Cooling System Parts & Accessories for BMW 3 Series E91 (2006-2012)

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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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Black Magic Parts Cylinder Head Coolant Flange - BMW N52 N54 N55 3.0L...

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T#:38094360

Part#: 601-0003

In Stock

$ 24.99 USD

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$ 24.99 USD

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The Black Market Parts (by Precision Raceworks) BMW Billet Coolant Flange was designed as a replacement for the factory plastic flange that is found in the hose that connects the thermostat to the cylinder head. The plastic flange commonly cracks, which leads to coolant loss and engine overheating. Replace your coolant flange before disaster occurs and leaves you stuck on the side of the road.

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BMW Blue Engine Coolant Reservoir Cap

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T#:38161689

Part#: 201-0393-BLU

Ships in 7 Business Days

$ 115.99

This product was last offered at the strikethrough price on
01-22-2026

$ 109.99 USD

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BMW Blue Engine Coolant Reservoir Cap is the perfect upgrade for BMW owners looking to enhance both the performance and appearance of their engine bay. Constructed from high-quality billet aluminum, this cap replaces the flimsy plastic factory cap, offering improved durability and a sleek, high-performance aesthetic.

Designed with precision, this coolant reservoir cap incorporates the OEM pressure relief function to maintain proper cooling system operation. Unlike inferior stick-on covers that may loosen over time, this cap is a complete replacement, ensuring a secure, leak-free fit. The blue anodized finish provides superior corrosion resistance, making it a reliable upgrade for daily drivers and track enthusiasts alike.

OEM pressure relief function – Ensures proper cooling system performance and safety
Billet aluminum construction – Provides enhanced durability and strength over factory plastic caps
Direct-fit replacement – Fully replaces the stock cap for a precise, secure fit
Blue anodized finish – Resists corrosion, heat, and wear for long-lasting performance
Motorsport-inspired design – Adds a sleek, professional look to the engine bay
Built for longevity – Engineered to withstand extreme temperatures and coolant exposure

Upgrade your BMW’s cooling system with the BMW Blue Engine Coolant Reservoir Cap, designed for superior reliability and style.

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BMW Black Engine Coolant Reservoir Cap

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T#:38161688

Part#: 201-0393-BLK

Ships in 9 Business Days

$ 115.99

This product was last offered at the strikethrough price on
01-22-2026

$ 109.99 USD

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$ 109.99 USD

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BMW Black Engine Coolant Reservoir Cap is a premium upgrade designed to enhance both the functionality and aesthetics of your BMW’s engine bay. Unlike flimsy plastic OEM caps, this high-performance cap is CNC-machined from durable billet aluminum, providing long-lasting strength and a sleek, motorsport-inspired look.

Built with precision, this cap retains the essential OEM pressure release function, ensuring proper cooling system operation without compromise. Unlike inferior adhesive covers that may detach over time, this cap fully replaces the factory component, delivering a secure and reliable fit. With a corrosion-resistant black anodized finish, it withstands extreme temperatures and harsh conditions while elevating your BMW’s under-hood appearance.

OEM pressure regulation – Maintains factory-designed pressure release for optimal cooling performance
CNC-machined billet aluminum – Provides exceptional durability and long-term reliability
Direct replacement – Fully replaces the stock cap, ensuring a perfect fit without modifications
Corrosion-resistant anodized finish – Prevents wear and adds a stealthy, high-performance look
Heat and fluid-resistant design – Built to withstand extreme temperatures and coolant exposure
Enhanced engine bay styling – Offers a sleek, motorsport-inspired upgrade

Upgrade your BMW’s cooling system with the BMW Black Engine Coolant Reservoir Cap, designed for superior performance and long-lasting durability.

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BMW Silver Engine Coolant Reservoir Cap

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T#:38161691

Part#: 201-0393-SIL

Ships in 8 Business Days

$ 115.99

This product was last offered at the strikethrough price on
01-22-2026

$ 109.99 USD

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$ 109.99 USD

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BMW Silver Engine Coolant Reservoir Cap is a premium upgrade for BMW owners looking to enhance both the performance and appearance of their engine bay. Crafted from high-strength billet aluminum, this cap replaces the factory plastic version, offering superior durability and a refined, professional look.

Designed with functionality in mind, it integrates the OEM pressure relief system to ensure your engine's cooling system remains safe and efficient. Unlike adhesive covers, which can peel or wear over time, this cap is a direct-fit replacement, providing a secure and leak-proof seal. The silver anodized finish not only enhances the visual appeal but also ensures resistance to corrosion, high temperatures, and wear, making it perfect for daily driving and track use.

OEM pressure relief integration – Maintains proper cooling system performance and reliability
Durable billet aluminum – Outperforms factory plastic caps in longevity and strength
Precision-machined for perfect fitment – Replaces the stock cap securely, not just a cover
Anodized silver finish – Offers corrosion, heat, and wear resistance
Elevates engine bay aesthetics – Adds a clean, professional appearance
Built for both street and track use – Designed to withstand extreme conditions

Enhance your BMW’s cooling system with the BMW Silver Engine Coolant Reservoir Cap, providing both style and functionality for years to come.

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Coolant Expansion Tank

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T#:54959296

Part#: 314 223 0004

Ships on Oct 30, 2026

$ 75.99 USD

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$ 75.99 USD

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This Meyle original-quality expansion tank provides a durable, reliable solution to get your cooling system back to performing exactly as it should.

Auxillary Fan Switch

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T#:4934936

Part#: 3148210000

Special Order: No Guaranteed ETA

$ 18.99 USD

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$ 18.99 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. Also known as the coolant temperature sending unit, comes with related o-ring

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Meyle Coolant Hose - BMW N52 3.0L

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T#:35829327

Part#: 11537521049

Special Order: No Guaranteed ETA

$ 19.99 USD

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$ 19.99 USD

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Over time, coolant hoses in your vehicle can deteriorate due to prolonged exposure to high temperatures from the coolant. Made of reinforced rubber, these hoses are prone to issues such as splitting at hose clamps, swelling, cracking, or even breaking, which can leave you stranded. It's important to replace them at the first sign of wear to prevent coolant loss and ensure your engine stays properly cooled.

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Meyle - Coolant Inlet Hose Section for various BMW models

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T#:40478168

Part#: 11537516414

Special Order: No Guaranteed ETA

$ 7.99 USD

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$ 7.99 USD

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This Meyle component offers OEM-level fit and function for hassle-free installation and dependable cooling system performance.

Fluid Level Sensor

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T#:5973204

Part#: 17117546548

Special Order: No Guaranteed ETA

$ 13.99 USD

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$ 13.99 USD

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MEYLE-ORIGINAL: True to OE fluid level sensor. Used in multiple locations. Wulf Gaertner Autoparts AG manufactures and markets automotive spare parts under its MEYLE brand. Since its foundation in 1958, Wulf Gaertner Autoparts has been an owner-operated, unlisted family business on the aftermarket scene. Since 1995, Wulf Gaertner Autoparts AG has been manufacturing and trading under its MEYLE brand. They pride themselves on top-grade quality-tested spare parts for passenger cars, vans and commercial vehicles. Comparable OE Cross Reference - 17117546548

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Coolant Thermostat

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T#:55461389

Part#: 11537549476

Special Order: No Guaranteed ETA

$ 81.99 USD

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$ 81.99 USD

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This Meyle coolant thermostat provides a refresh for your thermal management system, keeping your engine operating exactly where the engineers intended.

Electric Water Pump

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T#:54959290

Part#: 313 220 0017

Special Order: No Guaranteed ETA

$ 326.99 USD

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$ 326.99 USD

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Whether you are daily driving or doing a preventative cooling overhaul, this high-quality replacement pump includes fresh mounting hardware to ensure your BMW's cooling system remains reliable.

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