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Coolant Expansion Tank Cap

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T#:36032339

Part#: 17117639020

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

$ 11.99 USD

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Engine Coolant Expansion Tank

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T#:30729009

Part#: 17138677649

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Sale - Save 12% $ 85.99

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

$ 75.59 USD

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OEM Coolant Expansion Tanks Kit - F22/23 F3X B48 B58

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T#:27605427

Part#: 17138677649TKT

Ships on Oct 6, 2026

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05-03-2026

$ 173.05 USD

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Genuine BMW expansion tanks have a bad habit of failing after a few years. This has primarily been caused by the plastic construction of the expansion tanks. After enough heat cycles, the plastic becomes brittle and can crack, causing coolant to leak out and air to enter the coolant system. If a failing expansion tank is not addressed soon enough, the coolant loss can lead to an overheating engine. This kit includes two brand new high quality expansion tanks and caps

ECS Tuning Aluminum Coolant Bleeder Screw

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T#:363070

Part#: 003530ECS01A

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

$ 26.99 USD

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Replace the flimsy plastic bleeder screw used in the coolant expansion tank or in one of the cooling system hoses with this high quality, durable, aluminum bleeder screw. The stock plastic screw can deform over time due to heat or even regular use. We have even seen the head of the screw snap off, leaving the threaded body stuck in the expansion tank. This aluminum screw will help to prevent sudden failure of the bleeder screw, which can result in immediate overheating of the car.

ECS Tuning's Aluminum Coolant Bleeder Screw replaces Genuine BMW Part Number 17111712788

Cylinder Head Expansion Tank Hose - Priced Each

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T#:30729010

Part#: 17129845173

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Sale - Save 21% $ 30.99

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05-03-2026

$ 24.47 USD

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ECS Exact-Fit Silicone Expansion Tank Hose - F-Chassis N55

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T#:37892077

Part#: 006402LA03

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Sale - Save 25% $ 104.99

This product was last offered at the strikethrough price on
06-14-2026

$ 78.74 USD

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$ 78.74 USD

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Over time, factory rubber hoses break down and eventually fail as a result of consistent exposure to chemical-rich antifreeze and hot engine bay temperatures. While all coolant hoses are prone to failure, the expansion tank hose is especially susceptible to failure. To fix this issue, ECS has created the ultimate performance hose upgrade! Crafted from heavy-duty, fiber-reinforced silicone, this ECS Exact-Fit Silicone Expansion Tank Hose withstands higher temperatures and greater pressure than the factory rubber alternative. Engineered to resist electrochemical degradation, it’s tested for continuous operation at 250°F and over 45 psi, ensuring improved reliability, enhanced flow, and reduced turbulence. To further improve upon the factory hose design, ECS engineers developed precision-machined billet aluminum "Quick Connect" hose ends. Unlike the OEM plastic counterparts, these robust components resist heat-induced failure, ensuring long-term durability and reliability. Replaces OEM Part Numbers: 17128570061, 17128507235. Installation is straightforward: begin by removing the factory overflow hose and retaining clips. Transfer the OEM metal clips from the factory connector to the new billet fittings, then press the fittings onto the expansion tank and upper coolant hose. The included silicone hose is routed through the OEM path and securely clamped onto the billet fittings. After installation, the fittings can stay in place, only the silicone needs to be removed for future maintenance. Key Benefits: Direct OEM Fitment – Retains factory hose routing while eliminating the weaknesses of rubber construction. High-Temperature Resistance – Silicone material withstands extreme heat and chemicals for long-term durability. 2-Ply, Fiber-Reinforced Fluorosilicone Construction – Provides superior resistance to glycol-based coolant and other harsh fluids. Upgraded Billet Aluminum Quick-Connect Ends – CNC-machined from 6061-T6 aluminum with integrated O-rings, ensuring a secure, leak-free connection that won’t degrade over time. Easy Installation – Includes stainless steel clamps for a hassle-free, bolt-on upgrade.

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Showing 6 results for "coolant expansion tank"

Coolant Expansion Tank Cap

Engine Coolant Expansion Tank

OEM Coolant Expansion Tanks Kit - F22/23 F3X B48 B58

ECS Tuning Aluminum Coolant Bleeder Screw

Cylinder Head Expansion Tank Hose - Priced Each

ECS Exact-Fit Silicone Expansion Tank Hose - F-Chassis N55

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