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Bremmen Parts BMW Coolant Expansion Tanks

On certain models, namely E36, E46, and E90, the factory BMW expansion tank is prone to either breaking at connection points or blowing apart altogether. If you're starting to feel like your expansion tank is on borrowed time, it's probably time to replace with either a direct OE replacement, or strengthen your cooling setup with an aluminum expansion tank - we offer numerous performance upgrades for your expansion tank. Especially if you're someone who likes to track your BMW, we recommend upgrading your expansion tank to avoid ruining your track day.

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Coolant Expansion Tank

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T#:36032353

Part#: 17111741167

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05-03-2026

$ 47.32 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

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05-03-2026

$ 75.59 USD

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$ 75.59 USD

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Coolant Expansion Tank

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T#:30728965

Part#: 17137823626

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Sale - Save 20% $ 47.99

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05-03-2026

$ 38.34 USD

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Coolant Expansion Tank - 17111436381

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T#:36303285

Part#: 17111436381

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$ 52.79 USD

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BMW E39 Coolant Expansion Tank is an essential component designed to maintain the proper coolant level in your vehicle's cooling system. Manufactured with high-quality materials, this expansion tank ensures reliable performance and durability, preventing engine overheating by accommodating the expansion of coolant as it heats up. The kit includes a level sensor and cap, providing everything needed for a seamless installation. This expansion tank is specifically engineered to meet the exact specifications of your BMW E39, offering a perfect fit and optimal functionality.

Complete Kit: Includes level sensor and cap for easy installation. High-Quality Construction: Built with durable materials for long-lasting performance. Prevents Overheating: Helps manage coolant expansion, ensuring engine protection. Exact Fit: Designed to meet the precise specifications of your BMW E39. Enhanced Reliability: Ensures proper coolant level maintenance for optimal cooling system function.

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Coolant Expansion Tank W/ Cap

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T#:639188

Part#: 17137529273

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Sale - Save 16% $ 38.99

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05-03-2026

$ 32.94 USD

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Bremmen Parts Water Pipe Connector - E83, Z4

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T#:1195932

Part#: 17112248409

Ships on Jul 24, 2026

Sale - Save 3% $ 31.61

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05-03-2026

$ 30.66 USD

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Located underneath the expansion tank

Coolant Level Sensor

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T#:30728984

Part#: 61311378320

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Sale - Save 56% $ 34.99

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05-03-2026

$ 15.29 USD

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Bremmen Coolant Bleeder Screw - BMW E30 E36 E38 E39 E46 E83 E90 Z4 ...

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T#:640140

Part#: 17111712788

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05-03-2026

$ 2.44 USD

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Plastic bleeder screw for cooling system is used to bleed air that would otherwise create an air pocket and lead to overheating. Includes o-ring seal.

Coolant Expansion Tank Cap

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T#:36032339

Part#: 17117639020

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05-03-2026

$ 11.99 USD

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Bav Auto Coolant Expansion Tank - E53 X5, Z3 2.3 2.5i 2.8 3.0i ...

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T#:640497

Part#: 17107514964

Ships on Aug 25, 2026

Sale - Save 16% $ 63.99

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05-03-2026

$ 53.75 USD

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This radiator expansion tank is used on E53 X5 4.4i and 4.6is with M62 engine, and Z3 2.3 2.5i 2.8 3.0i from 1999-2002. It is a common failure item as the plastic weakens over time and stress cracks will lead to coolant leaks. We have found that the expansion tanks should be replaced based on age as well as condition. Expansion tanks seem to have a lifespan of less than six years before they show signs of fatigue and wear. Pre-emptively replacing the expansion tank as part of an overall maintenance plan can prevent you from getting stranded from a sudden failure later on. From 1974 to 2019, Bavarian Autosport was one of the premier vendors for BMW and MINI auto parts. We are happy to preserve the Bav Auto legacy by continuing to carry their high-quality products into the future. All Bav Auto parts will remain unchanged in design and sourced from the same OEM suppliers to ensure long-lasting reliability. We trust these parts, accessories, and upgrades so confidently that we back every Bavarian Autosport branded component with a 2-year warranty.

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Coolant Expansion Tank

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T#:45723154

Part#: 17137642158

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Sale - Save 21% $ 67.99

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05-03-2026

$ 53.85 USD

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$ 53.85 USD

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Coolant Expansion Tank

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T#:53044121

Part#: 17137601948

Ships on Sep 2, 2026

Sale - Save 15% $ 72.99

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05-03-2026

$ 62.04 USD

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$ 62.04 USD

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MINI F5X F6X Expansion Tank

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T#:28138156

Part#: 17137617362

Special Order: No Guaranteed ETA

Sale - Save 5% $ 81.99

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05-03-2026

$ 77.51 USD

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MINI F5X F6X Expansion Tank

For Mini owners looking to maintain optimal engine performance, the MINI F5X F6X Expansion Tank is an essential component. This expansion tank ensures proper cooling system functionality, preventing overheating and potential engine damage. Crafted with high-quality materials, it guarantees durability and reliability for long-term use, providing peace of mind to Mini enthusiasts.

Ensures proper cooling system functionality
Prevents overheating and potential engine damage
Crafted with high-quality materials for durability
Provides peace of mind to Mini enthusiasts

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Coolant Expansion Tank - With Cap

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T#:55497428

Part#: 17137640514

Ships on Nov 6, 2026

$ 69.99 USD

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$ 69.99 USD

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