BMW Coolant Expansion Tanks

Expansion Tank Replacement Kit

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T#:15744017

Part#: N524ECSTNKKT-KT

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10-20-2026

$ 100.95 USD

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The coolant expansion tank in your vehicle gives additional fluid a place to go after expansion and contraction from temperature change. Because it is subjected to such drastic changes on a regular basis, it can often crack or break. You want to keep all the coolant in your vehicle in the cooling system. If your tank has experienced damage such as cracking, nipples breaking off, or mounting point damage, you will need to replace it. The kit includes: Expansion tank with level sensor URO expansion tank cap Genuine BMW expansion tank grommet Genuine BMW mounting bolts

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

10X Entries Into Our F80 M3 Sweepstakes

T#:27605427

Part#: 17138677649TKT

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Sale - Save 3% $ 208.99

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05-03-2026

$ 202.62 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

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ECS Cooling System Refresh Kit - Level 1

10X Entries Into Our F80 M3 Sweepstakes

T#:15677493

Part#: 11517527910-KT

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05-03-2026

$ 323.65 USD

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Stop the problems before they arise. If you vehicle has 80,000 miles or more, replace all of these components to ensure that your vehicle stays healthy. To keep everything in top order, continue to replace these components at 80,000 mile intervals. Water pump failure, cracked plastic housings, and expansion tank leaks will not be a concern once all these problem parts are replaced. This kit was put together by Turner including the basic parts that need replaced. Water pump with metal impeller Fan switch Thermostat and thermostat housing Sealing gaskets Expansion tank with level sensor, clamp and cap 1 Gallon Coolant Upper & lower radiator hoses

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ECS Cooling System Refresh Kit - Level 2

10X Entries Into Our F80 M3 Sweepstakes

T#:15677514

Part#: 11281706545-KT

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$ 460.17 USD

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Stop the problems before they arise. If your BMW has 80,000 miles or more, replace all of these components to ensure that your vehicle stays healthy. Avoid water pump failure, cracked thermostat housings, and expansion tank leaks, which all lead to overheating and subsequent damage. This kit was put together by Turner for a complete cooling system service. GEBA water pump with metal impeller ECS aluminum water pump pulley Fan switch Thermostat and thermostat housing Sealing gaskets Expansion tank with level sensor, clamp and cap 1 Gallon Coolant Upper & lower radiator hoses Accessory drive belts Radiator drain plug

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N52 ECS Cooling System Refresh Kit - E8x E9x

10X Entries Into Our F80 M3 Sweepstakes

T#:59440849

Part#: TWTRPMPPIEBRPRKT

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$ 665.99 USD

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Be sure your cooling system is up to the task

ECS Cooling System Refresh Kit - Level 2

10X Entries Into Our F80 M3 Sweepstakes

T#:15710821

Part#: 17137607482-KT

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10-13-2026

$ 736.19 USD

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As your mileage increases, so does wear and tear on your engine's cooling components. Cooling system components live a rough life, going through extreme temperature changes and being exposed to the elements. A cooling system failure can, and probably will leave you stranded. Included in this kit Water pump with new bolts Thermostat & housing Expansion tank with level sensor Expansion tank cap 1 Gallon of OEM Coolant Waterpump & thermostat hoses Upper and lower radiator hoses Accessory belt

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Cooling System Refresh Kit - Level 2

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T#:15744066

Part#: 11287837898-KT

Ships on Dec 18, 2026

Sale - Save 3% $ 808.99

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07-15-2026

$ 786.20 USD

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BMW has been designing notoriously failure-prone cooling systems since the late 1980s. The coolant capacity in most BMW engines is not sufficient to accommodate any driving or overheating near red zone temperatures. After the gauge reaches this critical area, it is common for thousands of dollars in damage to occur. Stop the problems before they arise. If your vehicle has 80,000 miles or more, replace all of these components to ensure that your vehicle stays healthy. To keep everything in top order, continue to replace these components at 80,000 mile intervals. Water pump failure, cracked housings, and expansion tank leaks will not be a concern once all these problem parts are replaced. Saleri water pump with metal impeller ECS aluminum water pump pulley Fan switch Vaico Q+ thermostat - made in Germany! Sealing gaskets Expansion tank with level sensor, clamp and cap 1 Gallon Coolant Upper & lower radiator hoses Accessory drive belts Radiator drain plug

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Cooling System Refresh Kit - Level 2 - E9x, E82, E88, Z4

10X Entries Into Our F80 M3 Sweepstakes

T#:42099868

Part#: 11537558523TKT

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05-03-2026

$ 667.28 USD

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Keep your BMW running at the proper temperature and avoid costly engine repairs with the Cooling System Refresh Kit, the complete maintenance solution trusted by enthusiasts and professionals alike.

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Automatic Transmission Thermostat Kit

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T#:57122955

Part#: 17111438819KT2

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10-19-2026

$ 91.86 USD

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Keeping your E53 X5 automatic transmission cool is essential for longevity and peak performance. The factory transmission thermostat circuit relies on plastic housings and o-ring seals that deteriorate over time. When the transmission thermostat fails or it's mounting assembly cracks, coolant loss follows putting your transmission at risk of overheating under load.

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Cooling System Refresh Kit - Level 2

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T#:15677500

Part#: 82141467704-KT

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05-03-2026

$ 669.06 USD

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As your mileage increases, so does wear and tear on your engine's cooling components. Cooling system components live a rough life, going through extreme temperature changes and being exposed to the elements. A cooling system failure can, and probably will leave you stranded. For automatic transmission (or DCT) vehicles only This kit includes: Thermostat with mounting hardware 1 gallon of BMW coolant Water pump with mounting hardware Primary cooling system hoses and radiator hose gasket, and bleeder screw Expansion tank with cap Accessory belt

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Engine Coolant Expansion Tank

10X Entries Into Our F80 M3 Sweepstakes

T#:30729009

Part#: 17138677649

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$ 75.59 USD

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Coolant Expansion Tank

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T#:36032353

Part#: 17111741167

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09-16-2026

$ 51.84 USD

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Coolant Expansion Tank - 17111436381

10X Entries Into Our F80 M3 Sweepstakes

T#:36303285

Part#: 17111436381

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$ 40.00 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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Bav Auto Coolant Expansion Tank - E53 X5, Z3 2.3 2.5i 2.8 3.0i ...

10X Entries Into Our F80 M3 Sweepstakes

T#:640497

Part#: 17107514964

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09-16-2026

$ 55.24 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

10X Entries Into Our F80 M3 Sweepstakes

T#:30728965

Part#: 17137823626

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$ 38.34 USD

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Coolant Expansion Tank W/O Cap

10X Entries Into Our F80 M3 Sweepstakes

T#:639188

Part#: 17137529273

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$ 32.94 USD

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Rein Engine Coolant Reservoir - BMW G1X, G3X

2X Entries Into Our F80 M3 Sweepstakes

T#:52516268

Part#: EPT0274

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$ 114.99 USD

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Protect your BMW investment with the Rein EPT0274 Engine Coolant Reservoir, the professional’s choice for cooling system restoration.

Bremmen Parts Water Pipe Connector - E83, Z4

10X Entries Into Our F80 M3 Sweepstakes

T#:1195932

Part#: 17112248409

Ships on Nov 10, 2026

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$ 30.66 USD

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Located underneath the expansion tank

Coolant Expansion Tank Cap

10X Entries Into Our F80 M3 Sweepstakes

T#:36032339

Part#: 17117639020

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09-17-2026

$ 11.99 USD

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

10X Entries Into Our F80 M3 Sweepstakes

T#:640140

Part#: 17111712788

Ships on Dec 16, 2026

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09-02-2026

$ 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 Level Sensor

10X Entries Into Our F80 M3 Sweepstakes

T#:30728984

Part#: 61311378320

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$ 15.29 USD

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Rein Coolant Expansion Tank Kit - F97 F98 G01 G02 G05 G06 G07 - S58 B...

2X Entries Into Our F80 M3 Sweepstakes

T#:55965839

Part#: 17138610661

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$ 56.99 USD

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Keep your ultimate driving machine cool under pressure with this replacement auxiliary expansion tank from Rein. On modern turbocharged BMWs, the secondary cooling system plays a critical role in managing intake charge air temperatures, making a solid reservoir vital for both spirited street driving and track day reliability.

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Rein Coolant Expansion Tank - F97 F98 G01 G02 G05 G06 G07 - S58 B46 B...

2X Entries Into Our F80 M3 Sweepstakes

T#:55965843

Part#: 171386106612

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$ 49.99 USD

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Keep your ultimate driving machine cool under pressure with this replacement auxiliary expansion tank from Rein. On modern turbocharged BMWs, the secondary cooling system plays a critical role in managing intake charge air temperatures, making a solid reservoir vital for both spirited street driving and track day reliability.

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Rein Coolant Expansion Tank - With Cap

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T#:53891623

Part#: 17135A6A030C

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$ 99.99 USD

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Replace your old brittle expansion tank

Engine Coolant Expansion Tank Cap

2X Entries Into Our F80 M3 Sweepstakes

T#:59038367

Part#: 17135A1BD89

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$ 9.99 USD

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Rein Coolant Expansion Tank With Cap And Level Sensor - BMW F22/23 F3...

2X Entries Into Our F80 M3 Sweepstakes

T#:58782356

Part#: 17137642158K

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$ 76.99 USD

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Eliminate coolant leaks with this brand new reservoir and cap kit from Rein - integrate coolant level sensor included with the coolant reservoir

Coolant Expansion Tank

2X Entries Into Our F80 M3 Sweepstakes

T#:57086700

Part#: 17137642158

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$ 55.99 USD

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The factory expansion tank is one of the most common failure points in modern BMW cooling systems, often failing along seam welds or developing micro-cracks around fluid quick-connect fittings. Replacing a degraded reservoir with this direct-fit Rein expansion tank restores pressure containment, ensures accurate coolant expansion volume, and prevents fluid loss before it turns into severe engine damage.

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Coolant Expansion Tank - With Cap

10X Entries Into Our F80 M3 Sweepstakes

T#:55497428

Part#: 17137640514

Ships on Nov 10, 2026

Sale - Save 10% $ 69.99

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10-08-2026

$ 62.99 USD

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Coolant Expansion Tank

10X Entries Into Our F80 M3 Sweepstakes

T#:45723154

Part#: 17137642158

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05-03-2026

$ 50.99 USD

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E30 Coolant Expansion Tank

10X Entries Into Our F80 M3 Sweepstakes

T#:57507437

Part#: 17111712641

Ships on Jan 11, 2027

Sale - Save 6% $ 49.99

This product was last offered at the strikethrough price on
10-21-2026

$ 46.99 USD

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Coolant Expansion Tank

10X Entries Into Our F80 M3 Sweepstakes

T#:53044121

Part#: 17137601948

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$ 67.49 USD

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MINI F5X F6X Expansion Tank

10X Entries Into Our F80 M3 Sweepstakes

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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