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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Coolant Expansion Tank - E46 (non-M), X3, X5 3.0

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T#:338020

Part#: 17117573781

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Sale - Save 10% $ 137.99

This product was last offered at the strikethrough price on
08-26-2026

Starting at $ 123.98 USD

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Starting at $ 123.98 USD

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This coolant reservoir is for the non-M E46 3-series models from 1999-2006 (M3 takes a different expansion tank). 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. This is the most recent expansion tank design from Hella-Behr, the OEM supplier to BMW. It replaces the original BMW part number 17137787039.

Other items to consider replacing at the same time are the radiator cap, coolant level sensor, lower radiator hose, coolant temp sensor in the lower hose, and the hose clamps. If your car has an automatic transmission you should also replace the oil cooler thermostat in the radiator frame, which is a common source for leaks.

This coolant expansion tank fits:

1999-2006 E46 3 series - 323i, 323Ci, 325i, 325Ci, 325xi, 328i, 328Ci, 330i, 330Ci & 330xi (**no M)
2004-2008 X3 SAV - X3 2.5, X3 3.0, X3 3.0si
2000-2005 X5 SAV - X5 3.0

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

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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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Coolant Expansion Tank - E36/E39/Z3 6 cylinder 1992-1998

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T#:338018

Part#: 17111723520

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$ 99.99

This product was last offered at the strikethrough price on
10-22-2026

Starting at $ 63.18 USD

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Starting at $ 63.18 USD

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This high quality BEHR brand expansion tank is used on M50, M52, S50 and S52 engines, and is a common failure item on all E36 3 series with 6 cylinder engines (325/328/323 and M3) 1992-1999, Z3 with 2.8 liter, MZ3 Roadster/Coupe (S52), and E39 528i from 1997-1998. BEHR was the original equipment supplier to BMW, so you know the BEHR made expansion tank will be the highest quality available. Be leary of competitors selling this part for less -- is it a BEHR? Probably not. We only carry the BEHR brand expansion tank as it is the only one we use in our own BMWs.

If you are overhauling your coolant system, now is the time to consider preventative replacing this expansion tank. These are known to go bad, causing a leak which can leave you stranded. 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.

Need a new coolant level sensor too? If your coolant level sender is bad, your on board computer will constantly display a "low coolant" message (unless your coolant is actually low...). If you're replacing your expansion tank, now is a great time to replace this failure prone sensor. If you want a new coolant level sensor, simply choose from the option below. Because there are different sensors for different year/model BMWs, please be as specific as possible when you give us your car info during checkout (model, year, production date). Thanks!

This item fits the following BMWs:
1992-1998 E36 BMW 323ic 325i 325is 325ic 328i 328is 328ic M3
1997-1998 E39 BMW 528i
1997-1998 Z3 BMW Z3 2.8
1998-2000 Z3 BMW M Roadster M Coupe (S52)

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ECS Cooling System Refresh Kit - Level 2

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T#:15677514

Part#: 11281706545-KT

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Sale - Save 3% $ 474.99

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05-03-2026

$ 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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ECS Cooling System Refresh Kit - Level 1

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T#:15677493

Part#: 11517527910-KT

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$ 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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Expansion Tank Replacement Kit - E60 M5,E63 M6

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T#:584232

Part#: 17112283345KT

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$ 250.99 USD

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The expansion tank in your BMW is a vital component of the cooling system, and because of the constant abuse from heat and temperature changes, it often fails. This kit contains all of the basic items needed for a tank replacement.

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N52 ECS Cooling System Refresh Kit - E8x E9x

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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

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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

This product was last offered at the strikethrough price on
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

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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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Cooling System Refresh Kit - Level 2

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T#:15677500

Part#: 82141467704-KT

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$ 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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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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ECS Tuning Aluminum Coolant Bleeder Screw

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T#:363070

Part#: 003530ECS01A

Ships on Nov 12, 2026

Sale - Save 25% $ 35.99

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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

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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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$ 104.99 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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Titanium Coolant Bleeder Screw Upgrade

T#:38621407

Part#: BMS-TCBS

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$ 25.00 USD

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$ 25.00 USD

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Replace your fragile OEM plastic coolant bleeder screw, which is prone to cracking and failure, with a premium titanium upgrade built for strength and style under the hood. Factory plastic components weaken over time due to constant heat cycles, leading to brittleness and potential failure. Our titanium replacement delivers superior durability, being twice as strong as aluminum yet 45% lighter than steel, ensuring unmatched resilience and long-term reliability for your coolant system. More than an upgrade, it’s a must-have for engine longevity. CNC-machined from solid titanium, each screw features a laser-etched Burger Motorsports logo and is hand-burned to create unique color patterns—no two are alike. A heavy-duty replacement O-ring is included for a perfect fit.

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BMW E9X Z4 E8X Coolant Expansion Tank

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T#:402142

Part#: 17137640514

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$ 70.99

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06-22-2026

$ 70.35 USD

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Includes level sensor

Coolant Expansion Tank

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T#:592020

Part#: 17137640515

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$ 97.99 USD

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$ 97.99 USD

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Includes level sensor

Engine Coolant Expansion Tank

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T#:30729009

Part#: 17138677649

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

$ 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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Meyle Coolant Expansion Tank - E53 X5, E46 M52/54, E83 X3

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We Price Match - Give Us A Call or Chat!

T#:369184

Part#: 17117573781

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$ 66.99 USD

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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.

Other items to consider replacing at the same time are the radiator cap, coolant level sensor, lower radiator hose, coolant temp sensor, and the hose clamps. If your car has an automatic transmission you should also replace the oil cooler thermostat in the radiator frame, which is a common source for leaks.

As a leading source of high-performance BMW parts and accessories since 1993, we at Turner Motorsport are honored to be the go-to supplier for tens of thousands of enthusiasts the world over. With over two decades of parts, service, and racing experience under our belt, we provide only quality performance and replacement parts. All of our performance parts are those we would (and do!) install and run on our own cars, as well as replacement parts that are Genuine BMW or from OEM manufacturers. We only offer parts we know you can trust to perform!

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Rein Coolant Expansion Tank - E46, E53, E83

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T#:402141

Part#: 17117573781

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$ 76.39 USD

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Includes cap and level sensor

Coolant Expansion Tank - 17111436381

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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 ...

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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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05-03-2026

$ 38.34 USD

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OEM Rein Expansion Tank - F01,F06,F10,F12,F13

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T#:555024

Part#: 17137647283

Ships in 1 Business Day

$ 118.99

This product was last offered at the strikethrough price on
10-22-2026

$ 77.95 USD

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Replace your damaged expansion tank to prevent coolant loss or potential overheating issues.

his item fits the following BMW Chassis:
F01,F02,F06,F10,F12,F13

Fits BMW Engines including:
N54,N55,N57N

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BMW Coolant Expansion Tank - 17137642160

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T#:45791749

Part#: 17137642160

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$ 85.00

This product was last offered at the strikethrough price on
04-28-2026

$ 79.99 USD

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Expansion tanks take constant abuse from high heat and harsh coolant, making them prone to cracking or failure over time. A damaged tank can quickly lead to overheating and serious engine damage, so replacement is critical at the first sign of trouble. Features: Direct fitment for hassle-free installation Precision-molded to OE specs for perfect sensor and hose connections Durable construction stands up to extreme heat and coolant chemicals Factory pressure-tested for reliable performance

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Coolant Expansion Tank

2X Entries Into Our F80 M3 Sweepstakes

T#:591959

Part#: 17111741167

Ships in 1 Business Day

$ 69.99

This product was last offered at the strikethrough price on
10-22-2026

$ 54.59 USD

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Plastic has a limited lifespan - replace every 80,000 miles

Coolant Expansion Tank

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T#:388723

Part#: 17137823626

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$ 78.99

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10-15-2026

$ 47.59 USD

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Mounts towards the front of the engine bay

Coolant Expansion Tank W/O Cap

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T#:639188

Part#: 17137529273

In Stock

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

$ 32.94 USD

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Expansion Tank Mounting Plate

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T#:402140

Part#: 17111436250

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$ 70.99

This product was last offered at the strikethrough price on
10-22-2026

$ 58.29 USD

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BMW E39 Coolant Expansion Tank

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T#:388645

Part#: 17111436381

In Stock at Vendor

$ 87.99 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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Charge Air Cooler Expansion Tank - Rein | BMW F22/23, F3X B48/B46 B58...

2X Entries Into Our F80 M3 Sweepstakes

T#:38229110

Part#: 17138617045

Ships in 3 Business Days

$ 73.99 USD

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Charge Air Cooler Expansion Tank - Rein | BMW F22/23, F3X B48/B46 B58 is an essential component that ensures proper coolant circulation in the charge air cooling system. Acting as a reservoir, this expansion tank allows coolant to expand and contract with temperature fluctuations, preventing excessive pressure buildup. Over time, plastic tanks can become brittle due to constant exposure to heat cycles, leading to cracks and leaks. A failing tank can cause coolant loss, reducing the efficiency of the charge air cooler and leading to increased intake temperatures, which negatively impact horsepower and engine performance. Rein offers a high-quality direct replacement designed for durability and a perfect fit on BMW F22, F23, and F3X models with B48, B46, and B58 engines.

Maintains proper coolant circulation within the charge air cooling system
Prevents excessive pressure buildup caused by temperature fluctuations
Durable construction resists cracking and leaks for long-lasting performance
Direct replacement for BMW F22, F23, and F3X models with B48, B46, and B58 engines
Helps maintain optimal intake air temperatures, preserving horsepower and efficiency
OE-quality fitment ensures hassle-free installation and reliable function

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BMW Expansion Tank With Cap - 17107514964

2X Entries Into Our F80 M3 Sweepstakes

T#:46616026

Part#: EPK0025

Ships in 3 Business Days

$ 74.99 USD

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$ 74.99 USD

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The coolant expansion tank provides a place for excess coolant to flow as temperatures rise and fall. Because it’s exposed to constant heat cycles and pressure changes, it can eventually crack, split, or suffer damage to its nipples or mounting points. Keeping coolant properly contained within the system is essential, so if your tank shows signs of wear or damage, replacement is necessary. This direct-fit replacement installs easily and delivers the same heating and cooling performance as the factory unit. When replacing the tank, be sure to have additional coolant on hand. ECS Tuning carries a full range of vehicle-specific coolants designed to meet OEM specifications. Most German vehicles require specialized formulas—using the correct coolant will help prevent corrosion and ensure long-term reliability.

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Rein Expansion Tank Mounting Plate - E83

2X Entries Into Our F80 M3 Sweepstakes

T#:402421

Part#: 17113400017

Ships in 1 Business Day

$ 166.99

This product was last offered at the strikethrough price on
10-20-2026

$ 63.95 USD

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$ 63.95 USD

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Secures the expansion tank to the radiator

AutoTecknic Dry Carbon Coolant Expansion Tank Cap Cover - Gloss Carbo...

T#:39497984

Part#: BM-0803-GC

In Stock

$ 74.99 USD

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$ 74.99 USD

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Turner Motorsport offers the AutoTecknic Dry Carbon Coolant Expansion Tank Cap Cover - Gloss Carbon as the perfect addition for BMW owners looking to elevate their engine bay’s appearance with premium materials and precision engineering.

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Rein Engine Coolant Reservoir - BMW G1X, G3X

2X Entries Into Our F80 M3 Sweepstakes

T#:52516268

Part#: EPT0274

Ships in 3 Business Days

$ 114.99 USD

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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.

Rein Coolant Expansion Tank - E60, E61, E63, E64

2X Entries Into Our F80 M3 Sweepstakes

T#:402160

Part#: 17137542986

Ships in 1 Business Day

$ 82.99

This product was last offered at the strikethrough price on
10-22-2026

$ 66.09 USD

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$ 66.09 USD

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Includes fluid level sensor

Expansion Tank

2X Entries Into Our F80 M3 Sweepstakes

T#:592015

Part#: 17137501959

Ships in 3 Business Days

$ 74.99

This product was last offered at the strikethrough price on
10-22-2026

$ 55.99 USD

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Qty

$ 55.99 USD

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Includes vent screw and leveling switch

Coolant Expansion Tank

2X Entries Into Our F80 M3 Sweepstakes

T#:591949

Part#: 17107514964

Back Ordered

$ 80.99

This product was last offered at the strikethrough price on
10-22-2026

$ 58.95 USD

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Qty

$ 58.95 USD

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Includes bleeder screw

OEM Rein Expansion Tank - E90 335d

2X Entries Into Our F80 M3 Sweepstakes

T#:555023

Part#: 17138570079

Ships in 3 Business Days

$ 124.99

This product was last offered at the strikethrough price on
10-22-2026

$ 82.99 USD

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$ 82.99 USD

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Replace your damaged expansion tank to prevent coolant loss or potential overheating issues.

This item fits the following BMW Chassis:
E90

Fits BMW Engines including:
M57

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Rein Coolant Expansion Tank - E70

2X Entries Into Our F80 M3 Sweepstakes

T#:592030

Part#: 17138621092

In Stock at Vendor

$ 100.99

This product was last offered at the strikethrough price on
10-22-2026

$ 68.39 USD

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Qty

$ 68.39 USD

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Replace your cracked or faded tank

Bremmen Parts Water Pipe Connector - E83, Z4

10X Entries Into Our F80 M3 Sweepstakes

T#:1195932

Part#: 17112248409

Ships on Nov 10, 2026

Sale - Save 3% $ 31.61

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

$ 30.66 USD

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Qty

Sale - Save 3%

$ 31.61

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

$ 30.66 USD

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Located underneath the expansion tank

Meyle Coolant Expansion Tank - E36, E39, Z3

5X Entries Into Our F80 M3 Sweepstakes
We Price Match - Give Us A Call or Chat!

T#:556111

Part#: 17111723520

Ships on Nov 16, 2026

$ 34.99 USD

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$ 34.99 USD

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Does not include cap or coolant level sensor

OEM Rein Coolant Expansion Tank Overflow Hose - BMW G01 G02 Gen1 B46/...

2X Entries Into Our F80 M3 Sweepstakes

T#:45757470

Part#: 17125A022D6

Back Ordered

$ 35.99 USD

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Qty

$ 35.99 USD

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This hose connects the expansion tank to the radiator. If your coolant expansion tank hose is cracked or leaking, replace it early to prevent further coolant loss and eventual overheating.

Rein Expansion Tank Mounting Plate - E46, Z4

2X Entries Into Our F80 M3 Sweepstakes

T#:402139

Part#: 17111436251

Ships in 1 Business Day

$ 80.99

This product was last offered at the strikethrough price on
10-22-2026

$ 62.79 USD

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$ 62.79 USD

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Mounts to the side of the radiator for retaining the expansion tank

Expansion Tank

2X Entries Into Our F80 M3 Sweepstakes

T#:593074

Part#: 17137601948

Ships in 3 Business Days

$ 118.99

This product was last offered at the strikethrough price on
10-22-2026

$ 84.09 USD

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$ 84.09 USD

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Cooling system expansion tank

Coolant Expansion Tank Cap

10X Entries Into Our F80 M3 Sweepstakes

T#:36032339

Part#: 17117639020

In Stock

Sale - Save 20% $ 14.99

This product was last offered at the strikethrough price on
09-17-2026

$ 11.99 USD

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Qty

Sale - Save 20%

$ 14.99

This product was last offered at the strikethrough price on
09-17-2026

$ 11.99 USD

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BMW Expansion Tank With Cap - 17137601948

2X Entries Into Our F80 M3 Sweepstakes

T#:46616024

Part#: EPK0141

In Stock

$ 97.99

This product was last offered at the strikethrough price on
06-01-2026

$ 87.99 USD

Limited Qty Sale

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Qty

$ 97.99

This product was last offered at the strikethrough price on
06-01-2026

$ 87.99 USD

Limited Qty Sale

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The coolant expansion tank provides a reservoir for excess coolant as it expands and contracts with temperature fluctuations. Constant exposure to these extreme changes can eventually cause the tank to crack or fail.

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Meyle Expansion Tank Cap

5X Entries Into Our F80 M3 Sweepstakes
We Price Match - Give Us A Call or Chat!

T#:579357

Part#: 3148009004

In Stock

Sale - Save 40% $ 14.99

This product was last offered at the strikethrough price on
05-15-2026

$ 8.99 USD

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Qty

Sale - Save 40%

$ 14.99

This product was last offered at the strikethrough price on
05-15-2026

$ 8.99 USD

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Replace worn or missing pieces.

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