BMW Coolant Expansion Tanks

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

affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms

T#:640140

Part#: 17111712788

In Stock

Sale - Save 39% $ 3.99

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

$ 2.44 USD

Add to Wish List

Qty

Sale - Save 39%

$ 3.99

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

$ 2.44 USD

Add to Wish List

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

affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms

T#:36032339

Part#: 17117639020

In Stock

Sale - Save 20% $ 14.99

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

$ 11.99 USD

Add to Wish List

Qty

Sale - Save 20%

$ 14.99

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

$ 11.99 USD

Add to Wish List

Febi Coolant level sensor - E36, E39

affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms
We Price Match - Give Us A Call or Chat!

T#:382276

Part#: 61318360855

In Stock

Sale - Save 29% $ 18.22

This product was last offered at the strikethrough price on
05-14-2026

$ 12.99 USD

Add to Wish List

Qty

Sale - Save 29%

$ 18.22

This product was last offered at the strikethrough price on
05-14-2026

$ 12.99 USD

Add to Wish List

Monitors the coolant level in the expansion tank

OEM Behr Coolant Expansion Tank Cap - E36 E46 E34 E39 E32 E38 E65 X3 ...

affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms

T#:2766

Part#: 17111742231

In Stock

$ 19.99 USD

Add to Wish List

Qty

$ 19.99 USD

Add to Wish List

This radiator expansion tank cap is used most BMW's from 1991-2006. It is a common failure item. When this item fails, it cannot hold pressure which results in your BMW overheating. If you are overhauling your coolant system, now is the time to consider preventative replacing this cap. It is also referred to as the coolant reservoir cap.

Hailing from Stuttgart, Mahle-Behr specializes in automotive cooling systems. From air conditioning to engine cooling M-B has you covered with OE-quality replacement parts.

This item fits the following BMWs:
1990-1991 E30 BMW 318i 318is 318ic
1992-1998 E36 BMW 318i 318is 318ic 323is 323ic 325i 325is 325ic 328i 328is M3
1999-2005 E46 BMW 323i 323ci 325i 325ci 325xi 328i 328ci 330i 330ci 330xi M3
1989-1995 E34 BMW 530i 535i 540i M5
1991-1995 E34 BMW 525i
1997-2003 E39 BMW 525i 528i 530i 540i M5
1989-1994 E32 BMW 735i 735il 740i 740il 750il
1995-2001 E38 BMW 740i 740il 750il
2002-2008 E65 BMW 745i 745li 750i 750li 760i 760li
1990-1998 E31 BMW 840i 840ci 850i 850ci 850csi
2004-2011 E83 BMW X3 2.5i X3 3.0i X3 3.0si
2000-2006 E53 BMW X5 30.0i X5 4.4i X5 4.6is X5 4.8is
1996-2002 Z3 BMW Z3 1.9 Z3 2.3 Z3 2.5i Z3 2.8 Z3 3.0i M Coupe M Roadster
2003-2008 E85 BMW Z4 2.5i Z4 3.0i Z4 3.0si M Roadster M Coupe
2000-2003 E52 BMW Z8 Z8 Alpina
2007+ E90 BMW 335i & 335xi

Show More Show Less

Coolant Expansion Tank Cap

affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms
2X Entries For Our G87 M2 Sweepstakes! We Price Match - Give Us A Call or Chat!

T#:373591

Part#: 17117521071

In Stock

$ 18.99

This product was last offered at the strikethrough price on
03-09-2026

$ 14.49 USD

Add to Wish List

Qty

$ 14.49 USD

Add to Wish List

Keep that coolant expansion tank sealed

OEM Rein Expansion Tank Cap - BMW E32 E34 E36 E38 E39 E46 & More ...

affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms
2X Entries For Our G87 M2 Sweepstakes! We Price Match - Give Us A Call or Chat!

T#:340541

Part#: 17111742231

In Stock

$ 17.99 USD

Add to Wish List

Qty

$ 17.99 USD

Add to Wish List

This radiator expansion tank cap is used most BMW's from 1991-2006. It is a common failure item. When this item fails, it cannot hold pressure which results in your BMW overheating. If you are overhauling your coolant system, now is the time to consider preventative replacing this cap. It is also referred to as the coolant reservoir cap.

Show More Show Less

Coolant Expansion Tank

affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms
2X Entries For Our G87 M2 Sweepstakes! We Price Match - Give Us A Call or Chat!

T#:17704748

Part#: 17138677649

In Stock

$ 148.99

This product was last offered at the strikethrough price on
03-16-2026

$ 118.99 USD

Add to Wish List

Qty

$ 118.99 USD

Add to Wish List

Coolant Level Sensor

affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms

T#:30728984

Part#: 61311378320

In Stock

Sale - Save 56% $ 34.99

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

$ 15.29 USD

Add to Wish List

Qty

Sale - Save 56%

$ 34.99

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

$ 15.29 USD

Add to Wish List

Rein Expansion Tank Cap

affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms
2X Entries For Our G87 M2 Sweepstakes! We Price Match - Give Us A Call or Chat!

T#:384807

Part#: 17117639021

In Stock

$ 16.99 USD

Add to Wish List

Qty

$ 16.99 USD

Add to Wish List

Cap for plastic expansion tank

Expansion Tank Cap - 1.4 Bar - E36 318i 323i 325i 328i M3

affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms
We Price Match - Give Us A Call or Chat!

T#:340717

Part#: 17111742232

In Stock

$ 24.99

This product was last offered at the strikethrough price on
06-18-2026

$ 15.99 USD

Add to Wish List

Qty

$ 15.99 USD

Add to Wish List

This expansion tank cap, from the E30 325is, is designed to give way at 20 PSI instead of 30 PSI, like the stock cap. In the event the system over-pressurizes, this cap should let go first, potentially saving your radiator, hoses, or other vital cooling system components. While there's no guarantee it will save your radiator, this small part could mean the difference between calling a tow service and making it home, and a little extra insurance never hurt. This cap is a high-quality aftermarket part from an OE supplier.

Fits the Following BMWs:

E36 318i 323i 325i 328i M3

Show More Show Less

Bav Auto Expansion Tank Cap - E36 E46 E34 E39 E32 E38 E65 X3 X5 Z4 ...

affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms

T#:640208

Part#: 17117639022

In Stock

Sale - Save 15% $ 13.99

This product was last offered at the strikethrough price on
06-03-2026

$ 11.89 USD

Add to Wish List

Qty

Sale - Save 15%

$ 13.99

This product was last offered at the strikethrough price on
06-03-2026

$ 11.89 USD

Add to Wish List

This radiator expansion tank cap is used most BMW's from 1991-2006. It is a common failure item. When this item fails, it cannot hold pressure which results in your BMW overheating. If you are overhauling your coolant system, now is the time to consider preventative replacing this cap. It is also referred to as the coolant reservoir cap. 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.

Show More Show Less

OEM Rein Expansion Tank w/ Cap - G30 540iX, G32 640iX, G11 740i ...

affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms
2X Entries For Our G87 M2 Sweepstakes! We Price Match - Give Us A Call or Chat!

T#:33946948

Part#: 17139846642

In Stock

$ 99.65 USD

Add to Wish List

Qty

$ 99.65 USD

Add to Wish List

The Expansion Tank is an essential part of your vehicle’s cooling system, designed to accommodate the expansion of coolant as it heats up during engine operation. This high-quality tank helps regulate coolant pressure, preventing overheating and ensuring optimal engine performance. Built to meet or exceed OEM standards, this expansion tank is crafted from durable, heat-resistant materials to provide long-lasting reliability. It offers a direct fit for a wide range of European vehicles, ensuring easy installation.

Prevents Overheating: Manages coolant expansion to maintain consistent engine temperature.
Durable Construction: Made from premium, heat-resistant materials to ensure long-term durability.
OEM Quality Fit: Designed for a precise fit, meeting or exceeding original equipment specifications.
Leak-Proof Design: Provides a secure seal to prevent coolant loss and maintain system efficiency.
Easy Installation: Direct replacement part, compatible with a variety of European vehicle models.

Find the Rein Expansion Tank at Turner Motorsport for top-quality replacement parts and reliable performance.

Show More Show Less

Febi Engine Coolant Expansion Tank Cap - E70, E71, F01, F02, F10 ...

affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms
We Price Match - Give Us A Call or Chat!

T#:377229

Part#: 17132754264

In Stock at Vendor

$ 11.99

This product was last offered at the strikethrough price on
06-08-2026

$ 9.17 USD

Add to Wish List

Qty

$ 9.17 USD

Add to Wish List

Replace the expansion tank cap for your MINI / BMW

Coolant Expansion Tank

affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms
2X Entries For Our G87 M2 Sweepstakes! We Price Match - Give Us A Call or Chat!

T#:377314

Part#: 17137542986

In Stock

$ 55.99 USD

Add to Wish List

Qty

$ 55.99 USD

Add to Wish List

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.

Show More Show Less

Febi Coolant Level Sensor - E31, E38, E39

affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms
We Price Match - Give Us A Call or Chat!

T#:341632

Part#: 61318360876

In Stock

$ 14.99 USD

Add to Wish List

Qty

$ 14.99 USD

Add to Wish List

Monitors the coolant level in the expansion tank

Bav Auto Coolant Level Sensor - BMW E36 E39 M50/52 S50/52

affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms

T#:639793

Part#: 61318360855

In Stock

Sale - Save 19% $ 20.99

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

$ 16.99 USD

Add to Wish List

Qty

Sale - Save 19%

$ 20.99

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

$ 16.99 USD

Add to Wish List

This is the sensor / sending unit that notifies the computer if your coolant level is low. When this fails, it can give a false indication of low coolant -- or worse, not inform you of a low coolant situation that could potentially cause overheating. 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.

Show More Show Less

Coolant Level Sensor

affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms
2X Entries For Our G87 M2 Sweepstakes! We Price Match - Give Us A Call or Chat!

T#:379491

Part#: 61318360855

Ships in 1 Business Day

$ 12.99 USD

Add to Wish List

Qty

$ 12.99 USD

Add to Wish List

Monitors the coolant level in the expansion tank

URO Coolant Expansion Tank w/ Level Sensor - E90 335d

affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms
2X Entries For Our G87 M2 Sweepstakes! We Price Match - Give Us A Call or Chat!

T#:1996203

Part#: 17138570079

Back Ordered

$ 73.99

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

$ 56.99 USD

Limited Qty Sale

Add to Wish List

Qty

$ 73.99

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

$ 56.99 USD

Limited Qty Sale

Add to Wish List

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.

Show More Show Less

BMW Expansion Tank With Cap - 17137601948

affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms

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

Add to Wish List

Qty

$ 97.99

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

$ 87.99 USD

Limited Qty Sale

Add to Wish List

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.

Show More Show Less

Coolant Expansion Tank W/ Cap

affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms
2X Entries For Our G87 M2 Sweepstakes! We Price Match - Give Us A Call or Chat!

T#:598574

Part#: 17137529273

In Stock

$ 37.07

This product was last offered at the strikethrough price on
07-08-2026

$ 33.99 USD

Limited Qty Sale

Add to Wish List

Qty

$ 37.07

This product was last offered at the strikethrough price on
07-08-2026

$ 33.99 USD

Limited Qty Sale

Add to Wish List

OEM Rein Coolant Expansion Tank - F97 F98 G01 G02 B46 B58 S58 ...

affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms
2X Entries For Our G87 M2 Sweepstakes! We Price Match - Give Us A Call or Chat!

T#:39059266

Part#: 17135A6A030

In Stock

$ 86.99

This product was last offered at the strikethrough price on
07-07-2026

$ 75.99 USD

Limited Qty Sale

Add to Wish List

Qty

$ 86.99

This product was last offered at the strikethrough price on
07-07-2026

$ 75.99 USD

Limited Qty Sale

Add to Wish List

Coolant expansion tanks can crack over time, especially during services where they need to be removed. Replace your tank with a brand new tank to ensure your cooling system remains leak-free.

Coolant Level Sensor for Early E36 6-cyl, E34 525i

affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms
We Price Match - Give Us A Call or Chat!

T#:1612

Part#: 61311384739

In Stock

$ 16.99 USD

Add to Wish List

Qty

$ 16.99 USD

Add to Wish List

Coolant Level Sensor. Fits all E34 525i's with the M20 and M50 engine, E36 325 and M3, with a production date of May 1995 or earlier, and E36 328 with a production date of Feb. 1996 or earlier.

Since the late 1800’s Febi has been fabricating replacement metal parts. This history is self evident in the quality and vast amount of applications they service. With more than 34,000 repair solutions for cars and commercial vehicles you can be sure Febi has you covered.

This item fits the following BMWs:
1992-1998 E36 BMW 318i 318is 318ti 318ic
1992-6/1995 E36 BMW 325i 325is 325ic M3
9/1995-3/1996 E36 BMW 328i 328is 328ici
1989-1995 E34 BMW 525i 525i Wagon

Show More Show Less

URO Engine Coolant Expansion Tank Cap - BMW I01 - IB3

affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms
2X Entries For Our G87 M2 Sweepstakes! We Price Match - Give Us A Call or Chat!

T#:373592

Part#: 17132754264

Ships in 1 Business Day

$ 8.19 USD

Add to Wish List

Qty

$ 8.19 USD

Add to Wish List

Replace the expansion tank cap for your MINI / BMW to restore the seal of your cooling system

Intercooler Expansion Tank

affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms
2X Entries For Our G87 M2 Sweepstakes! We Price Match - Give Us A Call or Chat!

T#:584477

Part#: 17137647281

Ships in 3 Business Days

$ 71.99 USD

Add to Wish List

Qty

$ 71.99 USD

Add to Wish List

Rein Expansion Tank Cap - E30, E34

affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms
2X Entries For Our G87 M2 Sweepstakes! We Price Match - Give Us A Call or Chat!

T#:592018

Part#: 17137639023

Ships in 3 Business Days

$ 14.99 USD

Add to Wish List

Qty

$ 14.99 USD

Add to Wish List

1.4 Bar pressure

Expansion Tank - 17137617362

affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms

T#:46478556

Part#: EPT0238

Ships in 3 Business Days

$ 56.99 USD

Add to Wish List

Qty

$ 56.99 USD

Add to Wish List

These expansion tanks tend to leak and will need replaced

BMW Coolant Expansion Tank - 17139485733

affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms

T#:45791753

Part#: 17139485733

Ships in 3 Business Days

$ 64.99

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

$ 52.99 USD

Add to Wish List

Qty

$ 52.99 USD

Add to Wish List

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

Show More Show Less

Expansion Tank Mounting Plate

affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms
2X Entries For Our G87 M2 Sweepstakes! We Price Match - Give Us A Call or Chat!

T#:593026

Part#: 17101439110

Ships in 1 Business Day

$ 68.99 USD

Add to Wish List

Qty

$ 68.99 USD

Add to Wish List

These plastic supports mount to the side of the radiator, and are used to hold the expansion tank in place.

Febi Charge Air Cooler Expansion Tank - BMW F22/23, F3X B48/B46 B58 ...

affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms
We Price Match - Give Us A Call or Chat!

T#:27405536

Part#: 17138617045

Special Order: No Guaranteed ETA

$ 101.99

This product was last offered at the strikethrough price on
05-08-2026

$ 70.99 USD

Add to Wish List

Qty

$ 70.99 USD

Add to Wish List

Your charge air cooler's coolant expansion tank acts as a reservoir, housing extra coolant, and gives fluid a place to go after expansion and contraction from temperature change. Because the plastic tank is subjected to regular temperature changes, the plastic can become brittle over time and will often crack or break. If your tank is leaking and you lose too much coolant, your charge air cooler will not function properly and your air intake temperatures will begin to rise, reducing horsepower and efficiency. If your tank has experienced damage such as cracking, nipples breaking off, or mounting point damage, you will need to replace it.

Show More Show Less

URO Radiator Mounting Plate for Expansion Tank - Z4

affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms
2X Entries For Our G87 M2 Sweepstakes! We Price Match - Give Us A Call or Chat!

T#:639486

Part#: 17112248408

Back Ordered

$ 69.99 USD

Add to Wish List

Qty

$ 69.99 USD

Add to Wish List

URO Parts is one of the leading manufacturers of high quality direct replacement aftermarket components, covering a wide range of makes and models. All of their replacement parts are manufactured to ISO 9000 certification standards, so you can expect long lasting performance from URO Parts. 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! URO Mounting Plate - This item fits the following BMW Chassis: E85,E86 Fits BMW Engines including: M54,N52

Show More Show Less

Coolant Expansion Tank W/ Cap

affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms
2X Entries For Our G87 M2 Sweepstakes! We Price Match - Give Us A Call or Chat!

T#:592210

Part#: 17137529273

In Stock at Vendor

$ 44.99 USD

Add to Wish List

Qty

$ 44.99 USD

Add to Wish List

Meyle Coolant Expansion Tank - F22/23 230/M240, F3X 330/340/430/440 B...

affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms
We Price Match - Give Us A Call or Chat!

T#:5704977

Part#: 17138677649

In Stock at Vendor

$ 164.99

This product was last offered at the strikethrough price on
03-20-2026

$ 123.99 USD

Add to Wish List

Qty

$ 123.99 USD

Add to Wish List

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 fewer than six to eight 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.

Show More Show Less

Rein Engine Coolant Reservoir - BMW G1X, G3X

affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms

T#:52516268

Part#: EPT0274

Back Ordered

$ 114.99 USD

Add to Wish List

Qty

$ 114.99 USD

Add to Wish List

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

Rein Reservoir Hose R50 / R52

affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms
2X Entries For Our G87 M2 Sweepstakes! We Price Match - Give Us A Call or Chat!

T#:34114213

Part#: 17127526414

Ships in 3 Business Days

$ 9.99 USD

Add to Wish List

Qty

$ 9.99 USD

Add to Wish List

Reservoir Hose CHE0885 is a top-quality replacement part designed for BMW vehicles, ensuring a reliable connection between your vehicle’s reservoir and cooling system. Engineered for durability and heat resistance, this hose provides a seamless flow of coolant to maintain optimal engine temperature, preventing overheating. Reservoir Hose CHE0885 is made to meet or exceed OEM specifications, ensuring a perfect fit for your BMW. Available through Turner Motorsport, this hose is an essential component for keeping your vehicle's cooling system functioning efficiently.

High-quality reservoir hose for BMW vehicles
Ensures reliable coolant flow for optimal engine performance
Made from heat-resistant, durable materials
Prevents overheating and engine damage
Meets or exceeds OEM specifications
Perfect fit for a variety of BMW models
Available from trusted supplier Turner Motorsport
Easy to install with secure connections

Show More Show Less

Coolant Expansion Tank

affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms
We Price Match - Give Us A Call or Chat!

T#:16242201

Part#: 17137590626

In Stock at Vendor

$ 123.99

This product was last offered at the strikethrough price on
05-08-2026

$ 120.99 USD

Add to Wish List

Qty

$ 120.99 USD

Add to Wish List

Expansion Tank - Priced Each

affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms
2X Entries For Our G87 M2 Sweepstakes! We Price Match - Give Us A Call or Chat!

T#:639209

Part#: 17138610656

Ships in 1 Business Day

$ 117.99 USD

Add to Wish List

Qty

$ 117.99 USD

Add to Wish List

Replace your leaky coolant tank!

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

affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms
2X Entries For Our G87 M2 Sweepstakes! We Price Match - Give Us A Call or Chat!

T#:402160

Part#: 17137542986

Ships in 1 Business Day

$ 82.99 USD

Add to Wish List

Qty

$ 82.99 USD

Add to Wish List

Includes fluid level sensor

Mishimoto Essentials Bundle - BMW E36 3'

affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms

T#:51039948

Part#: MMB-E36-001

Ships in 3 Business Days

$ 1,141.00 USD

Add to Wish List

Qty

$ 1,141.00 USD

Add to Wish List

Each part in this bundle is selected to improve the E36's fluid dynamics and thermal stability.

Expansion Tank Cap

affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms
2X Entries For Our G87 M2 Sweepstakes! We Price Match - Give Us A Call or Chat!

T#:373099

Part#: 17137516004

Ships in 1 Business Day

$ 15.99

This product was last offered at the strikethrough price on
04-10-2026

$ 10.99 USD

Add to Wish List

Qty

$ 10.99 USD

Add to Wish List

The coolant expansion tank cap keeps necessary pressure on your coolant to increase efficiency. If you have an overheating issue in your vehicle, a simple, quick, and inexpensive part to replace is this cap.

Show More Show Less

BMW Expansion Tank With Cap - 17107514964

affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms

T#:46616026

Part#: EPK0025

Ships in 3 Business Days

$ 74.99 USD

Add to Wish List

Qty

$ 74.99 USD

Add to Wish List

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.

Show More Show Less

Coolant Expansion Tank

affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms
2X Entries For Our G87 M2 Sweepstakes! We Price Match - Give Us A Call or Chat!

T#:593078

Part#: 17138616418

Back Ordered

$ 63.99 USD

Add to Wish List

Qty

$ 63.99 USD

Add to Wish List

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.

Show More Show Less

Coolant Level Switch - E31 E38 E39 Z8

affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms
2X Entries For Our G87 M2 Sweepstakes! We Price Match - Give Us A Call or Chat!

T#:20203

Part#: 61318360876

Ships in 1 Business Day

$ 12.99

This product was last offered at the strikethrough price on
04-10-2026

$ 10.99 USD

Add to Wish List

Qty

$ 10.99 USD

Add to Wish List

This is the radiator coolant level sensor that mounts into the bottom of the cooling system expansion tank. With more than 4,000 European vehicle replacement parts, URO is no stranger to the market. Superior metal stock and extremely strict quality control are at the forefront of URO’s agenda and it shows as they become the OE supplier for more and more car companies every single day.

With more than 4,000 European vehicle replacement parts, URO is no stranger to the market. Superior metal stock and extremely strict quality control are at the forefront of URO’s agenda and it shows as they become the OE supplier for more and more car companies every single day.

This item fits the following BMWs:
1999-2000 E39 BMW 528i 540i
2001-2003 E39 BMW 525i 530i 540i
1995-2001 E38 BMW 740i 740il 750il
1990-1998 E31 BMW 840i 840ci
2000-2003 E52 BMW Z8 Roadster

Show More Show Less

Coolant Expansion Tank

affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms
2X Entries For Our G87 M2 Sweepstakes! We Price Match - Give Us A Call or Chat!

T#:25507167

Part#: 17138742660

Ships in 1 Business Day

$ 136.99 USD

Add to Wish List

Qty

$ 136.99 USD

Add to Wish List

The coolant expansion tank is essential for your vehicle, acting as a reservoir for extra fluid during temperature shifts. However, frequent exposure to extreme conditions makes it susceptible to cracks or breaks. Maintaining all coolant within the system is vital for optimal engine function. If you detect any damage, such as cracks, broken nipples, or compromised mounting points, swift replacement of the tank is necessary to uphold your vehicle's cooling system integrity.

Show More Show Less

URO Coolant Expansion Tank - BMW E30 E36 Z3 M42 M44, E34 325 ...

affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms
2X Entries For Our G87 M2 Sweepstakes! We Price Match - Give Us A Call or Chat!

T#:362008

Part#: 17111712835

Ships in 1 Business Day

$ 18.99 USD

Add to Wish List

Qty

$ 18.99 USD

Add to Wish List

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

Show More Show Less

OEM Rein Coolant Expansion Tank Overflow Hose - BMW G30 530e, G12 740...

affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms

T#:45757471

Part#: 17125A02485

Ships in 3 Business Days

$ 41.99 USD

Add to Wish List

Qty

$ 41.99 USD

Add to Wish List

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.

Expansion Tank Mounting Clamp

affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms
2X Entries For Our G87 M2 Sweepstakes! We Price Match - Give Us A Call or Chat!

T#:591954

Part#: 17111707777

Ships in 1 Business Day

$ 6.99 USD

Add to Wish List

Qty

$ 6.99 USD

Add to Wish List

Locks the expansion tank into the mounting plate via the large hole in the bottom of the tank

Coolant Expansion Tank

affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms

T#:55749607

Part#: 17132284600

Ships in 1 Business Day

$ 168.99 USD

Add to Wish List

Qty

$ 168.99 USD

Add to Wish List

This URO Coolant Expansion Tank is a budget-conscious alternative that's designed to handle the rigorous fluid expansion and pressure demands of your M car.

OEM Mahle-Behr Coolant Expansion Tank Cap - E30 325e/i 1988-91, E34 5...

affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms

T#:369633

Part#: 17111742232

Ships in 1 Business Day

$ 18.99 USD

Add to Wish List

Qty

$ 18.99 USD

Add to Wish List

This radiator expansion tank cap fits E30 325e 325es 325i 325is 325ix 325ic with M20 engine from 1988 . It is a common failure item. When this item fails, it cannot hold pressure which results in your BMW overheating. If you are overhauling your coolant system, now is the time to consider preventative replacing this cap. It is also referred to as the coolant reservoir cap.

This item fits the following BMWs:
1988-1991 E30 BMW 325e 325es 325i 325ic 325is 325ix
1989-1990 E34 BMW 525i with M20 engine

Show More Show Less

Expansion Tank With Cap

affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms

T#:46616025

Part#: EPK0138

Ships in 3 Business Days

$ 71.99 USD

Add to Wish List

Qty

$ 71.99 USD

Add to Wish List

The coolant expansion tank allows excess coolant to flow in and out as temperatures rise and fall. Over time, repeated exposure to extreme temperature changes can cause the tank to crack, split, or break. To keep your cooling system sealed and functioning properly, any tank showing signs of damage—such as cracks, broken nipples, or compromised mounting points—should be replaced.

Show More Show Less