BMW Coolant Expansion Tanks for BMW Z3 (1996-2002)

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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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Turner Motorsport HD Aluminum Coolant Expansion Tank Kit - M50/M52/S5...
For vehicles produced before 09/1998
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Turner Motorsport - Corporate Logo
T#:9998526
Part#: 008348LA01BKT
Ships on Aug 8, 2025
Sale - Save 25% $ 414.99
$ 311.24 USD
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Sale - Save 25% $ 414.99
$ 311.24 USD
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Our Turner Motorsport's full aluminum expansion tank was designed and engineered in house to help with the weak point in your E36 cooling system. The coolant expansion tank goes through heat cycles over and over again from regular driving, it is important that your expansion tank is doing its job to retain coolant to keep your engine operating temperatures down and keep your engine bay clean. Not only is this a major upgrade but also a great maintenance item to replace. Our expansion tank was designed to fit the OEM hoses for an easy install and comes with all the upgraded items you will need for a clean install,

If your E36 needs a new expansion tank, make sure this is the last expansion tank you ever need to buy. Our coolant expansion tank has a full aluminum construction and wrinkle black powder coat for durability. Expansion tank kit comes with all the accessories you need to replace your expansion tank once, and never have to worry about it again.

Aluminum Coolant Expansion Tank Features:

- Maintains stock coolant capacity and expansion volume

- Designed to maintain OE coolant elevation, preventing air pockets

- Baffled tank ensures that air pockets cannot be introduced during aggressive driving and provides accurate coolant level reading

- Carefully designed bleed passage prevents the introduction of air as the engine cools

- Turner engraved internal fill level

- TIG welded 5052 aluminum construction

- All bungs are machined to fit factory hose ends

Kit contents:

Turner Aluminum Expansion Tank
Coolant level sensor
Expansion tank cap
Heavy duty bleeder screw
Flared coolant pressure release line
Hardware for installation

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Packaged by Turner - Corporate Logo
T#:338018
Part#: 17111723520
In Stock
Starting at $ 86.08 USD
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Starting at $ 86.08 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 Tuning Aluminum Coolant Bleeder Screw
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ECS - Corporate Logo
T#:363070
Part#: 003530ECS01A
Ships on Aug 8, 2025
Sale - Save 40% $ 33.99
$ 20.39 USD
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Sale - Save 40% $ 33.99
$ 20.39 USD
Free Shipping on orders $49 and up

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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Bav Auto Coolant Expansion Tank - E36 E39 Z3 M50 M52 S50 S52 ...
For vehicles with production date up to 08/1998
Bavarian Autosport - Corporate Logo
T#:638094
Part#: 17111723520
In Stock
$ 38.99 USD
Free Shipping on orders $49 and up
$ 38.99 USD
Free Shipping on orders $49 and up
Replace your old expansion tank to prevent potential failure or leaks. Includes a brand new coolant level sensor. 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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Genuine BMW - Corporate Logo
T#:207187
Part#: 17117639022
In Stock
Sale - Save 3% $ 24.99
$ 24.24 USD
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Sale - Save 3% $ 24.99
$ 24.24 USD
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Genuine BMW Radiator Cap - 2,0Bar
This item fits the following BMW Chassis:
E36 M3,E39 M5,E46 M3,E85 Z4M,E53 48IS,E36,E38,E39,E46,E53 X5,E65,E83 X3,E85 Z4,E86 Z4,F06,F10,F12,F13

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Mahle-Behr - Corporate Logo
T#:341101
Part#: 17111723520
In Stock
$ 86.08 USD
Free Shipping on orders $49 and up
$ 86.08 USD
Free Shipping on orders $49 and up
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.

Coolant Expansion Tank
We Price Match - Give Us A Call or Chat!
URO - Corporate Logo
T#:373102
Part#: 17111723520
Ships in 2 Business Days
Sale - Save 6% $ 24.99
$ 23.52 USD
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Sale - Save 6% $ 24.99
$ 23.52 USD
Free Shipping on orders $49 and up
Does not include cap or coolant level sensor
Mahle-Behr - Corporate Logo
T#:2765
Part#: 17107514964
Ships Jul 2, 2025
$ 120.16 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. This is the OEM Behr part - not an aftermarket. We have found that the aftermarket coolant reservoirs fail easier than the OEM Behr part. 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.

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:
2000-2003 X5 BMW X5 4.4i X5 4.6is
1999-2002 Z3 BMW Z3 2.3 2.5i 2.8 3.0i

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Coolant Expansion Tank
We Price Match - Give Us A Call or Chat!
URO - Corporate Logo
T#:377303
Part#: 17107514964
Ships in 2 Business Days
Sale - Save 3% $ 45.48
$ 44.12 USD
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Sale - Save 3% $ 45.48
$ 44.12 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.
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Genuine BMW - Corporate Logo
T#:46115
Part#: 17121719356
Ships Jul 1, 2025
Sale - Save 6% $ 28.99
$ 27.21 USD
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Sale - Save 6% $ 28.99
$ 27.21 USD
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Genuine BMW Cap
This item fits the following BMW Chassis:
E46 M3,E30,E46

Fits BMW Engines including:
M20,S54,S62

Coolant Expansion Tank
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Rein - Corporate Logo
T#:591949
Part#: 17107514964
In Stock
$ 66.99 USD
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$ 66.99 USD
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Includes bleeder screw
Febi Coolant Expansion Tank - E36, E39, Z3
For vehicles with production date up to 08/1998
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Febi - Corporate Logo
T#:363759
Part#: 17111723520
Ships in 3 Business Days
$ 48.99 USD
Free Shipping on orders $49 and up
$ 48.99 USD
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Does not include cap or coolant level sensor


Genuine BMW Coolant Expansion Tank - M50 M52 S50 S52
For vehicles with production date up to 09/1998
Genuine BMW - Corporate Logo
T#:360745
Part#: 17111723520
Ships Jul 1, 2025
6% off MSRP $ 132.99
$ 124.99 USD
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6% off MSRP $ 132.99
$ 124.99 USD
Free Shipping
Genuine BMW - Corporate Logo
T#:360743
Part#: 17111712835
Ships Jul 1, 2025
Sale - Save 4% $ 95.99
$ 92.23 USD
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Sale - Save 4% $ 95.99
$ 92.23 USD
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Genuine BMW - Corporate Logo
T#:20714
Part#: 17102229772
Special Order: No Guaranteed ETA
Sale - Save 3% $ 126.99
$ 122.62 USD
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Sale - Save 3% $ 126.99
$ 122.62 USD
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Replace your damaged expansion tank to prevent coolant loss or potential overheating issues.


This item fits the following BMWs:
BMW M Series - Z3 M Coupe, M Roadster

Fits BMW Engines including:
S54

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Meyle Coolant Expansion Tank - E36, E39, Z3
Up to production date 09/1998
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Meyle - Corporate Logo
T#:556111
Part#: 17111723520
Special Order: No Guaranteed ETA
$ 31.99 USD
Free Shipping on orders $49 and up
$ 31.99 USD
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Does not include cap or coolant level sensor

Mahle-Behr - Corporate Logo
T#:2766
Part#: 17111742231
In Stock
$ 15.99 USD
Free Shipping on orders $49 and up
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
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Mahle-Behr - Corporate Logo
T#:363898
Part#: 17111712835
In Stock
$ 17.99 USD
Free Shipping on orders $49 and up

This high quality Hella/BEHR brand expansion tank is used on M42, M44, M50, M52, engines, and is a common failure item on all E36 3 series with 4 cylinder engines (318i/is/ti/ic) 1990-1999, Z3 with 1.9 liter and E34 525i from 1989-1995. Hella/BEHR was the original equipment supplier to BMW, so you know the Hella/BEHR made expansion tank will be the highest quality available. Be leary of competitors selling this part for less -- is it a Hella/BEHR? Probably not. We only carry the Hella/BEHR brand expansion tank as it is the only one we use in our own BMWs.

Hella is a premium manufacturer that supplies automotive parts to numerous car brands across the world. Everything from electrical to mechanical genuine parts have been made and supplied directly to BMW before the vehicles ever leave the production floor. Their high quality, long lasting parts have made them a trusted brand chosen to help keep your BMW on the road for many years to come.

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!

This item fits the following BMWs:
1990-1991 E30 BMW 318i 318is 318ic
1992-1998 E36 BMW 318i 318is 318ti 318ic
1989-1995 E34 BMW 525i
1996-1998 Z3 BMW Z3 1.9

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Bremmen Parts - Corporate Logo
T#:640140
Part#: 17111712788
In Stock
$ 4.99 USD
Free Shipping on orders $49 and up
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.
Meyle Expansion Tank Cap
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Meyle - Corporate Logo
T#:579357
Part#: 3148009004
In Stock
Sale - Save 38% $ 10.99
$ 6.76 USD
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Sale - Save 38% $ 10.99
$ 6.76 USD
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Replace worn or missing pieces.

Bavarian Autosport - Corporate Logo
T#:640208
Part#: 17117639022
In Stock
Sale - Save 15% $ 11.99
$ 10.19 USD
Free Shipping on orders $49 and up
Sale - Save 15% $ 11.99
$ 10.19 USD
Free Shipping on orders $49 and up
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.
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OEM Rein Expansion Tank Cap - BMW E32 E34 E36 E38 E39 E46 & More ...
2X Entries For Our Spin To Win Sweepstakes! We Price Match - Give Us A Call or Chat!
Rein - Corporate Logo
T#:340541
Part#: 17111742231
Ships Jul 10, 2025
$ 13.99 USD
Free Shipping on orders $49 and up
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.
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2 Pin Connector
10X Entries For Our Spin To Win Sweepstakes!
ECS - Corporate Logo
T#:33412932
Part#: 61132359999
Ships on Aug 11, 2025
Sale - Save 35% $ 9.99
$ 6.49 USD
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Sale - Save 35% $ 9.99
$ 6.49 USD
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Includes connector housing with terminals and seals. Commonly used for the coolant level sensor.

ECS Tuning replacement harness connectors include all necessary pins and wire seals for a complete harness repair. Whether you have a broken harness connector or need a complete wiring repair, we have the components you need.

Each connector includes an additional terminal in case one becomes lost or damaged during installation.

*OEM cross reference PN# 61132359999 - Commonly used for the coolant level sensor.

Please reference the original part number from the existing connector to confirm fitment, before ordering.

Suggested tools:

Suggested crimping pliers: T#387193
Wire De-pin tools:
12pc De-Pin Tool Set - T#386379
23pc De-Pin Tool Set - T#641943

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Bavarian Autosport - Corporate Logo
T#:640497
Part#: 17107514964
Special Order: No Guaranteed ETA
Sale - Save 10% $ 59.99
$ 53.99 USD
Free Shipping on orders $49 and up
Sale - Save 10% $ 59.99
$ 53.99 USD
Free Shipping on orders $49 and up
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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Moroso Performance Aluminum Expansion Tank - E36, Z3
For vehicles with a production date before 09/1998
Moroso - Corporate Logo
T#:568887
Part#: 63791
Back Ordered
$ 415.99 USD
$ 415.99 USD
If you have ever experienced a leaking plastic BMW expansion tank you will realize the value of this aluminum version straight away. Even if a failure has not happened to you, it's easy to tell this tank is much stronger and more durable than the plastic used in the stock design. The original BMW plastic tanks suffer from leaks and failures with no warning. While being lightweight and recyclable the design and construction of the stock tank is just not up for reliable long term use. Moroso coolant expansion tanks are all pressure tested for guaranteed leak-free operation and utilizes the stock pressure cap to prevent excessive pressure in the cooling system from blowing off a radiator hose or seal! Features: Each cooling system expansion tank includes a 1/8 in. pipe overflow fitting at neck, a 1/4 in. NPT water intake bung, and a 1/2 in. bung at the bottom for plumbing a line to the radiator Rugged 6061-T6 billet aluminum filler necks welded to tank to withstand continuous removal and installation of cap 100% pressure tested to eliminate leaks Accepts a standard-size radiator cap
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