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

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

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

10X Entries Into Our F80 M3 Sweepstakes

T#:338018

Part#: 17111723520

Ships in 1 Business Day

$ 99.99

This product was last offered at the strikethrough price on
09-15-2026

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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Coolant Expansion Tank

2X Entries Into Our F80 M3 Sweepstakes

T#:591949

Part#: 17107514964

Back Ordered

$ 80.99 USD

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$ 80.99 USD

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Includes bleeder screw

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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Moroso Performance Aluminum Expansion Tank - E36, Z3

For vehicles with a production date before 09/1998

T#:568887

Part#: 63791

In Stock

$ 445.99

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

$ 418.99 USD

Limited Qty Sale

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Qty

$ 445.99

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

$ 418.99 USD

Limited Qty Sale

Add to Wish List

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

2X Entries Into Our F80 M3 Sweepstakes

T#:340541

Part#: 17111742231

Ships in 7 Business Days

$ 17.99 USD

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Qty

$ 17.99 USD

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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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Coolant Expansion Tank With Cap - 17111712835

2X Entries Into Our F80 M3 Sweepstakes

T#:46616014

Part#: EPK0012

Back Ordered

$ 29.99 USD

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Qty

$ 29.99 USD

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The coolant expansion tank provides a place for excess fluid as coolant expands and contracts with temperature changes. Constant exposure to these extremes can cause the tank to crack, break, or suffer damage to its nipples or mounting points. To keep your cooling system sealed and functioning properly, any damaged tank should be replaced.

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

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

Coolant Expansion Tank

BMW Expansion Tank With Cap - 17107514964

Moroso Performance Aluminum Expansion Tank - E36, Z3

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

Coolant Expansion Tank With Cap - 17111712835

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