Search | Turner Motorsport

Turner Motorsport Aluminum Coolant Expansion Tank Relocation Kit - E9...

10X Entries Into Our F80 M3 Sweepstakes
Compatible with hotside and coldside (OE location) intakes

T#:568369

Part#: 021942TMS13

In Stock

Sale - Save 15% $ 815.99

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

$ 693.59 USD

Add to Wish List

Qty

Sale - Save 15%

$ 815.99

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

$ 693.59 USD

Add to Wish List

Hotside intakes are a very common modification for N54 powered BMWs. Here at Turner Motorsport, we found ourselves unsatisfied with all existing solutions to relocate the coolant expansion tank to the cold side of your engine bay, freeing up real estate on the hot side. We decided to make an end all be all solution for people looking to relocate your expansion tank that's compatible with both hotside intakes and factory location coldside intakes. All CAD designed in-house, our N54 aluminum expansion tank relocation kit allows you to seamlessly mount our new aluminum expansion tank on the cold side of your engine bay.

Turner Motorsport HD Aluminum Coolant Expansion Tank Kit - M50/M52/S5...

10X Entries Into Our F80 M3 Sweepstakes

T#:9998526

Part#: 008348LA01BKT

Ships on Oct 13, 2026

Sale - Save 20% $ 423.99

This product was last offered at the strikethrough price on
06-14-2026

$ 339.19 USD

Add to Wish List

Qty

Sale - Save 20%

$ 423.99

This product was last offered at the strikethrough price on
06-14-2026

$ 339.19 USD

Add to Wish List

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

Turner Motorsport Aluminum Coolant Expansion Tank Relocation Kit - E8...

10X Entries Into Our F80 M3 Sweepstakes
Compatible with hotside and coldside (OE location) intakes

T#:568368

Part#: 021942TMS14

In Stock

Sale - Save 13% $ 815.99

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

$ 708.04 USD

Add to Wish List

Qty

Sale - Save 13%

$ 815.99

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

$ 708.04 USD

Add to Wish List

Hotside intakes are a very common modification for N54 powered BMWs. Here at Turner Motorsport, we found ourselves unsatisfied with all existing solutions to relocate the coolant expansion tank to the cold side of your engine bay, freeing up real estate on the hot side. We decided to make an end all be all solution for people looking to relocate your expansion tank. All CAD designed in-house, our N54 aluminum expansion tank relocation kit allows you to seamlessly mount our new aluminum expansion tank on the cold side of your engine bay, featuring an integrated power steering pump reservoir mount. During the design process, we did everything possible to ensure no air pockets could develop in the cooling system even during spirited drives. The baffled tank is all TIG welded 5052 aluminum construction, featuring a carefully designed bleed passage. We also machined all of our bungs to accept OEM hose ends, to keep the fit and finish as OE+ as possible. Keeping with this same mindset, we made sure that coolant elevation matches OE exactly, and integrated a power steering pump reservoir mount. Our aluminum expansion tank accepts the OE coolant level sensor, bleeder screw, and coolant cap, but we include new ones with this kit, as we thought you should replace them during installation. See more about these features in the list below, and if you have any additional questions please feel free to call into our staff of skilled BMW enthusiasts at 1-800-280-6966. Find our Installation Guide HERE Features and benefits: TIG welded 5052 aluminum construction, wrinkle black powder coated Utilizes factory coolant capacity and expansion volume CAD designed to retain OE coolant elevation, which prevents air pockets Baffled tank ensures that air pockets will not be created under spirited driving conditions, and ensures accurate coolant level reading Meticulously designed bleed passage prevents air pockets while the engine cools All bungs machined for factory hose end compatibility (no barb fittings!) Integrated power steering reservoir mount Kit includes Turner Motorsport aluminum expansion tank, Turner Motorsport wiring harness, all necessary hoses, hardware, OE level sensor, bleeder screw, and coolant cap This product fits the following BMWs: 2008-2013 E82 135i 2007-2013 E88 135i

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

10X Entries Into Our F80 M3 Sweepstakes

T#:338020

Part#: 17117573781

Ships in 1 Business Day

Sale - Save 12% $ 140.99

This product was last offered at the strikethrough price on
04-01-2026

Starting at $ 123.98 USD

Add to Wish List

Sale - Save 12%

$ 140.99

This product was last offered at the strikethrough price on
04-01-2026

Starting at $ 123.98 USD

Add to Wish List

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

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

10X Entries Into Our F80 M3 Sweepstakes

T#:338018

Part#: 17111723520

Ships in 3 Business Days

Starting at $ 99.99 USD

Add to Wish List

Starting at $ 99.99 USD

Add to Wish List

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)

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

10X Entries Into Our F80 M3 Sweepstakes

T#:27605427

Part#: 17138677649TKT

Ships in 3 Business Days

Sale - Save 3% $ 208.99

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

$ 202.62 USD

Add to Wish List

Qty

Sale - Save 3%

$ 208.99

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

$ 202.62 USD

Add to Wish List

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

Silicone Expansion Tank Relocation Heater Hose

10X Entries Into Our F80 M3 Sweepstakes

T#:21735881

Part#: 053082LA01

In Stock

Sale - Save 25% $ 75.99

This product was last offered at the strikethrough price on
06-14-2026

$ 56.99 USD

Add to Wish List

Qty

Sale - Save 25%

$ 75.99

This product was last offered at the strikethrough price on
06-14-2026

$ 56.99 USD

Add to Wish List

Upgraded or replacement silicone heater hose for our N54 expansion tank relocation kits.

60" silicone performance coolant hose featuring a molded 90-degree bend for installs with space constraints.

Features and benefits:

Constructed of 4-Ply reinforced silicone for improved durability over the failure-prone rubber hoses.
Reduced thermal conductivity
Improved resistance to ozone and UV degradation for improved performance and durability.
Turner branded

Project Cars

SELECT YOUR BMW

Showing 7 results for "coolant expansion tank"

Turner Motorsport Aluminum Coolant Expansion Tank Relocation Kit - E9...

Turner Motorsport HD Aluminum Coolant Expansion Tank Kit - M50/M52/S5...

Turner Motorsport Aluminum Coolant Expansion Tank Relocation Kit - E8...

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

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

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

Silicone Expansion Tank Relocation Heater Hose

Select Vehicle

Purpose

Category

Brand

Price

Special Offers

Shipping

Narrow Results