BMW Coolant Expansion Tanks

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

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T#:338020

Part#: 17117573781

In Stock

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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Sale - Save 10%

$ 137.99

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

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

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

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T#:338018

Part#: 17111723520

Ships in 1 Business Day

$ 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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Expansion Tank Replacement Kit - E60 M5,E63 M6

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T#:584232

Part#: 17112283345KT

In Stock

$ 250.99 USD

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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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Blackline Performance Coolant Expansion Tank Cap Cover - BMW M - Red ...

T#:641289

Part#: FXXCET-R

In Stock

$ 65.00 USD

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$ 65.00 USD

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Give the plain plastic factory coolant caps an upgrade with the brand new BLACKLINE Performance Coolant Expansion Tank Cap Cover from Goldenwrench. Each cap is CNC formed from T6 Aluminum and anodized in a limited release race inspired red color. All logos and decorations are finalized through a precision 3D milling process, machined into each cap for the ultimate premium finish. The BLACKLINE Performance Billet Coolant Expansion Tank Cap Cover will fit most BMW vehicles equipped with the N55, S55, S63, and S65 engine with the large coolant tank found in the following vehicles E90/E91/E92 M3 LCI, F22 M235i, F87 M2/M2 Competition, F80 M3, F82 M4, F10/F90 M5, and more (check your coolant cap ensuring that it is the same shape as seen in the product photos). Each kit comes with a Billet Coolant Expansion Tank Cap Cover, and an Installation Instruction Card. This is a not a full cap replacement. The Billet Cap Cover affixes to the top of your factory coolant cap installing easily in minutes.

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Blackline Performance Coolant Expansion Tank Cap Cover - BMW M - Blue...

T#:5691129

Part#: FXXCET-B

In Stock

$ 65.00 USD

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$ 65.00 USD

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Give the plain plastic factory coolant caps an upgrade with the brand new BLACKLINE Performance Coolant Expansion Tank Cap Cover from Goldenwrench. Each cap is CNC formed from T6 Aluminum and anodized in a limited release race inspired blue color. All logos and decorations are finalized through a precision 3D milling process, machined into each cap for the ultimate premium finish. The BLACKLINE Performance Billet Coolant Expansion Tank Cap Cover will fit most BMW vehicles equipped with the N55, S55, S63, and S65 engine with the large coolant tank found in a variety of M vehicles(check your coolant cap ensuring that it is the same shape as seen in the product photos). Each kit comes with a Billet Coolant Expansion Tank Cap Cover, and an Installation Instruction Card. This is a not a full cap replacement. The Billet Cap Cover affixes to the top of your factory coolant cap installing easily in minutes.

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N54 Billet 90 Degree Coolant Tank Fitting

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T#:12184492

Part#: VTT-COOLANT-90-1

In Stock

$ 37.99 USD

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$ 37.99 USD

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Enhance the flexibility of your BMW's coolant system with the Vargas Turbo Technologies 90-Degree Coolant Tank Fitting. Ideal for applications such as single turbo setups or forward-facing intake manifolds, this fitting provides extra clearance and versatile hose routing options.

Key Benefits:

Allows hose to run straight down, increasing clearance
Made of durable 6061-T6 aluminum for long-lasting performance
Anodized black finish for enhanced durability and corrosion resistance
Includes fitting and clamp for easy installation

Upgrade your BMW's coolant system with the Vargas Turbo Technologies 90-Degree Coolant Tank Fitting for improved performance and versatility.

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VTT Billet Coolant Reservoir Cap - Anodized Blue - Most BMWs 2006+ (E...

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T#:7530036

Part#: COOLANTCAPBLUE

In Stock

$ 79.99 USD

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$ 79.99 USD

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VTT is proud to offer their billet replacement for the factory plastic Coolant Reservoir cap. This cap does away with the weak plastic cap while adding some pop, and color to your engine bay. This coolant cap retains ALL of the factory provisions by simply allowing you to snap the factory pressure-relief into the new Billet Cap. VTT also designed these caps to complement their N5X Billet Oil caps, N5XBillet Oil filter housing caps, and Billet Power Steering cap, so all 4 will have the same design. These caps are offered in 4 colors – Red, Black, Blue, and Clear anodized Replaces Genuine BMW Reservoir Cap # 17117639020 Note: Fitment includes 99% of all BMW with a coolant Reservoir tank from the E series forward, meaning then fit even the brand New G8X M3/4 with the S58, all B58, etc. If your BMW is an E90 or newer this cap most likely will fit

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VTT Billet Coolant Reservoir Cap - Anodized Red - Most BMWs 2006+ (E/...

2X Entries Into Our F80 M3 Sweepstakes

T#:7530034

Part#: COOLANTCAPRED

In Stock

$ 79.99 USD

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Qty

$ 79.99 USD

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VTT is proud to offer their billet replacement for the factory plastic Coolant Reservoir cap. This cap does away with the weak plastic cap while adding some pop, and color to your engine bay. This coolant cap retains ALL of the factory provisions by simply allowing you to snap the factory pressure-relief into the new Billet Cap. VTT also designed these caps to complement their N5X Billet Oil caps, N5XBillet Oil filter housing caps, and Billet Power Steering cap, so all 4 will have the same design. These caps are offered in 4 colors – Red, Black, Blue, and Clear anodized Replaces Genuine BMW Reservoir Cap # 17117639020 Note: Fitment includes 99% of all BMW with a coolant Reservoir tank from the E series forward, meaning then fit even the brand New G8X M3/4 with the S58, all B58, etc. If your BMW is an E90 or newer this cap most likely will fit

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BMW E9X Z4 E8X Coolant Expansion Tank

2X Entries Into Our F80 M3 Sweepstakes

T#:402142

Part#: 17137640514

In Stock

$ 70.99

This product was last offered at the strikethrough price on
06-22-2026

$ 70.35 USD

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$ 70.35 USD

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Includes level sensor

Blackline Performance Coolant Expansion Tank Cap Cover - Gray - BMW M...

T#:641288

Part#: FXXCET

In Stock

$ 65.00 USD

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Qty

$ 65.00 USD

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Give the plain plastic factory coolant caps an upgrade with the brand new BLACKLINE Performance Coolant Expansion Tank Cap Cover from Goldenwrench. Each cap is CNC formed from T6 Aluminum and anodized with an Anthracite Gray color to compliment the factory engine cover. All logos and decorations are finalized through a precision 3D milling process, machined into each cap for the ultimate premium finish. The BLACKLINE Performance Billet Coolant Expansion Tank Cap Cover will fit most BMW vehicles equipped with the N55, S55, S63, and S65 engine with the large coolant tank found in the following vehicles E90/E91/E92 M3 LCI, F22 M235i, F87 M2/M2 Competition, F80 M3, F82 M4, F10/F90 M5, and more (check your coolant cap ensuring that it is the same shape as seen in the product photos). Each kit comes with a Billet Coolant Expansion Tank Cap Cover, and an Installation Instruction Card. This is a not a full cap replacement. The Billet Cap Cover affixes to the top of your factory coolant cap installing easily in minutes.

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Coolant Expansion Tank

2X Entries Into Our F80 M3 Sweepstakes

T#:592020

Part#: 17137640515

In Stock

$ 97.99 USD

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$ 97.99 USD

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Includes level sensor

Rein Coolant Expansion Tank - E46, E53, E83

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T#:402141

Part#: 17117573781

In Stock

$ 76.39 USD

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$ 76.39 USD

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Includes cap and level sensor

VTT Billet Coolant Reservoir Cap - Anodized Clear - Most BMWs 2006+ (...

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T#:7530035

Part#: COOLANTCAPRAW

Ships in 3 Business Days

$ 78.99 USD

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Qty

$ 78.99 USD

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VTT is proud to offer their billet replacement for the factory plastic Coolant Reservoir cap. This cap does away with the weak plastic cap while adding some pop, and color to your engine bay. This coolant cap retains ALL of the factory provisions by simply allowing you to snap the factory pressure-relief into the new Billet Cap. VTT also designed these caps to complement their N5X Billet Oil caps, N5XBillet Oil filter housing caps, and Billet Power Steering cap, so all 4 will have the same design. These caps are offered in 4 colors – Red, Black, Blue, and Clear anodized Replaces Genuine BMW Reservoir Cap # 17117639020 Note: Fitment includes 99% of all BMW with a coolant Reservoir tank from the E series forward, meaning then fit even the brand New G8X M3/4 with the S58, all B58, etc. If your BMW is an E90 or newer this cap most likely will fit

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

2X Entries Into Our F80 M3 Sweepstakes

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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$ 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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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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$ 54.59 USD

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

Coolant Expansion Tank

2X Entries Into Our F80 M3 Sweepstakes

T#:388723

Part#: 17137823626

In Stock

$ 78.99

This product was last offered at the strikethrough price on
10-15-2026

$ 47.59 USD

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$ 47.59 USD

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Mounts towards the front of the engine bay

Expansion Tank Mounting Plate

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T#:402140

Part#: 17111436250

In Stock

$ 70.99

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

$ 58.29 USD

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$ 58.29 USD

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BMW E39 Coolant Expansion Tank

2X Entries Into Our F80 M3 Sweepstakes

T#:388645

Part#: 17111436381

In Stock at Vendor

$ 87.99 USD

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$ 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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Febi Expansion Tank Mounting Plate - E83

We Price Match - Give Us A Call or Chat!

T#:1196172

Part#: 17113400017

Ships in 1 Business Day

$ 95.99

This product was last offered at the strikethrough price on
05-07-2026

$ 92.99 USD

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$ 92.99 USD

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Secures the expansion tank to the radiator

Rein Expansion Tank Mounting Plate - E83

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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

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

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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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$ 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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$ 58.95 USD

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Includes bleeder screw

OEM Rein Expansion Tank - E90 335d

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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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Qty

$ 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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$ 68.39 USD

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Replace your cracked or faded tank

VTT Billet Coolant Reservoir Cap - Anodized Black - Most BMWs 2006+ (...

2X Entries Into Our F80 M3 Sweepstakes

T#:7530033

Part#: COOLANTCAPBLK

Ships in 10 Business Days

$ 79.99 USD

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Qty

$ 79.99 USD

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VTT is proud to offer their billet replacement for the factory plastic Coolant Reservoir cap. This cap does away with the weak plastic cap while adding some pop, and color to your engine bay. This coolant cap retains ALL of the factory provisions by simply allowing you to snap the factory pressure-relief into the new Billet Cap. VTT also designed these caps to complement their N5X Billet Oil caps, N5XBillet Oil filter housing caps, and Billet Power Steering cap, so all 4 will have the same design. These caps are offered in 4 colors – Red, Black, Blue, and Clear anodized Replaces Genuine BMW Reservoir Cap # 17117639020 Note: Fitment includes 99% of all BMW with a coolant Reservoir tank from the E series forward, meaning then fit even the brand New G8X M3/4 with the S58, all B58, etc. If your BMW is an E90 or newer this cap most likely will fit

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