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BMW Coolant Expansion Tanks for BMW X Series E53 (2000-2006)

Clear BMW chassis

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 - E46 (non-M), X3, X5 3.0

10X Entries Into Our F80 M3 Sweepstakes

T#:338020

Part#: 17117573781

In Stock at Vendor

Sale - Save 9% $ 140.99

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

Starting at $ 127.98 USD

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Sale - Save 9%

$ 140.99

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

Starting at $ 127.98 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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Automatic Transmission Thermostat Kit

10X Entries Into Our F80 M3 Sweepstakes

T#:57122955

Part#: 17111438819KT2

Ships on Dec 30, 2026

$ 93.66 USD

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$ 93.66 USD

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Keeping your E53 X5 automatic transmission cool is essential for longevity and peak performance. The factory transmission thermostat circuit relies on plastic housings and o-ring seals that deteriorate over time. When the transmission thermostat fails or it's mounting assembly cracks, coolant loss follows putting your transmission at risk of overheating under load.

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Coolant Expansion Tank - E53 E46 E83 M52 M54

2X Entries Into Our F80 M3 Sweepstakes

T#:373103

Part#: 17137787039

Ships in 1 Business Day

$ 45.99 USD

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$ 45.99 USD

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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.

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Coolant Expansion Tank

2X Entries Into Our F80 M3 Sweepstakes

T#:377303

Part#: 17107514964

Ships in 1 Business Day

$ 52.30 USD

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$ 52.30 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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Expansion Tank

2X Entries Into Our F80 M3 Sweepstakes

T#:362010

Part#: 17137501959

Ships in 1 Business Day

$ 53.99 USD

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$ 53.99 USD

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Includes vent screw and leveling switch

URO Expansion Tank Mount - BMW E53 M54 3.0L

For vehicles with automatic transmission

2X Entries Into Our F80 M3 Sweepstakes

T#:598530

Part#: 17111438819

Ships in 1 Business Day

$ 51.99 USD

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$ 51.99 USD

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Found on the left side of the radiator - ensures proper mounting of the radiator. Quality replacement from URO

Expansion Tank Mounting Plate

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T#:593026

Part#: 17101439110

Ships in 1 Business Day

$ 68.99 USD

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$ 68.99 USD

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

Expansion Tank Mounting Clamp

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T#:591954

Part#: 17111707777

Ships in 1 Business Day

$ 6.99 USD

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$ 6.99 USD

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

URO Expansion Tank Hose - E53

2X Entries Into Our F80 M3 Sweepstakes

T#:45278651

Part#: 11537500735

Back Ordered

$ 23.99 USD

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$ 23.99 USD

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A reliable, affordable solution for maintaining cooling system integrity and long-term engine health.

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