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Coolant Expansion Tank - E46 (non-M), X3, X5 3.0
Coolant Expansion Tank - E46 (non-M), X3, X5 3.0
10X Entries Into Our F80 M3 Sweepstakes
Packaged by Turner - Corporate Logo
T#:338020
Part#: 17117573781
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Sale - Save 12% $ 140.99

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

Starting at $ 123.98 USD
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Sale - Save 12%
$ 140.99

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

Starting at $ 123.98 USD
Free Shipping
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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OEM Coolant Expansion Tanks Kit - F22/23 F3X B48 B58
OEM Coolant Expansion Tanks Kit - F22/23 F3X B48 B58
10X Entries Into Our F80 M3 Sweepstakes
Packaged by Turner - Corporate Logo
T#:27605427
Part#: 17138677649TKT
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Sale - Save 3% $ 208.99

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

$ 202.62 USD
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Sale - Save 3%
$ 208.99

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

$ 202.62 USD
Free Shipping on orders $49 and up
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
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