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Expansion Tanks

A BMW expansion tank ensures that your radiator is always full, even when cold, and provides a way for hot fluid to expand without releasing fluid on the road below you. Factory BMW tanks are made of plastic, and will eventually crack, leak and fail. BMW expansion tanks should be inspected during routine maintenance. We recommend replacing the expansion tank as a preventatively whenever you replace the radiator and coolant hoses. We also offer high-quality aluminum replacement tanks for some BMWs. Use our SEARCH BY MODEL feature to filter these items for your BMW.

Want to learn more about your BMW's cooling system? Check out our BMW cooling system tech page by clicking here.

Need help finding Expansion Tanks for your BMW? Call us at 877.639.9648, email us, or live chat for expert assistance.

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Febi-Bilstein Coolant Expansion Tank - E85 E86 Z4 2.5i 3.0i 3.0si

Quality aftermarket antifreeze coolant reservoir for Z4 coupe and roadster models with the M54 or N52 engine (2003-2008).

Price: $51.49

143.93
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Expansion Tank Retaining Plate - E53 X5 3.0i Automatic (2001-2006)

Expansion tank frame for automatic transmission models. Replaces BMW part #17111438819

Price: $44.99

76.93
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Expansion Tank Retaining Plate - E46 / Z4 - 17111436251

Aftermarket Replacement # 17111436251 with a 24 Month Warranty

Price: $38.90

50.69
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Coolant Expansion Tank, Rein - E39 525i 528i 530i 1999-2003

Replacement coolant reservoir identical to the original BMW part #17111436381

Price: $51.99

112.72
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Genuine BMW Coolant Expansion Tank - E46 M3

This is the authentic Genuine BMW expansion tank for the E46 M3 cooling system, part # 17112283344

Price: $153.99

189.86
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Expansion Tank, BMW - E53 X5 4.4/4.8is N62

Replacement coolant reservoir identical to the original BMW part #17137501959

Price: $99.99

158.22
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Coolant Expansion Tank - OEM - E60/E61 5 Series, E63/E64 6 Series

OEM Replacement Coolant Expansion Tank For Most E60, E61 5-Series and E63/E64 6-Series

Price: $79.19

146.44
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Coolant Expansion Tank, BMW - E82 128i/135i, E9X 325i/328i/330i/335i, E89 Z4

Factory replacement coolant tank for original cooling performance

Price: $147.06

154.80
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Radiator Cap 1.4 Bar - E30 325e/325i & E34 525i M20 - 17111742232

This is a simple and budget-friendly replacement radiator cap made by a quality aftermarket manufacturer.

Price: $7.49

27.29
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Expansion Tank Mounting Bracket - E46 - Manual Trans

Expansion tank frame for manual transmission models. Replaces BMW part #17111436250.

Price: $113.93

126.24
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Genuine BMW Coolant Expansion Tank Reservoir - E9X M3 (S65)

Stock replacement coolant tank for original cooling performance

Price: $194.97

235.55
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Coolant Expansion Tank - E39 M5 (2000-2003)

Original BMW plastic antifreeze reservior with level sensor

Price: $307.02

323.18
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Coolant Expansion Tank, Rein - E46 (non-M), X3, X5 3.0 (17117573781)

OEM tank replaces BMW part #17117573781

Price: $64.99

104.81
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Coolant Expansion Tank Overhaul Package - E46 Manual

Resolve a leaking E46 expansion tank with one package

Price: $109.99

119.95
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Coolant Expansion Tank Overhaul Package, OEM - E46 Automatic

Resolve a leaking E46 expansion tank with one package using an OEM tank

Price: $138.99

347.88
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E46 323i/325i/328i/330i Aluminum Expansion Tank by Moroso

Prevent catastrophy by replacing your aged, fragile plastic tank with a high-quality, long-lasting aluminum tank

Price: $339.99

382.93
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Coolant Expansion Tank, Behr - E36, E39, Z3, MZ3, M50, M52, S52

OEM replacement for your aged or damaged expansion tank

Price: $40.99

49.68
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Auto Transmission Cooler Thermostat, Behr - E46, E83 X3, E53 X5, E85/E86 Z4

OEM thermostat to regulate transmission cooler. Replaces BMW part #17111437362.

Price: $49.99

95.24
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