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

Prevent catastrophe by replacing your aged, fragile N51/N52/N54 plastic tank with a high-quality, long-lasting aluminum tank

Price: $386.99

455.28
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Aluminum Coolant Expansion Tank Reservoir - E9X M3

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

Price: $463.99

545.87
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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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Auto Transmission Cooler Thermostat, Rein - E46, E83 X3, E53 X5, E85/E86 Z4

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

Price: $24.90

101.55
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BMW Expansion Tank - 34321112399 - E10

High quality, 24 Month Warranty

Price: $29.99

98.41
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Bracket for Coolant Expansion Tank, BMW - E85/E86 Z4 Manual

Original BMW mounting bracket attaches the coolant reservoir to the radiator.

Price: $75.69

89.56
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Bracket for Coolant Expansion Tank, URO - E85/E86 Z4 Manual

Quality aftermarket mounting bracket attaches the coolant reservoir to the radiator.

Price: $57.99

89.56
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Brass Radiator Bleeder Screw - Most BMWs

Never break your BMW bleeder screw again!

Price: $3.79

5.19
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Cap for Coolant Expansion Tank, BMW - G42 G20 G22 G26 G29

Original BMW cam for the main coolant reservoir on G42 2-series, G20 3-series, G22/G23/G26 4-series, and G29 Z4 models.

Price: $21.59

23.98
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Charge Air Cooler Coolant Reservoir & Hoses, BMW - F8X M3/M4

Stock replacement small coolant tank with hoses. Genuine replacement for BMW part #17132284601.

Price: $239.99

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Charge Air Cooler Coolant Reservoir, BMW - F8X M3/M4

Stock replacement small coolant tank for original cooling performance. Genuine replacement for BMW part #17132284601.

Price: $119.74

132.67
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Charge Air Cooler Expansion Tank, BMW - X3/X3M, X4/X4M, X5/X5M, X6/X6M, X7, XM

Coolant reservoir tank dedicated to the intake charge air cooler system

Price: $132.34

139.30
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Charge Air Cooler Reservoir - F22 230i/M240i, F30 330i/340i, F32 430i/440i, B46, B58

Replacement for your aged or damaged expansion tank

Price: $78.99

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Charge Air Cooler Reservoir Cap - Many 2015+ Models

Keep optimum cooling performance - replace your cap every three years! Replacement for BMW part #17117639024

Price: $7.99

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Charge Air Cooler Reservoir Cap, BMW - Many 2015+ Models

Keep optimum cooling performance - replace your cap every three years! Genuine replacement for BMW part #17117639024

Price: $15.42

16.23
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Charge Air Cooler Reservoir, BMW - F22 230i/M240i, F30 330i/340i, F32 430i/440i, B46, B58

Genuine replacement for your aged or damaged expansion tank

Price: $119.74

132.67
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Coolant Expansion Tank - 17 13 7 552 546 - URO

Aftermarket Expansion Tank With Level Sensor

Price: $47.49

140.86
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Coolant Expansion Tank - E12 528i & 530i (1977-1981)

Genuine BMW Part Number 17111114743 / 17-11-1-114-743

Price: $135.24

142.36
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Coolant Expansion Tank - E24 633CSi 635CSi (1983-1989)

Original BMW coolant reservoir for E24 6-Series

Price: $101.25

112.19
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Coolant Expansion Tank - E28 533i 535i (1983-1988)

Original BMW Coolant Reservoir For E28 5-Series withe M30 engine

Price: $134.09

141.15
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Coolant Expansion Tank - E30 / E36 / Z3 4 cylinder, E34 525i - 17111712835

Replacement for your aged or damaged expansion tank

Price: $24.99

102.47
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Coolant Expansion Tank - E30 325e 325i & E28 528e (1982-1988)

Original BMW replacement for your aged or damaged expansion tank.

Price: $120.81

127.17
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Coolant Expansion Tank - E32 735i (1988-1994)

Replacement for your aged or damaged expansion tank.

Price: $152.11

160.12
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Coolant Expansion Tank - E32 735i Sedan (1988-1994)

Quality aftermarket coolant overflow reservoir for E32 735i sedan models.

Price: $33.56

43.19
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Coolant Expansion Tank - E34 530i 540i - E32 740i 740il 750il

Genuine BMW # 17111719110

Price: $140.29

147.67
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Coolant Expansion Tank - E34 M5

Genuine BMW # 17112227091

Price: $164.46

173.12
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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 - E60 M5,E63 M6

Genuine BMW # 17112283345

Price: $188.33

198.24
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Coolant Expansion Tank - E85 E86 Z4 M Coupe/Roadster (2006-2008)

Original BMW coolant reservoir for all E85/E86 Z4 M (S54 Engine).

Price: $160.17

168.60
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Coolant Expansion Tank - F10 528i 528ix N20 4-Cylinder (2012-2016)

Original BMW coolant reservoir for F10 528i sedan with the 4-cylinder N20 engine.

Price: $155.61

163.80
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Coolant Expansion Tank - F48 X1, F39 X2 28i, MINI F56/F60

OEM-type Expansion Tank for engine coolant on 4-cylinder X1 and X2 models.

Price: $65.99

101.88
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Coolant Expansion Tank - OEM - E31 E38 E39 V8 & V12 - 17111741167

OE Replacement for your aged or damaged expansion tank

Price: $64.79

140.00
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Coolant Expansion Tank - OEM - E60/E61 5 Series, E63/E64 6 Series

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

Price: $120.73

139.17
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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 Cap - E36, E46, E34, E39, E38, X3, X5, Z3, Z4

Keep optimum cooling performance - replace your cap every three years! Aftermarket replacement for BMW part #17117639022.

Price: $6.64

9.09
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Coolant Expansion Tank Cap, Aftermarket - E82, F22, E9X, F3X, F10, F13, G30, F01, F02, F25, F26, G01, G02, E70, F15, G05, E71, F16, G06

Keep optimum cooling performance - replace your cap every three years! Direct replacement for BMW part #17117639020.

Price: $10.99

13.00
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Coolant Expansion Tank Cap, Aftermarket - E9X M3, E60 E63 F01 E70 E71

Keep optimum cooling performance - replace your cap every three years! High quality replacement for BMW part #17137516004

Price: $6.64

8.73
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Coolant Expansion Tank Cap, BMW - E82, F22, E9X, F3X, F10, F13, G30, F01, F02, F25, F26, G01, G02, E70, F15, G05, E71, F16, G06

Keep optimum cooling performance - replace your cap every three years! Original BMW part # 17117639020.

Price: $19.62

27.96
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Coolant Expansion Tank Cap, BMW - G26 i4 e40/M50

Replacement pressure-regulating cap for the cooling system

Price: $22.58

27.96
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Coolant Expansion Tank Cap, OEM - E36, E46, E39, E38, X3, X5, Z3, Z4

Keep optimum cooling performance - replace your cap every three years! OEM replacement for BMW part #17117639022.

Price: $11.24

21.36
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