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.

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, Genuine BMW - E30 325i 88+ & E36 M3 Euro

Replacement for your aged or damaged expansion tank

Price: $121.59
134.73

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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 - 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 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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Genuine BMW Coolant Expansion Tank for E30 M3 '88-'91 - 17112225543

Replacement for your aged or damaged expansion tank

Price: $191.59
201.67

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Coolant Expansion Tank, Behr - E46, E83 X3, E53 X5 3.0

OEM replacement for your aged or damaged coolant reservoir

Price: $50.99
127.36

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E46 M3 Aluminum Expansion Tank by Moroso

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

Price: $392.99
462.34

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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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E36 Aluminum Expansion Tank by Moroso

Factory-style replacement aluminum coolant expansion tank for all 6-cylinder E36 models

Price: $402.99
474.11

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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: $7.99
8.73

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Expansion Tank Cap - 17132754264

Aftermarket Replacement # 17 13 2 754 264, 24 Month Warranty

Price: $6.05
8.28

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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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Expansion Tank Cap - 17111468077

Aftermarket Replacement # 17 11 1 468 077, 24 Month Warranty

Price: $3.28
4.43

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Expansion Tank Cap - 17114379047

Aftermarket replacement cap coolant reservoir on E28 828e, E24 633CSi, and early E30 325e/i models.

Price: $7.99
28.93

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Expansion Tank - URO - 17111741167

Aftermarket Replacement to BMW # 17111741167 with a 24 Month Warranty

Price: $31.34
37.65

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Expansion Tank - 17111712835 - E36 / Z3 4-Cylinder and E34 525i

Aftermarket Replacement # 17 11 1 712 835, 24 Month Warranty

Price: $27.30
36.30

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Expansion Tank - 17107514964

Aftermarket Replacement # 17 10 7 514 964, 24 Month Warranty

Price: $46.90
64.18

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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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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: $183.99
218.41

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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: $138.87
161.86

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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: $152.06
154.80

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17 11 1 742 232 Radiator Cap 1.4 Bar Small.JPG

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: $115.07
127.50

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

Stock replacement coolant tank for original cooling performance

Price: $241.91
254.64

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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-E46-AT-wp-tn.jpg

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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BMW-E46-325i-325ci-330i-330ci-328i-323i-non-M-Aluminum-Expansion-Tank-Moroso-27483-1-sm.jpg

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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Expansion Tank Mounting Bracket - E46 E85 Z4 with Auto Trans

Expansion tank frame for automatic transmission models. Replaces BMW part # 17111436251.

Price: $99.01
104.23

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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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Expansion Tanks

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

Price: $120.81 127.17

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

Price: $152.11 160.12

Coolant Expansion Tank, Genuine BMW - E30 325i 88+ & E36 M3 Euro

Price: $121.59 134.73

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

Price: $24.99 102.47

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

Price: $64.79 140.00

Coolant Expansion Tank Cap - E36, E46, E34, E39, E38, X3, X5, Z3, Z4

Price: $6.64 9.09

Genuine BMW Coolant Expansion Tank for E30 M3 '88-'91 - 17112225543

Price: $191.59 201.67

Coolant Expansion Tank, Behr - E46, E83 X3, E53 X5 3.0

Price: $50.99 127.36

E46 M3 Aluminum Expansion Tank by Moroso

Price: $392.99 462.34

Coolant Expansion Tank - 17 13 7 552 546 - URO

Price: $47.49 140.86

E36 Aluminum Expansion Tank by Moroso

Price: $402.99 474.11

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

Price: $7.99 8.73

Expansion Tank Cap - 17132754264

Price: $6.05 8.28

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

Price: $10.99 13.00

Expansion Tank Cap - 17111468077

Price: $3.28 4.43

Expansion Tank Cap - 17114379047

Price: $7.99 28.93

Expansion Tank - URO - 17111741167

Price: $31.34 37.65

Expansion Tank - 17111712835 - E36 / Z3 4-Cylinder and E34 525i

Price: $27.30 36.30

Expansion Tank - 17107514964

Price: $46.90 64.18

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

Price: $33.56 43.19

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

Price: $51.49 143.93

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

Price: $44.99 76.93

Expansion Tank Retaining Plate - E46 / Z4 - 17111436251

Price: $38.90 50.69

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

Price: $51.99 112.72

Genuine BMW Coolant Expansion Tank - E46 M3

Price: $183.99 218.41

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

Price: $138.87 161.86

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

Price: $79.19 146.44

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

Price: $152.06 154.80

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

Price: $7.49 27.29

Expansion Tank Mounting Bracket - E46 - Manual Trans

Price: $115.07 127.50

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

Price: $241.91 254.64

Coolant Expansion Tank - E39 M5 (2000-2003)

Price: $307.02 323.18

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

Price: $64.99 104.81

Coolant Expansion Tank Overhaul Package - E46 Manual

Price: $109.99 119.95

Coolant Expansion Tank Overhaul Package, OEM - E46 Automatic

Price: $138.99 347.88

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

Price: $339.99 382.93

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

Price: $40.99 49.68

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

Price: $49.99 95.24

Expansion Tank Mounting Bracket - E46 E85 Z4 with Auto Trans

Price: $99.01 104.23

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

Price: $120.81
127.17

Price: $152.11
160.12

Price: $121.59
134.73

Price: $24.99
102.47

Price: $64.79
140.00

Price: $6.64
9.09

Price: $191.59
201.67

Price: $50.99
127.36

Price: $392.99
462.34

Price: $47.49
140.86

Price: $402.99
474.11

Price: $7.99
8.73

Price: $6.05
8.28

Price: $10.99
13.00

Price: $3.28
4.43

Price: $7.99
28.93

Price: $31.34
37.65

Price: $27.30
36.30

Price: $46.90
64.18

Price: $33.56
43.19

Price: $51.49
143.93

Price: $44.99
76.93

Price: $38.90
50.69

Price: $51.99
112.72

Price: $183.99
218.41

Price: $138.87
161.86

Price: $79.19
146.44

Price: $152.06
154.80

Price: $7.49
27.29

Price: $115.07
127.50

Price: $241.91
254.64

Price: $307.02
323.18

Price: $64.99
104.81

Price: $109.99
119.95

Price: $138.99
347.88

Price: $339.99
382.93

Price: $40.99
49.68

Price: $49.99
95.24

Price: $99.01
104.23

Price: $11.24
21.36