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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.

Coolant Level Sensor O-Ring, CRP - E36 323i/325i/328i/M3, E34 525i, E39 528i/540i

O-ring to seal the level sensor in the expansion tank. OEM-type replacement for BMW part #61311361249.

Price: $0.99

9.70
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Expansion Tank/Coolant Bleeder Screw

Replace a stripped or broken radiator bleed screw. OEM-type replacement for BMW part #17111712788.

Price: $1.99

5.45
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Expansion Tank Cap - 17111468077

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

Price: $3.34

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Expansion Tank Cap - 17114379047

Aftermarket Replacement # 17 11 4 379 047, 24 Month Warranty

Price: $4.09

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Cooling System Plug, Rein - E60, F10, E63, F06/F13, F02

Blind plug used in a variety of places. OEM-type replacement for BMW part #11531436850.

Price: $4.99

8.25
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Genuine BMW Isolator Grommet / Bump Stop - 13717542860

Genuine BMW # 13717542860

Price: $5.95

6.00
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Expansion Tank Cap - 17132754264

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

Price: $6.37

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Expansion Tank Cap - 17137516004

Aftermarket Replacement # 17 13 7 516 004, 24 Month Warranty

Price: $6.99

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Cooling System Plug, Rein - F3X, E60, F10, G30, E63, F06/F12/F13, F02, X5/X6

Blind plug used in a variety of places. OEM-type replacement for BMW part 11531439134.

Price: $6.99

11.33
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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: $6.99

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Expansion Tank Cap - 17117521071

Aftermarket Replacement # 17 11 7 521 071, 24 Month Warranty

Price: $9.11

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

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

Price: $9.99

21.36
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Expansion Tank Retaining Clip - 17111707777

Expansion Tank Clamp - 17111707777

Price: $9.99

10.08
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Expansion Tank Cap, CRP - E23 735i

Keep optimum cooling performance - replace your cap every three years!

Price: $10.99

21.89
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Radiator Cap - 17117639022 - Rein

High quality, 24 Month Warranty

Price: $11.48

21.36
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Radiator Cap 1.4 Bar - 17 11 1 742 232

Radiator Cap 1.4 Bar - 17 11 1 742 232

Price: $12.99

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

Keep optimum cooling performance - replace your cap every three years! OEM-type replacement for BMW part #17117639021.

Price: $16.71

21.36
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Coolant Expansion Tank Cap - E90 E92 F30 F32 F10 F12 F06 - 17117639020

High quality replacement coolant cap with a 24 Month Warranty

Price: $16.71

18.97
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Coolant/Washer Level Sensor (installs in expansion tank) - Many BMW (see list)

High Quality Replacement to BMW # 17137553919

Price: $17.36

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Expansion Tank Cap, Genuine BMW - E30 M3, E28 M5

Keep optimum cooling performance - replace your cap every three years! Genuine replacement for BMW part #17112227683

Price: $17.59

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Small Coolant Reservoir Cap, BMW - Many 2015+ Models

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

Price: $18.23

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Expansion Tank, Rein - E36 318i/318ti, E34 525i, Z3 1.9

Replacement coolant reservoir identical to the original BMW part #17111712835

Price: $18.99

96.62
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Coolant Expansion Tank - E30 / E36 / Z3 4 cylinder, E34 525i - 17111712835

Replacement for your aged or damaged expansion tank

Price: $23.99

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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: $27.92

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Expansion Tank, Rein - E36 323i/325i/328i/M3, E39 528i, Z3 2.8, MZ3 S52

Replacement coolant reservoir identical to the original BMW part #17111723520

Price: $29.99

128.10
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Coolant Expansion Tank, Febi - E36, E39, Z3 (17111723520)

Replacement for your aged or damaged expansion tank

Price: $29.99

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Expansion Tank - URO - 17111741167

Aftermarket Replacement to BMW # 17111741167 with a 24 Month Warranty

Price: $32.99

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Expansion Tank - 17111712196

Aftermarket Replacement # 17 11 1 712 196, 24 Month Warranty

Price: $33.22

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Expansion Tank Retaining Plate - 17111438819

Aftermarket Replacement # 17 11 1 438 819, 24 Month Warranty

Price: $34.00

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Intercooler Vent Hose, Bank 1, BMW - F10 550i, F13 650i, F02 750i

Hose from intercooler on Bank 1 to reservoir. Genuine replacement for BMW part #17127589442. N63A, N63TU.

Price: $34.05

41.62
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Expansion Tank Retaining Plate - E46 / Z4 - 17111436251

Aftermarket Replacement # 17 11 1 436 251, 24 Month Warranty

Price: $38.99

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Coolant Expansion Tank, Behr - E36, E39, Z3 (17111723520)

OEM replacement for your aged or damaged expansion tank

Price: $38.99

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Intercooler Reservoir Hose, Bank 1, BMW - F10 550i, F13 650i, F02 750i

Hose from reservoir to intercooler on Bank 1. Genuine replacement for BMW part #17127575432. N63A, N63TU.

Price: $40.26

49.18
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Intercooler Reservoir Hose, Bank 2, BMW - F10 550i, F13 650i, F02 750i (N63)

Hose from intercooler to reservoir on Bank 2. Genuine replacement for BMW part #17127584405. N63A.

Price: $40.26

49.18
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Expansion Tank Vent Hose - E60 550i, E63 650i

Genuine BMW # 17127534917

Price: $44.52

57.93
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Coolant Expansion Tank - 17 13 7 552 546 - URO

Aftermarket Expansion Tank With Level Sensor

Price: $44.99

140.86
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Coolant Expansion Tank - E46 (non-M) X3 X5 3.0 - 17117573781

OEM Replacement For Your Aged Or Damaged Expansion Tank

Price: $46.99

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Expansion Tank Mounting Bracket, Rein - E46 Manual Trans

Expansion tank frame makes replacement a breeze!

Price: $47.99

74.02
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Coolant Expansion Tank - E39 525i 528i 530i 1999-2003

High Quality Replacement to BMW # 17111436381

Price: $48.40

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Expansion Tank, OEM - F10 535d, F02 730LdX

Stock replacement coolant tank for original cooling performance

Price: $48.99

135.44
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What customers are saying...

  • I am extremely pleased with this order. The price was competitive and your expedited delivery charge was surprisingly low. I needed the part fast and you exceeded my expectations. I especially appreciate your gentleman who over the phone ensured me that the part was indeed in stock and would be shipped immediately.
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