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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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Genuine BMW Isolator Grommet / Bump Stop - 13717542860

Genuine BMW # 13717542860

Price: $5.95

6.48
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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 Mounting Plate, BMW - E83 X3 Automatic

Expansion tank frame makes replacement a breeze!

Price: $174.27

230.30
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Expansion Tank Thermostat (75C), Mahle Behr - E83 X3 3.0si Automatic

High quality, 24 Month Warranty

Price: $71.99

88.25
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Coolant Expansion Tank Cap, Rein - E90 E92 F30 F32 F10 F12 F06, Rein - 17117639020

High quality replacement coolant cap with a 24 Month Warranty

Price: $16.71

18.97
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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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Coolant Expansion Tank, Behr - E82 128i/135i, E9X 325i/328i/330i/335i, E89 Z4

Stock replacement coolant tank for original cooling performance

Price: $66.38

134.89
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Expansion Tank Retaining Clip - 17111707777

Expansion Tank Clamp - 17111707777

Price: $9.99

11.06
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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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Coolant Expansion Tank - Genuine BMW - N20 N26 Engines

Genuine BMW Part # 17137642158 (17-13-7-642-158)

Price: $124.99

146.44
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Coolant Expansion Tank - Genuine BMW - N20 N26 Engines

Aftermarket Replacement for BMW Part # 17137642158 (17-13-7-642-158)

Price: $64.99

140.86
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Expansion Tank Vent Hose - E60 550i, E63 650i

Genuine BMW # 17127534917

Price: $44.52

60.90
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Coolant Expansion Tank - E34 530i 540i - E32 740i 740il 750il

Genuine BMW # 17111719110

Price: $112.99

139.89
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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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Small Coolant Reservoir, BMW - F8X M3/M4

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

Price: $115.44

137.52
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Coolant Expansion Tank - E28 M5, 524td

Genuine BMW Part Number 17112225352 / 17-11-2-225-352

Price: $149.99

178.70
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Coolant Expansion Tank, Rein - X3/X4 28i, 35i M40i

Replacement coolant reservoir identical to the original BMW part #17138616418

Price: $63.99

140.86
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Expansion Tank, BMW - F10 550i/M5, F13 650i/M6, F02 750i

Original replacement for your aged or damaged expansion tank. Genuine BMW part #17138610819. N63TU.

Price: $122.92

146.44
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Expansion Tank, Behr - F10 550i, F13 650i, F02 750i

OEM replacement for your aged or damaged expansion tank. Direct replacement for BMW part #17137601948. N63A.

Price: $72.99

140.86
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Intercooler Expansion Tank, Rein - F10 550i, F13 650i, F02 750i, X5/X6 50i

OEM-type replacement for your aged or damaged expansion tank. Direct replacement for BMW part #17137647281. N63A, N63TU.

Price: $61.99

110.23
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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

49.48
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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

49.48
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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

41.87
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Coolant Expansion Tank, Rein - E70, F15, F85 X5M, E71, F16, F86 X6M

Replacement coolant reservoir identical to the original BMW part #17138621092

Price: $72.99

140.86
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Expansion Tank - 17138621092 - E70,E71,F15,F16, F85, F86 - Behr

OEM Expansion Tank With Level Sensor

Price: $74.99

140.86
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Coolant/Washer Level Sensor (installs in expansion tank) - Many BMW (see list)

High Quality Replacement to BMW # 17137553919

Price: $15.99

28.84
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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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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 Mounting Plate, Rein - E53 X5 4.4/4.6is/4.8is

Expansion tank frame makes replacement a breeze!

Price: $68.99

132.95
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Expansion Tank Mounting Bracket, Rein - E46 323i/325i/328i/330i Manual Trans

Expansion tank frame makes replacement a breeze!

Price: $47.99

74.02
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Expansion Tank Mounting Bracket, Rein - E46 323i/325i/328i/330i Auto

Expansion tank frame makes replacement a breeze!

Price: $56.99

74.02
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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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Cooling System Plug, Rein - F3X, E60, F10, G30, E63, F06/F12/F13, F02, X5/X6

Blind Plug/Cap used in a variety of locations on coolant hoses and connectors.

Price: $6.99

11.33
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Expansion Tank, Rein - E53 X5 4.4/4.6is M62, Z3 non-M

Replacement coolant reservoir identical to the original BMW part #17107514964

Price: $58.99

140.86
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Expansion Tank, Rein - E30 318i, 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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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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Expansion Tank, Rein - E53 X5 4.4/4.8is N62

Replacement coolant reservoir identical to the original BMW part #17137501959

Price: $54.99

137.48
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Coolant Expansion Tank, Rein - E82, E9X, E84 X1

Replacement coolant reservoir identical to the original BMW part #17137640514

Price: $56.20

140.86
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Coolant Expansion Tank, Rein - E82 135i, E9X 335i, E84 X1

Replacement coolant reservoir identical to the original BMW part #17137640515

Price: $82.99

140.86
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Coolant Expansion Tank, Rein - E90 335d

Replacement coolant reservoir identical to the original BMW part #17138570079

Price: $78.99

140.86
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