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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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Expansion Tank Cap, CRP - 2002, E21, E12, E28, Big Coupe, E24, E23 735i, E26 M1

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

Price: $10.99

21.89
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Expansion Tank Cap, CRP - E30 325i, E34 525i M20

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

Price: $13.99

26.23
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Expansion Tank Kit, Rein - E39 525i/528i/530i

Kit with coolant reservoir, cap, and level sensor. OEM-type replacements for BMW part #17111436381.

Price: $64.99

142.30
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Expansion Tank Kit, Rein - E39 540i, E38 740i/iL/750iL, E31 840i/850i

Kit includes reservoir, cap, and sensor. OEM-type replacement for BMW part #17111741167

Price: $63.99

163.70
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Expansion Tank Kit, Rein - E53 X5 4.4/4.8is N62

Replacement coolant reservoir kit identical to the original BMW part #17137501959 with additional parts

Price: $66.99

140.86
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Expansion Tank Kit, Rein - E60, E63

Replacement coolant reservoir kit identical to the original BMW part #17137542986

Price: $65.99

146.44
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Expansion Tank, Rein - F10 535d/535i, F06/F12/F13 640i, F02 740i N55

Replacement coolant reservoir identical to the original BMW part #17137647283

Price: $85.99

140.86
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Expansion Tank Kit, Rein - F10 550i, F06/F12/F13 650i, F02 750i

Kit of reservoir, cap, and sensor replaces original BMW part #17137601948. N63A.

Price: $86.99

146.44
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Expansion Tank Mounting Plate, Rein - E83 X3 Automatic

Expansion tank frame makes replacement a breeze!

Price: $103.99

221.52
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Coolant Expansion Tank, Rein - E65/E66 745i/750i/760Li

Replacement coolant reservoir identical to the original BMW part #17137647713

Price: $51.99

146.44
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Coolant Expansion Tank - E60 M5,E63 M6

Genuine BMW # 17112283345

Price: $141.60

175.72
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Coolant Expansion Tank, Rein - R56 MINI Cooper S

High quality, 24 Month Warranty

Price: $53.99

87.51
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Coolant Expansion Tank - E34 M5

Genuine BMW # 17112227091

Price: $132.58

160.33
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Expansion Tank Mounting Plate, BMW - E53 X5 4.4/4.6is/4.8is

Expansion tank frame makes replacement a breeze!

Price: $113.10

138.23
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Brass Radiator Bleeder Screw - Most BMWs

Never break your BMW bleeder screw again!

Price: $5.99

6.27
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Coolant Expansion Tank - E12 528i & 530i (1977-1981)

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

Price: $99.79

114.28
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Expansion Tank Vent Hose, BMW - F22 M235iR/M240iR

Vent hose from expansion tank on Racing models.

Price: $67.08

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Coolant Level Sensor With Round Pins - E30 E34 E24 E32 (1987-1995)

Common cause of false warning light for coolant level

Price: $14.99

65.54
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Coolant Expansion Tank Kit, Rein - E65/E66 745i/750i/760Li

Kit with coolant reservoir, cap, and level sensor. OEM-type replacements for BMW part #17137647713

Price: $65.99

163.88
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Coolant Expansion Tank - E28 533i 535i (1983-1988)

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

Price: $119.74

133.72
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Expansion Tank Cap, Reutter - Many Vintage BMW Applications

High quality replacement radiator cap with a 24 Month Warranty

Price: $11.99

20.15
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Coolant Expansion Tank - E24 633CSi 635CSi (1983-1989)

Original BMW coolant reservoir for E24 6-Series

Price: $91.31

106.29
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Expansion Tank Threaded Cap - E30 325e/325i, E28 528e, E24 633CSi

Black threaded plastic cap for coolant reservoir

Price: $7.99

28.93
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Coolant Expansion Tank, Behr - E30 325i 88+, E36 M3 Euro, MZ3 Euro

Replacement for your aged or damaged expansion tank

Price: $37.99

123.38
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Expansion Tank Mounting Plate, BMW - E53 X5 Automatic

Expansion tank frame makes replacement a breeze!

Price: $62.95

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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: $123.01

146.44
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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: $127.81

146.44
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Coolant Expansion Tank, Complete, Rein - E46 (non-M), X3, X5 3.0 (17117573781)

Complete tank with cap and level sensor

Price: $56.99

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Coolant Expansion Tank, Behr OEM - F10 528i 528ix N20 4-Cylinder (2012-2016)

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

Price: $69.86

146.44
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Coolant Expansion Tank, Genuine BMW - F48 X1 F39 X2 28i

Original BMW Expansion Tank for engine coolant on 4-cylinder X1 and X2 models.

Price: $88.91

101.88
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Coolant Expansion Tank, Genuine BMW - F39 X2 M35i

Original BMW Expansion Tank for engine coolant on 2018+ X2 M35i.

Price: $109.88

127.36
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Coolant Expansion Tank, Mahle Behr - F48 X1 F39 X2 28i

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

Price: $77.63

101.88
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