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.

Threaded Cap for Coolant Level Sender Delete - E30 E36

Original BMW threaded cap is great for deleting the coolant level sensor on track cars.

Price: $7.47
7.86

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Screw Plug for Coolant Expansion Tank - 17111707818 - E46,E53,E83,E85

Quality aftermarket drain plug for expansion tank on many E46, E83, E53, and E85/E86 models.

Price: $4.74
7.69

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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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OEM Coolant Expansion Tank - E85 E86 Z4 2.5i 3.0i 3.0si (M54 & N52)

Mahle-Behr OEM antifreeze coolant reservoir for Z4 coupe and roadster models (2003-2008).

Price: $63.96
143.93

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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: $43.23
45.50

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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: $51.08
53.77

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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: $51.08
53.77

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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: $68.49
110.23

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Intake Coolant Expansion Tank, BMW - G87 M2, G80 M3, G82 M4

OE replacement for your aged or damaged expansion tank. Replaces BMW part #17138093925.

Price: $132.34
139.30

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Heater Pipe O-Ring - E46 323i/325i/328i/330i

Replacement o-ring for heater hoses and expansion tank

Price: $0.99

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Genuine BMW Isolator Grommet / Bump Stop - 13717542860

Genuine BMW # 13717542860

Price: $5.66

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

Stock replacement coolant tank for original cooling performance

Price: $194.97
235.55

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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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Genuine BMW Coolant Expansion Tank - E85 E86 Z4 2.5i 3.0i 3.0si

Original BMW antifreeze coolant reservoir for Z4 coupe and roadster models with the M54 or N52 engine (2003-2008).

Price: $148.92
156.76

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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: $153.99
189.86

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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/Coolant Bleeder Screw, Rein

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

Price: $2.99

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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: $52.99
137.48

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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: $21.99

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

Stock replacement coolant tank for original cooling performance

Price: $54.99
141.44

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Expansion Tank, OEM - F10 528i 2011 (N52)

Replacement for your aged or leaking expansion tank. OEM-type replacement for BMW part #17137647284

Price: $81.99
150.86

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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: $163.37
171.97

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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: $99.99
158.22

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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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Expansion Tank Vent Hose, BMW - F22 M235iR/M240iR

Vent hose from expansion tank on Racing models.

Price: $86.99

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

Genuine BMW # 17127534917

Price: $69.03
72.66

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

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

Price: $31.83
33.51

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

High quality, 24 Month Warranty

Price: $78.99
88.25

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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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Expansion Tank Retaining Clip - 17111707777

Used to connect the expansion tank to the mount plate (against the radiator) on E46, E85 Z4 & X5 3.0 / M54 models