BMW Expansion Tank Cap Parts

Showing 16 out of 16 part(s) found in our catalog.

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BMW Expansion Tank Cap
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KIT FREE SHIPPING
This kit contains the coolant expansion tank, the pressure cap and a new auto trans thermostat that mounts at the expansion tank.
BMW X5, 325i, 328i, X3, 330i, 330Ci, 325Ci, 325xi, 330xi, 323i & more
In Stock Status
In Stock Information Icon
Leaves warehouse within 1-2 business days.
$94.97
Reg
$98.93
List
$180.13
Please verify type and pressure rating of cap installed on vehicle prior to ordering. 1 per car.
BMW X5, 325i, 328i, X3, M3, 528i, 530i, 535i, 330i, 330Ci & more
In Stock Status
In Stock Information Icon
Leaves warehouse within 1-2 business days.
$25.99
Reg
$27.07
List
$23.88
Please verify type and pressure rating of cap installed on vehicle prior to ordering. 1 per car.
BMW X5, 325i, 328i, X3, M3, 528i, 530i, 535i, 330i, 330Ci & more
In Stock Status
In Stock Information Icon
Leaves warehouse within 1-2 business days.
$10.99
Reg
$11.45
List
$26.15
Now shipping latest updated version 17117639020. 1 per car.
BMW X5, 325i, 328i, X3, 528i, 530i, 535i, 330i, 335i, 540i & more
In Stock Status
In Stock Information Icon
Leaves warehouse within 1-2 business days.
$20.99
Reg
$21.86
List
$24.82
1 per car.
BMW X5, M3, 528i, 530i, 535i, 525i, M5, 535i xDrive, 750Li, 740i & more
In Stock Status
In Stock Information Icon
Leaves warehouse within 1-2 business days.
$21.99
Reg
$22.91
List
$24.82
KIT FREE SHIPPING
This kit contains the OEM expansion tank and cap along with the updated bleeder screw and one gallon of coolant.
BMW 540i, 740iL, 740i, 750iL, 850i, 840Ci, 540i Sport Wagon, 850Ci, 540iT, 850CSi & more
In Stock Status
In Stock Information Icon
Leaves warehouse within 1-2 business days.
$98.96
Reg
$103.08
List
$216.46
OEM
1 per car.
BMW 528i, 530i, 535i, 2002, 320i, 635CSi, 735i, 2002tii, 633CSi, 533i & more
Porsche 944, 928, 924
In Stock Status
In Stock Information Icon
Leaves warehouse within 1-2 business days.
$8.89
Reg
$9.26
List
$23.34
BMW X5, X3, M3, 530i, 330i, 540i, Z4, X1, M5, 750Li & more
Mini Cooper, Cooper Countryman, Cooper Paceman
In Stock Status
In Stock Information Icon
Leaves warehouse within 1-2 business days.
$5.99
Reg
$6.24
List
$20.22
1 per car.
BMW X5, M3, 528i, 530i, 535i, 525i, M5, 535i xDrive, 750Li, 740i & more
In Stock Status
In Stock Information Icon
Leaves warehouse within 1-2 business days.
$7.99
Reg
$8.32
List
$24.82
1 per car.
BMW 528i, 530i, 535i, 2002, 320i, 635CSi, 735i, 2002tii, 633CSi, 533i & more
Porsche 944, 928, 924
Available To Order Status
Available To Order Information Icon
Usually ships within 1-2 business days. Availability is not guaranteed.
$24.99
Reg
$26.03
List
$25.58
KIT FREE SHIPPING
This kit contains the coolant expansion tank, the pressure cap, and a new metal system bleeder screw.
BMW 528i, 530i, 525i, 525i Sport Wagon, 528iT
In Stock Status
In Stock Information Icon
Leaves warehouse within 1-2 business days.
$72.97
Reg
$76.01
List
$170.31
Please verify type and pressure rating of cap installed on vehicle prior to ordering. 1 per car.
BMW 325i, 325is, 318i, 325e, 528e, 325iC, 633CSi, 533i, 325
Available To Order Status
Available To Order Information Icon
Usually ships within 1-2 business days. Availability is not guaranteed.
$26.99
Reg
$28.11
List
$27.57
Please verify type and pressure rating of cap installed on vehicle prior to ordering. 1 per car.
BMW 325i, M3, 535i, M5, 325is, 318i, 325e, 528e, 325iC, M6 & more
In Stock Status
In Stock Information Icon
Leaves warehouse within 1-2 business days.
$4.99
Reg
$5.20
List
$20.00
1 per car.
BMW M3, M5, 524td
In Stock Status
In Stock Information Icon
Leaves warehouse within 1-2 business days.
$3.89
Reg
$4.05
List
$21.87
$193.99
Reg
$202.07
List
$235.55
BMW 745Li, 745i
In Stock Status
In Stock Information Icon
Leaves warehouse within 1-2 business days.
$56.99
Reg
$59.36
List
$63.30

The average cost of a BMW expansion tank cap is between $3.89 and $193.99.

The BMW expansion tank cap is one of the most ignored components of the cooling system on BMWs. The expansion tank cap serves two vital purposes. To begin, the cap maintains the proper pressure on the coolant to boost the system's efficiency. Second, by maintaining pressure on the coolant and cooling system, the cap prevents the coolant from boiling or expanding excessively. This cap is intended to resist 1.4 bar (20 PSI) of pressure before wearing out.

Caps are meant to guarantee that the cooling system's prescribed pressure is maintained at all times throughout operation by allowing air to escape in the event of overpressure. As a result, they should be regarded as the cooling system's "safety valve." A broken cap cannot adequately seal off the system or maintain it properly pressured, compromising the cooling system's proper operation. A faulty cap might cause even a new hose to fail.

The following symptoms can indicate a defective expansion tank cap:

  • A radiator tube (either heating or main) bursts
  • The nozzles explode
  • The reservoir bursts
  • The stove does not heat the air even when the engine is overheated. This frequently occurs when airing arises in the circuit - no pressure is formed in the system, from which the antifreeze boils
  • When you start your BMW, you may notice an unpleasant odor of burning oil coming from the air vents or white smoke coming from under the hood. This can occur if antifreeze leaks over a hot front pipe
  • Coolant traces develop on the pipe clamps

When the time comes to replace your BMW expansion tank cap, head over to AutohausAZ. Our fitment tool will provide you with a list of radiator caps that are guaranteed to fit your vehicle. If you have any questions regarding BMW expansion tank caps or any other part within our catalog, feel free to utilize our chat feature in the bottom right hand corner to connect with one of our auto parts experts.

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