Our coolant overflow bottles are some of the highest quality replacements on the market!

This radiator coolant overflow tank has been designed to replace the original design.

Specifications:

  • Direct replacement for originals that are cracked or broken
  • Replaces dealer part numbers: 17 11 1 723 520, 17111723520
  • Strengthened and redesigned in the vulnerable areas of failure
  • Plastic construction
  • Commonly called Expansion Tank by BMW
  • Fits E36, E39, & Z3 body chassis as listed
  • Does not include cap or coolant lever sensor
  • Buyer will need to reuse original cap & Sensor

Now you can buy a high quality coolant reservoir that is built to strict quality control standards. REPLACE your broken or cracked one now with this great fitting Radiator Overflow Bottle.

Lifetime Warranty

This item is backed by a Limited Lifetime Warranty. In the event this item should fail due to manufacturing defects during intended use, we will exchange the part free of charge (excludes shipping charges) for the original purchaser. Please keep your invoice for proof of this warranty.

4.0 / 5.0
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Arrived quickly
Tank arrived quickly and fits as it should. The pictures showed a cap being included, but it was not. In all fairness, at the bottom of the specs it said it was not. My fault for not reading everything. I was more interested in getting the correct fit. I had to buy the cap locally to finish the job. Still a good value.
May 13, 2017
Purchased
1 year ago
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Vehicle Fit

  • 1996-1999 BMW 318iS E36 Radiator Coolant Overflow Tank
  • 1998-1999 BMW 323iC E36 Radiator Coolant Overflow Tank
  • 1998-1999 BMW 323iS E36 Radiator Coolant Overflow Tank
  • 1992-1995 BMW 325i E36 Radiator Coolant Overflow Tank
  • 1992-1995 BMW 325iC E36 Radiator Coolant Overflow Tank
  • 1992-1995 BMW 325is E36 Radiator Coolant Overflow Tank
  • 1996-1998 BMW 328i E36 Radiator Coolant Overflow Tank
  • 1996-1999 BMW 328iC E36 Radiator Coolant Overflow Tank
  • 1996-1999 BMW 328iS Base Model Radiator Coolant Overflow Tank
  • 1997-1998 BMW 528i E39 Radiator Coolant Overflow Tank
  • 1995-1999 BMW M3 E36 Radiator Coolant Overflow Tank
  • 1997-2000 BMW Z3 Roadster Radiator Coolant Overflow Tank L6 2.8L
  • 1998-2002 BMW Z3 M-Series Roadster Radiator Coolant Overflow Tank L6 3.2L
  • 1999-2002 BMW Z3 M-Series Coupe Radiator Coolant Overflow Tank L6 3.2L

This part replaces:

  • OE # 17111723520
Part #: 1AROB00026

Ships Same Day for orders placed by 4 P.M. ET