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: 8D0121403L, 3B0121321, 8D0 121 403 L, 3B0 121 321
  • Strengthened and redesigned in the vulnerable areas of failure
  • Plastic construction
  • Commonly called "Coolant Overflow Tank or Reservoir" by Audi & Volkswagen
  • Does NOT include the Cap
    • Buyer will need to reuse original cap

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.

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Vehicle Fit

  • 1998 Audi A4 (From VIN W007800) without Cap Radiator Overflow Bottle for Models with V6 2.8L
  • 1998 Audi A4 (From VIN W007800) without Cap Radiator Overflow Bottle for Models with L4 1.8L
  • 1999-2002 Audi A4 without Cap Radiator Overflow Bottle for Models with L4 1.8L
  • 1999-2002 Audi A4 without Cap Radiator Overflow Bottle for Models with V6 2.8L
  • 1998 Audi A4 Quattro (From VIN W007800) without Cap Radiator Overflow Bottle for Models with V6 2.8L
  • 1998 Audi A4 Quattro (From VIN W007800) without Cap Radiator Overflow Bottle for Models with L4 1.8L
  • 1998 Audi A4 Quattro Quattro without Cap Radiator Overflow Bottle for Models with L4 1.8L
  • 1998 Audi A4 Quattro Quattro without Cap Radiator Overflow Bottle for Models with V6 2.8L
  • 1999-2002 Audi A4 Quattro without Cap Radiator Overflow Bottle for Models with V6 2.8L
  • 1999-2002 Audi A4 Quattro without Cap Radiator Overflow Bottle for Models with L4 1.8L
  • 1999-2002 Audi A4 Quattro Quattro without Cap Radiator Overflow Bottle for Models with L4 1.8L
  • 1999-2002 Audi A4 Quattro Quattro without Cap Radiator Overflow Bottle for Models with V6 2.8L
  • 1998-2001 Audi A6 without Cap Radiator Overflow Bottle for Models with V6 2.8L
  • 1998-2001 Audi A6 Quattro Quattro without Cap Radiator Overflow Bottle for Models with V6 2.8L
  • 1998-2001 Audi A6 Quattro without Cap Radiator Overflow Bottle for Models with V6 2.8L
  • 2003 Audi RS6 without Cap Radiator Overflow Bottle for Models with
  • 2004 Audi RS6 without Cap Radiator Overflow Bottle for Models with V8 4.2L
  • 2000-2002 Audi S4 without Cap Radiator Overflow Bottle for Models with V6 2.7L
  • 1998-2005 VW Passat without Cap Radiator Overflow Bottle for Models with L4 1.8L
  • 1998-2004 VW Passat without Cap Radiator Overflow Bottle for Models with V6 2.8L
  • 2004-2005 VW Passat without Cap Radiator Overflow Bottle for Models with L4 2.0L Diesel
Part #: 1AROB00040

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

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Customer Feedback

"Thanks for the fast reliable service. Great price, and the headlights were as good as oem or better!!! Keep up the good work..."
- Dwuan M.
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