Our radiator 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:

  • Replacement for originals that are cracked or broken
  • Commonly called "Coolant Reservoir" assembly
  • Replaces dealer part number: 4A0-121-403, 4A0121403
  • Plastic construction
  • Direct replacement
  • Built to strict quality control standards
  • Does NOT include Cap

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

  • 1992-1994 Audi 100 Quattro without Cap Radiator Overflow Bottle
  • 1992-1994 Audi 100 without Cap Radiator Overflow Bottle
  • 1995-1998 Audi A6 without Cap Radiator Overflow Bottle
  • 1995-1998 Audi A6 Quattro without Cap Radiator Overflow Bottle
  • 1995-1998 Audi A6 Quattro Quattro without Cap Radiator Overflow Bottle
  • 1992-1994 Audi S4 without Cap Radiator Overflow Bottle
  • 1995 Audi S6 without Cap Radiator Overflow Bottle
Part #: 1AROB00051

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

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1A Auto Parts

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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