Audi A8 A8 Quattro S8 Radiator Overflow Bottle - 1AROB00038

Warranty & Shipping
Product Reviews
Vehicle Fit

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.


  • Direct replacement for originals that are cracked or broken
  • Replaces dealer part numbers: 4D0 121 403C, 4D0121403C
  • Strengthened and redesigned in the vulnerable areas of failure
  • Plastic construction
  • Commonly called "Coolant Overflow Tank or Reservoir, or Expansion Tank" by Audi
  • 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.

Item Condition: New

WARNING: Cancer and Reproductive Harm -

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.

There are no reviews for this item.
Will this fit my car? Add a vehicle to make sure
Customer Q&A
Ask a question to 1A Auto customers who purchased the product
No questions have been asked about this item.
Year Make Model Description
1998-1999Audi A8 Audi A8 Radiator Overflow Bottle
1997-2002Audi A8 Quattro Audi A8 Quattro Quattro Radiator Overflow Bottle for Models with V8 4.2L
1998-1999Audi A8 Quattro Audi A8 Quattro Radiator Overflow Bottle
2003Audi A8 Quattro Audi A8 Quattro Quattro Radiator Overflow Bottle for Models with V8 4.2L
2001-2002Audi S8 Audi S8 Radiator Overflow Bottle
2003Audi S8 Audi S8 Radiator Overflow Bottle
Only 2 left in stock
Part #: 1AROB00038

Order must be placed by 4pm ET

Get it in: 2 - 4 Business Days

Want it sooner? Choose Next Day Air at Checkout