Saturn Radiator Overflow Bottle Dorman 603-121 - 1AROB00056

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.


  • Includes overflow cap
  • Direct replacement
  • Replaces dealer part numbers: 21030881
  • Plastic construction
  • Commonly called "Coolant Overflow Tank or Reservoir, or Expansion Tank"

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

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.

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Vehicle Fit

Year Make Model Description
1992-2002Saturn SC Coupe Saturn SC Coupe Radiator Overflow Bottle Dorman 603-121
1992-2002Saturn SL Sedan Saturn SL Sedan Radiator Overflow Bottle Dorman 603-121
1993-2001Saturn SW Wagon Saturn SW Wagon Radiator Overflow Bottle Dorman 603-121

This part replaces:

  • Dorman 603-121
  • OE # 21030881
Part #: 1AROB00056

Out of Stock

Brand #: 603-121