Toyota 4Runner Radiator Overflow Bottle Dorman 603-420 - 1AROB00110

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
  • Replaces dealer part numbers: 1647075030
  • Plastic construction
  • Commonly called "Coolant Overflow Tank or Reservoir, or Expansion Tank"
  • Without Low Fluid 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.

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Vehicle Fit

  • 1996-2002 Toyota 4Runner Radiator Overflow Bottle V6 3.4L
  • 1996-2000 Toyota 4Runner Radiator Overflow Bottle L4 2.7L

This part replaces:

  • OE # 1647075030
  • Dorman 603-420
  • Hollander 671-50359
Part #: 1AROB00110
Brand #: 603-420