Radiator Overflow Bottle with Cap Dorman 603-423 - 1AROB00077

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: 16470-74181, 16470-03050, 16405-74171, 16405-74240, 1647074181, 1647003050, 1640574171, 1640574240
  • Strengthened and redesigned in the vulnerable areas of failure
  • Plastic construction
  • Commonly called Coolant Reservoir by Toyota
  • Cap included
  • Does not have provision for Low Fluid Sensor
  • Does not include overflow hose

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.

  1. step : Remove the radiator coolant tank (0:17)
    • Use a pair of pliers to remove the clamp on the hose.
    • Pull the bottle up and out.
  2. step : install the new radiator coolant tank (0:48)
    • Insert the bottle onto the mount.
    • Use the pliers to re clamp the hose to the radiator.

Tools needed for replacement:

    Pliers, Cutters & misc Wrenches

  • Slip-Joint Pliers

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Vehicle Fit

  • 1994-1996 Lexus ES300 Radiator Overflow Bottle with Cap Dorman 603-423
  • 1995-1996 Toyota Avalon Radiator Overflow Bottle with Cap Dorman 603-423
  • 1992-1996 Toyota Camry Radiator Overflow Bottle with Cap L4 2.2L Dorman 603-423
  • 1994 Toyota Camry Radiator Overflow Bottle with Cap V6 3.0L Dorman 603-423

This part replaces:

  • OE # 1647074181
  • Dorman 603-423
Part #: 1AROB00077

Ships in 1-3 Business Days. Delivery times vary.

Brand #: 603-423

How-to Video:

(01:55 min)