2002-05 Radiator Overflow Bottle with Cap Dorman 603-070 - 1AROB00226

Our coolant overflow bottles are some of the highest quality replacements on the market!


  • Brand New Radiator Overflow Bottle
  • Commonly called "Coolant Overflow Tank" or "Reservoir"
  • Strengthened and redesigned in the vulnerable areas of failure
  • Replacement for originals that are cracked or broken
  • Plastic construction
  • Includes 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

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.

  1. step : Removing the Air Filter Box (0:40)
    • Unclip the air box cover
    • Pull out the air filter by hand
    • Lift the air filter box up and out
  2. step : Removing the Coolant Bottle (1:03)
    • Slide back the coolant bottle hose clamps with pliers
    • Clamp the lower coolant bottle hose with vise-grip pliers
    • Pull the upper hose off the coolant bottle
    • Remove the three 10mm bolts from the coolant bottle
    • Pry the lower hose off the coolant bottle with a flat blade screwdriver
    • Pull the coolant bottle up and out
  3. step : Installing the Coolant Bottle (2:39)
    • Push the lower hose onto the coolant bottle
    • Remove the vise grip pliers from the lower hose
    • Lower the coolant bottle into place
    • Push the upper hose onto the coolant bottle
    • Insert the three 10mm bolts into the coolant bottle
    • Tighten the hose clamps with pliers
  4. step : Installing the Air Box (4:17)
    • Lower the air box into place using the locating tabs
    • Put the air filter into the air box
    • Clip on the air box cover
  5. step : Filling the Coolant (5:16)
    • Twist off the coolant bottle cap
    • Add coolant to the cold fill line
    • Twist on the coolant cap
    • Run the engine briefly
    • Allow it to cool down
    • Check the coolant level
    • Add coolant as necessary

Tools needed for replacement:

    Pliers, Cutters & misc Wrenches

  • Slip-Joint Pliers
  • Vise Grip Pliers

  • Ratchets & Related

  • Ratchet

  • Screwdrivers & Related

  • Flat Blade Screwdriver

  • Sockets - Metric

  • 10mm Socket

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Vehicle Fit

Year Make Model Description
2002-2005Ford Explorer Ford Explorer Radiator Overflow Bottle with Cap Dorman 603-070
2002-2005Mercury Mountaineer Mercury Mountaineer Radiator Overflow Bottle with Cap Dorman 603-070

This part replaces:

  • Dorman 603-070
  • OE # 3L2Z8A080AA
  • OE # 3L2Z8A080AB
Part #: 1AROB00226

Out of Stock

Brand #: 603-070

How-to Video:

(06:11 min)