2002-05 Ford Explorer Mercury Mountaineer Coolant Reservoir Dorman 603-070 - 1AROB00226

Frequently bought together

Warranty & Shipping
How-To & Tools
Product Reviews
Vehicle Fit

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 our limited lifetime warranty. In the event this item should fail due to manufacturing defects during intended use, we will replace the part free of charge.

  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

5.00/ 5.0
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
Just what they said it was perfect fix great price
April 12, 2019
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
2002-2005Ford Explorer Ford Explorer Coolant Reservoir
2002-2005Mercury Mountaineer Mercury Mountaineer Coolant Reservoir
Only 3 left in stock
Part 1AROB00226
In Stock

Order must be placed by 4pm ET
Delivery options for:

Estimated Arrival Cost

Deliveries made to PO Boxes and FPO may take longer. See our Shipping & Delivery for more information.

Brand #: 603-070