Isuzu NP-R NQ-R NR-R Radiator Overflow Bottle with Cap Dorman 603-5603 - DMROB00016


This radiator coolant overflow tank has been redesigned to fix issues with the original factory design.


  • Brand New Dorman Radiator Overflow Bottle
  • Commonly called "Coolant Overflow Tank" or "Reservoir"
  • Includes Cap
  • Replaces dealer part number: 8-98178-178-0, 8-97223-012-2, 8-97553-012-2, 8981781780, 8972230122, 8975530122
  • Strengthened and redesigned in the vulnerable areas of failure
  • Replacement for originals that are cracked or broken
  • Plastic construction

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 part.

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
1996-2007Isuzu NP-R Isuzu NP-R Radiator Overflow Bottle with Cap Dorman 603-5603
1996-2010Isuzu NQ-R Isuzu NQ-R Radiator Overflow Bottle with Cap Dorman 603-5603
2005-2010Isuzu NR-R Isuzu NR-R Radiator Overflow Bottle with Cap Dorman 603-5603

This part replaces:

  • Dorman 603-5603
  • OE # 8972230122
  • OE # 8981781780
Only 2 left in stock
Part #: DMROB00016

Order must be placed by 4pm ET

Get it in: 2 - 4 Business Days

Want it sooner? Choose Next Day Air at Checkout

Brand #: 603-5603