Coolant Reservoir
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Dorman - OE Solutions Coolant Reservoir

Part No. 603-300 Warranty  

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Dorman’s Engine Coolant Recovery Tank is designed for enduring use. It resists the expansion and cracking that extreme temperature fluctuations can cause. Plus, the durable plastic construction prevents coolant fluid loss.

Product Features:
  • Comes with reservoir cap
  • Level sensor included (where applicable)
  • Direct replacement for a proper fit every time
  • Quality tested to ensure trouble-free installation and performance
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Cap Included:Yes
Mounting Hardware Included:No


by PowerReviews
Dorman - OE SolutionsCoolant Reservoir

(based on 1 review)

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  • 1 Stars



Reviewed by 1 customer

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(3 of 6 customers found this review helpful)


OEM Like Replacement

By Travis

from Wilmington, NC

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3 or more reviews submitted


  • Easy To Install


    Best Uses

      Comments about Dorman - OE Solutions Coolant Reservoir:

      Just installed my 4th coolant tank on my 1990 Cherokee. This is the first Dorman version I've purchased. I've been pleased with other Dorman products, so hopefully this one will last longer than the others.

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      Ask a question, get answers from real customers and in-house experts. Or contact Customer Care by email or call 1-877-238-2623.

      2 Questions | 3 Answers
      Displaying questions 1-2
      • Q:

        what hose sizes fit this reservoir ?
        Asked on 11/20/2013 by bob from United States

        1 answer



          Good question Bob, 14-mm hose fits this Coolant Reservoir.

          Answered on 11/20/2013 by Max from AAP
      • Q:

        my jeep 1989 Cherokee overheats and coolant overflows will this help me. i changed thermostat and the water pump
        Asked on 7/24/2010 by herb

        2 answers



          If the coolant overflows then you should be able to set it up so that the overflow flows into this recovery tank.

          Answered on 7/26/2010 by Mike from AAP
        • A:

          This is shaped like the factory piece. I am going to find one right now for my 87 Comanche.

          These cooling systems are very prone to problems as they age. If the tank you have is not cracked at one of the hoses now, it is probably not able to keep pressure because of a bad cap on the tank. My cap is cracked now, but previous experience has taught me that replacing the cap isn't going to work because the tank is already distorted and the new cap will never seal.

          I'd also check your electric fan for proper function.

          - Jeep Guy

          Answered on 1/19/2012 by mrfreakinwhite from Central MA
      Displaying questions 1-2

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