Coolant Reservoir

Discussion in 'Gen 2 Prius Care, Maintenance and Troubleshooting' started by Eric Hellgren, Dec 26, 2024 at 7:37 AM.

  1. Eric Hellgren

    Eric Hellgren New Member

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    Is replacing the coolant reservoir necessary?
     
    #1 Eric Hellgren, Dec 26, 2024 at 7:37 AM
  2. pasadena_commut

    pasadena_commut Senior Member

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    The overflow tank next to the radiator? Only if it is broken.

    Your post really makes no sense. You left out some key information, like the problem you are trying to solve.
     
    #2 pasadena_commut, Dec 26, 2024 at 8:56 PM
  3. ChapmanF

    ChapmanF Senior Member

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    That looks like a gen 3 setup though. I think the OP is talking about a gen 2. That's got a plain coolant reserve bottle, and radiator cap on the radiator.
     
    #3 ChapmanF, Dec 26, 2024 at 11:33 PM
  4. Eric Hellgren

    Eric Hellgren New Member

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    Our 2009 Prius had a code P1151 Coolant Storage Tank. The dealer recommended replacing the heat storage tank for $3500. The actual problem was not diagnosed (malfunctioning temperature sensor, 3-way valve problem, leaking tank, etc). I thought the price was excessive. I replaced the 3-way valve, but the check engine light has come on again after about 100 miles.

    Can this tank be bypassed? Can the problem actually be diagnosed? I read another post that other Prius models (for Europe?) did not have this coolant storage tank. Thanks for any advice.
     
    #4 Eric Hellgren, Dec 27, 2024 at 9:35 AM
  5. pasadena_commut

    pasadena_commut Senior Member

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    Read this thread:

    SOLVED P1151 Coolant Heat Storage Tank | PriusChat

    That price is excessive. You should be able to pick up one of these tanks for very little at a junkyard, they hardly ever fail. Before doing that, be sure that all the air is bled out of the system. Watch these two videos for easy to follow instructions:


     
    #5 pasadena_commut, Dec 28, 2024 at 12:48 AM
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