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2007 prius coolant has disappeared

Discussion in 'Gen 2 Prius Care, Maintenance and Troubleshooting' started by Irfanmir, Feb 6, 2022.

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  1. Irfanmir

    Irfanmir New Member

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    Hi all.
    I am new to this forum and posting my first problem. I have 2007 prius 250k miles. The problem is that the coolant tank which is located above the radiator is empty. I have topped up coolant few weeks ago but now the tank is completely dry. This problem came over a year ago and then i changed the radiator and the problem was solved. But this problem has creeped up again. I have checked the engine oil which is fine and no sign of water mixing through bad gaskit. I wonder if the radiator has gone again in just over a year time?
    Thanks in advance for your help.
     
    #1 Irfanmir, Feb 6, 2022
  2. SFO

    SFO Senior Member

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    Welcome to PriusChat!!
    The plastic coolant overflow tank isn't a good indicator, please use the actual radiator for gauging the coolant level.

    Did you notice any puddles of pink coolant (the color of the recommended Toyota SLLC fluid) under the vehicle after parking?

    Given the mileage, when was the last time the ICE water pump was replaced?
     
    #2 SFO, Feb 6, 2022
    Last edited: Feb 6, 2022
    cyberpriusII and JC91006 like this.
  3. JC91006

    JC91006 Senior Member

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    +1 the reservoir is not a good indicator of coolant level. You should check the radiator and only be alarmed if that level is low as well
     
    #3 JC91006, Feb 6, 2022
  4. cyberpriusII

    cyberpriusII Prodigyplace says I'm Super Kris

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    And check the coolant level in the What IS That thing...(inverter tank).

     
    #4 cyberpriusII, Feb 6, 2022
  5. pasadena_commut

    pasadena_commut Senior Member

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    Agreed, but note that the cap is on a weird stalk that comes off the side of the radiator. Support that stalk with one hand while unscrewing the cap with another. Pretty sure a big guy could snap that thing off by pushing down too hard or using too much torque if the cap was stuck. Take off the black plastic front shield (the one over the radiator) first, for better access. Also, no tools are needed to remove the pins that hold that in place, just reach underneath with a finger and push up gently on the center pins.
     
    #5 pasadena_commut, Feb 7, 2022
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