09 Prius, coolant valve makes continues noise and super hot

Discussion in 'Gen 2 Prius Care, Maintenance and Troubleshooting' started by Singh.seattle, Oct 22, 2018.

  1. Singh.seattle

    Singh.seattle Junior Member

    Joined:
    Oct 15, 2018
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    Vehicle:
    2009 Prius
    Model:
    Three
    hi...my in my 09 Prius, coolant valve makes continues noise and is super hot to touch.
    it seems like its stuck but I don't see any 1121 code. I replaced the coolant valve with the new dorman brand from oriellys. the problem persists. I tried bleed air many times via the both bleed taps . it make little effect and after few days I could hear the kinda stuck sounding coolant valve struggling.

    also I changed the trans fluid after around 40k miles and it was super dark no viscous. it was burnt badly and smelled burnt. I doubt the coolant valve is not working properly and transmission heats up causing the burns OR the chances the radiater is clogged or some pump is BAD ..I replaced the electric coolant pump and engine coolant pump recently. so what is causing the coolant valve to sound weird.?
     
    #1 Singh.seattle, Oct 22, 2018
  2. SFO

    SFO Senior Member

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    The engine and inverter are on different coolant systems. With the vehicle in 'ready' (wait for the engine to stop running), open the cap for the inverter coolant reservoir, look inside and you should notice a slight movement on the liquid surface, which means the inverter coolant pump is working. Or you can touch the pump with a finger or a stick and feel a vibration.

    What kind of OBD2 device are you using to retrieve DTCs with?

    How long between replacing the two separate pumps until you noticed the coolant valve issue?

    Did you use Toyota SLLC coolant when replacing both of the pumps?
     
    #2 SFO, Oct 26, 2018
    Raytheeagle likes this.
  3. amjohnson

    amjohnson Junior Member

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    Vehicle:
    2008 Prius
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    Five
    Did you figure out a solution mine is doing the same thing I just replaced it two days ago what's the exact same one from O'Reilly please help me if you found a solution this is what mind sounds like! Please please please please help me




    Posted via the PriusChat mobile app.
     
    #3 amjohnson, May 30, 2020
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