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Intermittent heat

Discussion in 'Gen 3 Prius Main Forum' started by Hisparadox, Oct 3, 2019.

  1. Hisparadox

    Hisparadox New Member

    Joined:
    Oct 3, 2019
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    Location:
    New York
    Vehicle:
    2012 Prius
    Model:
    Two
    so I have a 2012 Prius model 2 Some days the heat does not come up and it just blows cold and then while driving it will kick in with hot air. But when sitting still it will blow how for a while. Like 30 minutes. But then go cold again Any ideas?
     
    #1 Hisparadox, Oct 3, 2019
  2. BZzap!

    BZzap! Senior Member

    Joined:
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    Vehicle:
    2012 Prius
    Model:
    Two
    Sound like a bad blend door actuator or control.
     
    #2 BZzap!, Oct 3, 2019
    Raytheeagle likes this.
  3. bisco

    bisco cookie crumbler

    Joined:
    May 11, 2005
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    Location:
    boston
    Vehicle:
    2012 Prius Plug-in
    Model:
    Plug-in Base
    air in the coolant? sticky thermostat?

    how many miles on her?
     
    #3 bisco, Oct 4, 2019
  4. Hisparadox

    Hisparadox New Member

    Joined:
    Oct 3, 2019
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    Location:
    New York
    Vehicle:
    2012 Prius
    Model:
    Two
    There’s 240,000 on the car. It had an overhead light come on and the reservoir was very low which I refilled
     
    #4 Hisparadox, Oct 4, 2019
  5. BZzap!

    BZzap! Senior Member

    Joined:
    Jun 13, 2012
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    Vehicle:
    2012 Prius
    Model:
    Two
    Lots of miles. The coolant being low is a clue that there is an underlying problem that’s baring it’s fangs. Do a thourgh inspection of all the hoses and other areas where you might see traces of coolant leaks. If the engine has any suspicious behavior, I would do a block and pressure check to see if you have any signs of a head gasket failure. With these kinds of miles, it’s highly probable.
     
    #5 BZzap!, Oct 5, 2019
    Robert Holt likes this.
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