No Heat

Discussion in 'Gen 2 Prius Main Forum' started by qmanqman, Oct 20, 2025 at 12:58 PM.

  1. qmanqman

    qmanqman Active Member

    Joined:
    Mar 29, 2020
    402
    130
    0
    Location:
    CO
    Vehicle:
    2007 Prius
    Model:
    One
    Ya I checked it this morning and had to add a few oz's. I'll keep checking after every drive.
     
    BiomedO1 likes this.
  2. pasadena_commut

    pasadena_commut Senior Member

    Joined:
    May 2, 2019
    2,512
    752
    0
    Location:
    Southern California
    Vehicle:
    2007 Prius
    Model:
    N/A
    That's a lot. I would suspect a leak. Have the radiator cap tested. One way they fail is that they open up at too low a pressure, but high enough that the coolant just evaporates when it blows out. Result: mysteriously disappearing coolant.