broken thermostat bolt

Discussion in 'Gen 3 Prius Main Forum' started by mhdriver, Jan 14, 2026 at 2:02 PM.

  1. mhdriver

    mhdriver Member

    Joined:
    May 1, 2023
    76
    32
    1
    Location:
    florida
    Vehicle:
    2015 Prius
    Model:
    V
    Well, pulling off the thermostat and when I got to the bolt, the head broke off. I did remove the thermostat and the bolt still protrudes. What is the best way to remove this?[​IMG] [​IMG]
     
    #1 mhdriver, Jan 14, 2026 at 2:02 PM
    Last edited: Jan 14, 2026 at 2:13 PM
  2. ASRDogman

    ASRDogman Senior Member

    Joined:
    May 29, 2018
    7,652
    3,940
    0
    Location:
    Florida
    Vehicle:
    2010 Prius
    Model:
    Two
    Please don't start a new thread for the same subject. Post it in the original postings....
    Heating it up to loosen it is the best way. Lot's of penetrating oil, and let it soak.
    You "might" be able to twist it out with vice grips.

    If not, you can drill a hole in the middle and hopefully and easy out will work.

    If not, drill it out and tap new threads.
     
    PriusCamper likes this.
  3. Mendel Leisk

    Mendel Leisk MMX GEN III

    Joined:
    Oct 17, 2010
    60,505
    41,647
    80
    Location:
    Greater Vancouver, British Columbia, Canada
    Vehicle:
    2010 Prius
    Model:
    Touring
  4. mhdriver

    mhdriver Member

    Joined:
    May 1, 2023
    76
    32
    1
    Location:
    florida
    Vehicle:
    2015 Prius
    Model:
    V
    Will post anything else in original thread. Got to say this is discouraging since it's not in the open. Getting penetrating oil and a torch today.