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10 amp heater fuse blown

Discussion in 'Gen 2 Prius Care, Maintenance and Troubleshooting' started by William Hunter, May 29, 2019.

  1. William Hunter

    William Hunter New Member

    Joined:
    May 29, 2019
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    Location:
    indiana
    Vehicle:
    2004 Prius
    Model:
    Three
    My heater fuse blows only when needing heat doesn't blow when AC is set to max cold Replaced the heater control valve still blowing the 10 amp fuse only on heat
     
    #1 William Hunter, May 29, 2019
  2. Patrick Wong

    Patrick Wong DIY Enthusiast

    Joined:
    Mar 8, 2008
    18,199
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    Location:
    Green Valley, AZ
    Vehicle:
    2015 Prius
    Model:
    Two
    That fuse provides 12V to the electric air conditioning coolant pump (not to be confused with the main engine coolant pump which is driven by the serpentine belt) which circulates engine coolant when the engine is not running. That pump probably has a short in the motor which is causing the 10A fuse to blow.
     
    #2 Patrick Wong, May 29, 2019
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