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AC/Heater Blower Issue

Discussion in 'Gen 3 Prius Main Forum' started by Auszero, Dec 15, 2021.

  1. Auszero

    Auszero New Member

    Joined:
    Apr 24, 2021
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    Location:
    Tucson, AZ
    Vehicle:
    2015 Prius
    Model:
    Three
    I have a 2015 Prius with an intermittent AC/Heater blower issue. When I turn the AC on it blows however the blower eventually stops. I power the climate system down and start up again and it blows for a while. The more powerful the fan is blowing the sooner the blower craps out. If I turn the heater on the blower does nothing at all regardless of fan speed.

    So far I've replaced the blower with I believe the integrated controller (the unit is a "A-Premium Heater Blower Motor with Fan Cage Replacement" from Amazon) and I still have the same problem.

    What do I replace or look at next?
     
  2. BZzap!

    BZzap! Senior Member

    Joined:
    Jun 13, 2012
    1,607
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    Vehicle:
    2012 Prius
    Model:
    Two
    Watch this video from South Main Auto. It is a Nissan that he is repairing but contains the same exact principles the Prius uses. The blower motor speed is controlled by a pulse width signal.
     
  3. Auszero

    Auszero New Member

    Joined:
    Apr 24, 2021
    3
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    0
    Location:
    Tucson, AZ
    Vehicle:
    2015 Prius
    Model:
    Three
    Thanks, the third gen Prius has the resistor built into the blower motor so it should have been replaced when I replaced the motor assembly. Any idea of what should be next? I can't imagine it would have the same problem twice.
     
  4. bisco

    bisco cookie crumbler

    Joined:
    May 11, 2005
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    Location:
    boston
    Vehicle:
    2012 Prius Plug-in
    Model:
    Plug-in Base
    idk, but it sounds like something is overheating or tripping and has to cool down or reset. a relay maybe?