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Heater/AC won’t engage

Discussion in 'Gen 3 Prius Main Forum' started by Andrew Colvin, Jan 3, 2020.

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  1. Andrew Colvin

    Andrew Colvin Junior Member

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    So recently I have been having an issue where my heater or AC won’t turn on. All the buttons work, but nothing blows from the vents. It’s weird because sometimes it works fine and it turns on.

    Why would it sometimes work and sometimes not?

    Is it just the blower motor? Relay? Something else?
     
    #1 Andrew Colvin, Jan 3, 2020
  2. bisco

    bisco cookie crumbler

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    there is a motor, and there is a circuit board. probably one or the other. it is under the cabin filter. you can find threads here, or possibly @NutzAboutBolts youtube videos.
     
    #2 bisco, Jan 3, 2020
  3. Johnny Cakes

    Johnny Cakes Senior Member

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    Maybe I'm stating the obvious, but your symptoms perfectly fit the unit being in AUTO mode and the ambient cabin temperature near the the set temperature ("nothing blows") and then "works fine and turns on" when the ambient cabin temperature is different than the set temperature. That would explain why "it sometimes work and sometimes not."
     
    #3 Johnny Cakes, Jan 3, 2020
    Montgomery likes this.
  4. NutzAboutBolts

    NutzAboutBolts Senior Member

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    its best if you post with a video to show the symptoms so people can get a better look at the issues
     
    #4 NutzAboutBolts, Jan 3, 2020
  5. Andrew Colvin

    Andrew Colvin Junior Member

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    That turned out to be the problem. I bought a new motor and it was super easy to install. No more lackluster blow strength or intermittent power. Thank you!!!
     
    #5 Andrew Colvin, Jan 22, 2020
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  6. bisco

    bisco cookie crumbler

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    well done!(y)
     
    #6 bisco, Jan 22, 2020
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