Prius Prime A/C and heater not working

Discussion in 'Prime Care, Maintenance and Troubleshooting' started by BigPete, Aug 29, 2020.

  1. BigPete

    BigPete Member

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    My Prius is 2years old and needed the heater on as was a bit cold this evening here in the U.K., but it would only blow cold air.

    when it was hot a few days ago I wanted the AC on but was only blowing hot air.

    Any idea what the issue could be, a fuse?
     
    #1 BigPete, Aug 29, 2020
  2. jerrymildred

    jerrymildred Senior Member

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    It could be a fuse, I suppose. Only takes a couple minutes to find out. But unless you drive a lot more than most people, a two year old car should still be under warranty.
     
    #2 jerrymildred, Aug 29, 2020
  3. bisco

    bisco cookie crumbler

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    manual or auto?

    what temp did you set it to?

    what was the outside temp?
     
    #3 bisco, Aug 29, 2020
  4. BigPete

    BigPete Member

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    manual, 24oC, was 12oC out
     
    #4 BigPete, Aug 30, 2020
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  5. bisco

    bisco cookie crumbler

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    what model and model year?

    how many miles on her?
     
    #5 bisco, Aug 30, 2020
  6. BigPete

    BigPete Member

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    2018 Prius Plug-In, or Prime as called in USA
     
    #6 BigPete, Aug 30, 2020
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  7. bisco

    bisco cookie crumbler

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    thanks. can't think of a fuse that controls anything except the blwer motor. sounds like your ecu is confused.

    try disconnecting the 12v negative for a minute to reset the computers
     
    #7 bisco, Aug 30, 2020
  8. BigPete

    BigPete Member

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    Ok sounds like a plan I’ll pop out and do now.

    thanks.
     
    #8 BigPete, Aug 30, 2020
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  9. hill

    hill High Fiber Member

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    does the plug-in loose radio setting & such when you dump 12v?
    .
     
    #9 hill, Aug 30, 2020
  10. bisco

    bisco cookie crumbler

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    sometimes, not sure why
     
    #10 bisco, Aug 30, 2020
  11. BigPete

    BigPete Member

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    No it didn’t
     
    #11 BigPete, Aug 30, 2020
  12. BigPete

    BigPete Member

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    Still doesn’t heat in Auto or manual or the AC, blower works but no hot or cold, just seems to be whatever temp outside is blown in.
     
    #12 BigPete, Aug 30, 2020
    Last edited: Aug 30, 2020
  13. jerrymildred

    jerrymildred Senior Member

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    You didn't answer @bisco's 2nd question. How many miles on it? It's very likely under warranty at that age.
     
    #13 jerrymildred, Aug 30, 2020
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  14. BigPete

    BigPete Member

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    30,000, yeah I’ll contact the dealer
     
    #14 BigPete, Aug 30, 2020
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  15. jerrymildred

    jerrymildred Senior Member

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    Absolutely. The dealer should fix that for free if the UK warranty is anything like here. In fact, if you try fixing it, that might cause some issues with warranty coverage.
     
    #15 jerrymildred, Aug 30, 2020
  16. BigPete

    BigPete Member

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    It’s 5year, 100,000mile
     
    #16 BigPete, Aug 30, 2020
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