2010 Prius battery temperature and fan modes

Discussion in 'Gen 3 Prius Care, Maintenance & Troubleshooting' started by Shadyghabboun, Jul 28, 2022.

  1. Shadyghabboun

    Shadyghabboun New Member

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    Hello everyone

    Hope you are well and in good health

    I have a 2010 prius and recently i started monitoring the temperature of the battery and to be honest i am a bit worried about what i found ... Ambient temperature here is around 37-40C
    And my battery temps are at the beginning of the trip were
    Temp1 37C
    Temp2 43C
    Temp 3 36.2C

    and after 30 mins drive it was

    Temp 1 50.2C
    Temp 2 53.4C
    Temp 3 48.9C
    And these temps are a bit on the high values and these temps were while the AC is on !!! But what i gound odd is that when i use the AC the fan mode is always on 1 and after the 52 it goes to mode 5 , however when i am not using the AC the fan mode goes up gradually...
    What do you suggest me to check first ?

    Best Regards
     
    #1 Shadyghabboun, Jul 28, 2022
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  2. bisco

    bisco cookie crumbler

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    maybe it was designed that way?

    do you have toyota spec for battery temps to compare to?
     
    #2 bisco, Jul 28, 2022
  3. Shadyghabboun

    Shadyghabboun New Member

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    I was checking more posts about the temperature and it seems that even in hotter environments it should not reach such temps or at least for such a quick drive.

    as for the battery fan mode, I haven't found anything regarding this matter, it seems to have a somewhat complicated algorithm, but what I am referring to is that while using the AC the battery temperature rises up rather quickly, while it should be the other way around
     
    #3 Shadyghabboun, Jul 28, 2022
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  4. Shadyghabboun

    Shadyghabboun New Member

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    I am a bit of a newbie, and I was also wondering if this is the right place to post such a question or should I move it to another section?
     
    #4 Shadyghabboun, Jul 28, 2022
  5. rjparker

    rjparker Tu Humilde Sirviente

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    As a rule, if the car does not provide warnings it is ok. The system knows the ambient temperatures, load and normal battery temperature behaviors.

    Given the ambient is 40c/104f when parked, the battery starts out at that temp. We are around that ambient now; I will be driving for at least 30 minutes and will monitor.

    Results
    Drove about one hour total at 38c/101f ambient temperature. Hilly terrain around 60 mph. AC working well with a 24c/76f setpoint. The battery temp started at 38c and rose to 42c/107f.

    So your results may be high. My car has quality ceramic window film and a reflective silver paint. However I would suspect your battery air intake could be blocked or more likely the battery fan blower is dirty.
     
    #5 rjparker, Jul 28, 2022
    Last edited: Jul 28, 2022
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  6. Grit

    Grit Senior Member

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    Paging all the people who said turn you ac on and it will blow over the battery and cool down.

    I pulled almost everything from the back seats, bench, tannaeu cover, spare tire cover & etc out from the back to improve overall AC air circulation in the hatch. It helps out but you can only carry a single passenger. There are times when my battery stayed 107F with ac on full blast with hv fan on max
     
    #6 Grit, Jul 28, 2022
  7. CR94

    CR94 Senior Member

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    Battery temperature takes well over one hour to reach equilibrium.
    If you get in a situation requiring repeated braking (hills, congestion, many consecutive stop signs, whatever) it will go a lot higher.
     
    #7 CR94, Jul 29, 2022
  8. bisco

    bisco cookie crumbler

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    you're in the right place. unfortunately, there aren't a lot of people who monitor their temps and try to decrease them.
    there have been a few innovators though, if you can find the threads
     
    #8 bisco, Jul 29, 2022
  9. Noahdoge

    Noahdoge Active Member

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    Start here first. By your numbers it does not seem that the HV fan is functioning efficiently. It’s a very diy friendly job and will save you lots of $.
     
    #9 Noahdoge, Jul 29, 2022
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