The hybrid battery fan not working !!

Discussion in 'Gen 3 Prius Technical Discussion' started by MSF1344, Nov 8, 2019.

  1. MSF1344

    MSF1344 New Member

    Joined:
    Oct 27, 2019
    13
    1
    0
    Location:
    UK
    Vehicle:
    2013 Prius
    Model:
    Active
    Hi , I recently bought my 2013 prius but I have never noticed the hv battery fan working . when the car was in ready mode i opened the back door and put my ear on vent but nothing hear . I live in cold climate area is it because of that or the fan should work all the time ? never had a warning light .
     
  2. jerrymildred

    jerrymildred Senior Member

    Joined:
    Oct 28, 2016
    6,255
    7,843
    0
    Location:
    Tampa, FL
    Vehicle:
    2017 Prius Prime
    Model:
    Prime Premium
    The fan runs at whatever speed (from 0-6, iirc) necessary to maintain a safe battery temperature. In cool weather, I would not only not expect to hear it, but I would be concerned if I did. There are lots of OBDII dongles and phone apps you can get that will inexpensively monitor all sorts of stuff including fan speeds and battery temperatures if you're curious. Or just drive it hard with lots of hard acceleration and regenerative braking for 10 minutes or so to heat up the battery and then dangle some tissue paper in front of the vent to check for air flow.

    Or, just drive it. In the unlikely event that the fan isn't working, the car will tell you if the battery gets too warm. It will put a light on the dash and you can read the specific code with a code reader.

    But those are unusual circumstances. In your climate, the battery fan has the easiest job in the world. :D
     
  3. RRxing

    RRxing Senior Member

    Joined:
    Jul 7, 2009
    2,038
    1,291
    0
    Location:
    Long Island, NY
    Vehicle:
    2017 Prius
    Model:
    Three Touring
    I usually just reach back and put my hand next to the vent during hot weather to feel if the fan is on or not. Never been able to actually hear it when it does run...
     
  4. jerrymildred

    jerrymildred Senior Member

    Joined:
    Oct 28, 2016
    6,255
    7,843
    0
    Location:
    Tampa, FL
    Vehicle:
    2017 Prius Prime
    Model:
    Prime Premium
    I've heard it in the Gen 2 on really hot days, but just barely. I often hear the two fans on my Prime here in FL, but only when stopped and usually after extended EV driving. The fans are radial which makes them quieter than typical propeller fans.
     
  5. MSF1344

    MSF1344 New Member

    Joined:
    Oct 27, 2019
    13
    1
    0
    Location:
    UK
    Vehicle:
    2013 Prius
    Model:
    Active
    Thanks for your answer @jerrymildred , probably get an obd2 dongle for peace of mind .
     
    jerrymildred likes this.
  6. bisco

    bisco cookie crumbler

    Joined:
    May 11, 2005
    83,244
    36,315
    0
    Location:
    boston
    Vehicle:
    2012 Prius Plug-in
    Model:
    Plug-in Base
    i've never heard the fan in 15 years of driving prius, and not even with my new hearing aids.

    i did put a tissue on the grille in hot weather once to confirm it was working
     
    jerrymildred likes this.
  7. PriusCamper

    PriusCamper Senior Member

    Joined:
    Mar 3, 2012
    3,144
    1,139
    0
    Location:
    Pacific Northwest, USA
    Vehicle:
    2007 Prius
    Model:
    Two
    Hybrid Assistant app has the best fan controller, but it's super slow to activate/latency... Dr. Prius App fan control is even more problematic...

    Most of all for every one OBD2 reader you can buy online that works, there's 5 that will be dead on arrival... Learn more here about difference between real and junk here: Hybrid battery diagnostic and repair tool for Toyota and Lexus
     
  8. Grit

    Grit Senior Member

    Joined:
    Aug 22, 2017
    2,566
    2,229
    1
    Location:
    BOY
    Vehicle:
    2012 Prius
    Model:
    Four
    Turn the heater on, let the hv bat soak up the heat. It will spin up to speed 1 when bat is 96 F. 102 F is speed 2.

    Free test, not require to buy a obd2 Bluetooth thing
     
  9. George W

    George W Active Member

    Joined:
    Mar 12, 2018
    397
    210
    1
    Location:
    San Antonio
    Vehicle:
    2008 Prius
    Model:
    Touring
    Opening the back passenger door will automatically turn the fan off, in a Gen 2.
     
  10. bisco

    bisco cookie crumbler

    Joined:
    May 11, 2005
    83,244
    36,315
    0
    Location:
    boston
    Vehicle:
    2012 Prius Plug-in
    Model:
    Plug-in Base
    you don't say
     
  11. PriusCamper

    PriusCamper Senior Member

    Joined:
    Mar 3, 2012
    3,144
    1,139
    0
    Location:
    Pacific Northwest, USA
    Vehicle:
    2007 Prius
    Model:
    Two
    Really? Usually whenever I try to open the back door all my fans try to get in the car?
     
  12. Mendel Leisk

    Mendel Leisk Titanic Social Director

    Joined:
    Oct 17, 2010
    35,821
    24,637
    80
    Location:
    Greater Vancouver, British Columbia, Canada
    Vehicle:
    2010 Prius
    Model:
    Touring
    I've never heard the fan. I used to have a scangauge connected, occasionally monitoring fan speed, and saw it stepping through the various stages. But yeah, it would be reassuring to hear it. I believe if it's badly clogged and/or not working, there's a warning on the dash??
     
  13. cnc97

    cnc97 Senior Member

    Joined:
    Mar 13, 2018
    950
    1,091
    28
    Location:
    Evansville, IN
    Vehicle:
    2010 Prius
    Model:
    Three

    :ROFLMAO:
     
Loading...