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Hv battery exhaust tube missing

Discussion in 'Gen 2 Prius Technical Discussion' started by Aaron Vitolins, Sep 13, 2015.

  1. Aaron Vitolins

    Aaron Vitolins Senior Member

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    Hey everyone, I've had my prius for 18 months now, it has 267,000 miles. in january i replaced my hv battery at 238,000 miles due to the fact it had lowered battery capacity, and that i got a great deal on a used hv battery from a wrecked 08 Prius.

    Well ever since I've owned this car the exhaust vent tube coming from the battery that vents hot air out to the passenger side rear finder is missing. Should i look in to finding that part. like is it even worth it?
    I guess I'm just trying to plan for the long run with this newer battery.

    It kinda makes me wonder how long that part has been missing, like how many years?? or if that could have possibly affected my previous battery capacity, since being subject to soaking in heat isn't good for the battery.

    What do y'all think? Thanks everyone :)
     
    #1 Aaron Vitolins, Sep 13, 2015
  2. dorunron

    dorunron Senior Member

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    Maybe a previous owner left it off when changing the 12 volt?
     
    #2 dorunron, Sep 13, 2015
  3. greasemonkey007

    greasemonkey007 Active Member

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    I would definitely get one. I would probably try to find one from a salvage yard or off a wrecked car. No telling what Toyota would want for it.
     
    #3 greasemonkey007, Sep 13, 2015
  4. Aaron Vitolins

    Aaron Vitolins Senior Member

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    That's what I think too. It has an optima battery that seems pretty old (judging by the dust, and performance, about 12.3 volts nowdays)
     
    #4 Aaron Vitolins, Sep 13, 2015
  5. Aaron Vitolins

    Aaron Vitolins Senior Member

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    I'm still kicking my self for not buying the one out of the wrecked out.. I wasn't even thinking about it. They probably would have given it too me free aswell :( I think I will start looking for one now
     
    #5 Aaron Vitolins, Sep 13, 2015
  6. Patrick Wong

    Patrick Wong DIY Enthusiast

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    #6 Patrick Wong, Sep 13, 2015
    Last edited: Sep 13, 2015
  7. Aaron Vitolins

    Aaron Vitolins Senior Member

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    Is it true then gen 3 got rid of this tube? Maybe I'm wrong, but if so that would seem very odd of toyota
     
    #7 Aaron Vitolins, Sep 13, 2015
  8. bisco

    bisco cookie crumbler

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    maybe if it's vented to the 12v area, it has to leave via the fender grille.
     
    #8 bisco, Sep 13, 2015
  9. Mendel Leisk

    Mendel Leisk Senior Member

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    On 3rd, there's tight ductwork from inlet to fan to battery, and on the far side just a short duct dumps air into the underfloor air pocket: from there on its just open. There's flap equipped air outlets at both back corners.
     
    #9 Mendel Leisk, Sep 13, 2015
    Last edited: Sep 13, 2015
  10. Patrick Wong

    Patrick Wong DIY Enthusiast

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    I misunderstood your OP. You are referring to the duct that routes hot air from the traction battery to the area where the 12V battery is located - not the duct that provides air from the passenger compartment.

    The absence of that duct probably will slightly impair battery cooling, to the extent that a small vacuum is created when the car is in motion and can help suck air out of the exhaust duct. It probably is not the end of the world to have that duct missing though.
     
    #10 Patrick Wong, Sep 13, 2015
  11. Aaron Vitolins

    Aaron Vitolins Senior Member

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    Thanks guys! I guess I'll look for one at some local salvage yards. I like to think I'm keeping my battery cool as possible
     
    #11 Aaron Vitolins, Sep 13, 2015
  12. dorunron

    dorunron Senior Member

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    If you do find it, try to get the fastener's at the same time.

    In the end, the car should look like this.

    12battery2.jpg
     
    #12 dorunron, Sep 13, 2015
  13. Aaron Vitolins

    Aaron Vitolins Senior Member

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    Thank you! Maybe I should just rob my sisters Prius for the parts? Lol :D
     
    #13 Aaron Vitolins, Sep 13, 2015
  14. dorunron

    dorunron Senior Member

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    If you can live with your conscience... Surely though you are just joking.

    All the best to you.
     
    #14 dorunron, Sep 13, 2015
  15. Aaron Vitolins

    Aaron Vitolins Senior Member

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    Thank you, and yes I'm joking! :).

    I'll update this thread if I get the part
     
    #15 Aaron Vitolins, Sep 13, 2015
    m.wynn and dorunron like this.
  16. m.wynn

    m.wynn Senior Member

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    Have a little ghetto fun and fab your own out of, say, cardboard and duct tape...

    I agree with Dr. Wong, and lean even more in the direction of thinking that thing has little to no effect on battery temp.
     
    #16 m.wynn, Sep 13, 2015
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  17. Aaron Vitolins

    Aaron Vitolins Senior Member

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    I agree. The only time it might actually make a difference is on a long road trip, because of long running time it could possible warm up everything under there after hours of warm air blowing around under the cargo floor. Still not too big of a deal
     
    #17 Aaron Vitolins, Sep 14, 2015
  18. Mendel Leisk

    Mendel Leisk Senior Member

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    Strange, 3rd gen has dispensed with that exit duct, just dumps the air and counts on it to meander across the space and out the two exit ducts. Whenever the battery fan's running there's increased air pressure, to make this happen.
     
    #18 Mendel Leisk, Sep 14, 2015
  19. Aaron Vitolins

    Aaron Vitolins Senior Member

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    Odd. Some taxi drivers seem to think thats why the gen 3 battery doesn't last as long as a gen 2 taxi. Who knows!
     
    #19 Aaron Vitolins, Sep 14, 2015
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