Water in 12V battery compartment ?

Discussion in 'Gen 2 Prius Care, Maintenance and Troubleshooting' started by philip hallstedt, Jan 28, 2016.

  1. philip hallstedt

    philip hallstedt New Member

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    have 2008 Prius. Found the battery compartment full of water when I went to change the battery. About 3 quarts of water. All drain holes have rubber covers so removed one to drain and let dry, but I can't find the source of the water. Looked on sides of metal body. No clues? I did have the car go through a car wash but that should not create this issue. No water on carpet. Rear door seals in great shape. Thoughts?
     
  2. Fingers04501

    Fingers04501 Junior Member

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    Did you notice any moisture around the rear taillights?
     
  3. Stevewoods

    Stevewoods Senior Member

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    Not to be unwelcoming to a new person, but this is a common problem and there are numerous posts about it. Try searching about a bit and I bet you find your answer here on PriusChat without too much effort.
     
  4. valde3

    valde3 Senior Member

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    m.wynn likes this.
  5. Mendel Leisk

    Mendel Leisk Senior Member

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    What fingers said. And recheck the hatch seals, more exhaustively, say hosing the hatch area with someone inside?
     
  6. Patrick Wong

    Patrick Wong DIY Enthusiast

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    Here is one clue: Inspect the hatch opening at the upper corner, right side, looking at the weld seam hidden by the black plastic trim that runs longitudinally along the roof. You may find very mild cracking in a weld, but that will be sufficient to leak water into the hatch which ends up in the battery well.
     
  7. philip hallstedt

    philip hallstedt New Member

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    You are not unwelcoming. I am new and appreciate the sharing of your knowledge that this is a common problem. Appreciate the insight! Now if I can check the taillight and hopefully fix it.
    merged
    Not yet. Will check again.
     
  8. edthefox5

    edthefox5 Senior Member

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    I was in an accident a few years ago and replaced the rear tailight with a non oem light assy. It leaked. I got in the car hatch area with flashlight while someone hosed the car down and quickly saw dripping out of the tail light. It's amazing how just dripping water can fill the hatch up. I gooped it up and now ok.
    But I do have a weld crack also that patrick mentions and it leaks there too but not bad.

    Be aware the plastic black strips that run down each side of the roof just pop right off. There on clips. So pull up the end at the rear hatch area of that strip and look for long crack starting at weld area or progressing to that strip area.

    Btw, if the battery well is full there's water under the spare tire too. If you garage the car you can remove the rubber plug in the battery well.
    And under the spare tire.
    If you don't I might not recommend that as many many reports of rat infestation in a Prius and a fairly big hole in the bottom of the car
    will be a lighted entrance to a rat. I garage my car but drilled a hole through the rubber plugs enough to allow water to vent out. A weep hole.
    Instead of the huge grommet hole. Has worked very well.
     
  9. ELANGO

    ELANGO Junior Member

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    Hello, I am a new person, I own Toyota Prius 2006. Sorry, I don't know how to start a new conversation as I am new to this chat. So , My 12 V battery compartment is rusted not only the holder with long screw , but even underneath, My questions is, Is there any other plates or any other holders underneath the holder as I cannot see under the battery holder as it is severely rusted. But I can see some bolts and screws. I am not able to find any pictures or Vedios of 12 V battery compartment , may be because, this is the unique one. My car has 326000 miles on it , and self maintained and runs excellent so far. If any one can help me out , I would be great. Thank You.
     
  10. edthefox5

    edthefox5 Senior Member

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    There's been a few posts here and there about severely rusted battery wells. There was one recently where it was so bad there was a big hole where the battery should be sitting. I think that poster rigged something up. I will try to find it.

    Its rusted out because the car is leaking alot of water usually from the cracks in the hatch valley area that we are talking about in this thread.
    Fills the battery well full of water and rusts it out and under the spare tire area.

    Since not exactly sure how bad the rust is take out the 12 volt battery and post some good photos of the well area. Take out the rubber grommet too. If its really bad the battery may fall through the floor. Take the battery out and see how bad it is before the battery fall's out.
    If it does and shorts out the 12 volt buss you will be in for alot of $$$$$ to fix that.

    With that kind of miles I suspect the under side of the car is rusted ATH too. While your taking pictures take some of the front suspension too so we can see how bad it is.

    This is where having a mechanic or gas station change your oil is very beneficial because the side benefit is most will let you under the car to look around while it's up on the rack while he changes the oil. You may have to duke the guy $20 but its well worth it. I do that regularly and have taken lots of pictures of the chassis's on my cars. I have the iPhone app the camera lighted magnifier and that is awesome.

    I would imagine most people have never seen the underside of there car. Its pretty informative. But I guess ignorance is bliss.
     
  11. Mendel Leisk

    Mendel Leisk Senior Member

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    Moral of the story: pull everything out, say at least once a year. Good excuse would be to check the pressure on the spare tire.
     
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