Stains on 2017 ceiling interior - possible roof leak?

Discussion in 'Gen 4 Prius Care, Maintenance and Troubleshooting' started by aang86, Jul 30, 2022.

  1. aang86

    aang86 Junior Member

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    Hi all - I got a used 2017 Prius Two last year and it's been great, except today... I noticed these rather large brown stains above the rear doors on the ceiling, plus a few tiny rust-colored spots nearby.

    My first thought was water damage. It's a little odd, because I'm in Southern California and it's summer - so it hasn't rained in months. The car DOES get condensation on it overnight. I don't drive every day, so at most, this could have been happening over the course of a week before I saw it.

    Could it be the seal that runs along the roof?? The car does sit outside in the sun all day because I don't have a garage. Just wondering if this has happened to anyone else and if so, what you did about it? I had a 2007 before this, and nothing like that ever happened with that car. Any thoughts appreciated!!

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  2. CooCooCaChoo

    CooCooCaChoo Active Member

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    Or it could be leaking from the shark fin antenna.
     
  3. Elektroingenieur

    Elektroingenieur Senior Member

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    The locations are consistent with the condensation problem for which Toyota Canada issued a service bulletin, discussed in my 2018 posting TSB (Canada): Condensation Dripping from the Headliner.
     
  4. aang86

    aang86 Junior Member

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    Oh that is super helpful to know! Thank you! I was just so puzzled because we haven't had any problems when it rained. I read your other post. Hoping maybe an autobody shop can help me with the repair...
     
  5. Hidyho

    Hidyho Senior Member

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  6. CooCooCaChoo

    CooCooCaChoo Active Member

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    Actually cleaning it is gonna be a pain in the nice person. Another forum user scrubbed the headliner trying to clean a stain and it came apart.
     
  7. aang86

    aang86 Junior Member

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    Yikes. Yeah, I'm not looking forward to cleaning it.

    A small update: I haven't gotten the car to an autobody shop yet, but I've noticed some faint staining on the rear passenger seats, too. Wth. I'm totally flummoxed as to how a little condensation could be causing this much of a problem.
     
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