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Rear window stains from heat?

Discussion in '308/328' started by surfer, Mar 29, 2013.

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  1. surfer

    surfer Rookie

    Jul 19, 2008
    26
    #1 surfer, Mar 29, 2013
    Hi, since I got my car back from the garage the rear window has developed what look like oil stains in a diamond formation. Could this be caused by heat coming from the engine?

    I've tried to clean them off but have had no luck. I was wondering whether anyone else had experienced something similar?
     
  2. plankeracer

    plankeracer Rookie

    Jul 6, 2011
    42
    Bergen Norway
    #2 plankeracer, Mar 29, 2013
    It could be the stains from the tempering prosess when the glass was made.
    every tempered glass have them, and you only see it from certain angles.
     
  3. 1Evil4re

    1Evil4re Formula Junior

    Jun 24, 2012
    313
    Nashville Area
    Full Name:
    David
    #3 1Evil4re, Mar 29, 2013
    Is it possible to take a picture or will it not show up? I have a friend who is a very competent auto glass installer.
     
  4. surfer

    surfer Rookie

    Jul 19, 2008
    26
    #4 surfer, Mar 30, 2013
    I'll try to get some photos of it this weekend and post it on Monday.
     
  5. plankeracer

    plankeracer Rookie

    Jul 6, 2011
    42
    Bergen Norway
    #5 plankeracer, Mar 30, 2013
    In stead of posting pics and worry about it, try to compare the stains to any other car there is availble for you, every rear window of any car ever prodused has temper stains. Just compare, if they look anything similar to the other car you compared with, then it is tempermarks. Its from nossels blowing air on the tempered glass to cool it to the right temperature.
     
  6. klatu

    klatu Formula Junior

    Apr 13, 2009
    277
    San Diego
    Full Name:
    Rob Mckinney
    #6 klatu, Mar 30, 2013
    Try looking at the glass through polarized sun glasses, and that will show you the tempering patterns.

    Rob
     
  7. BigTex

    BigTex Seven Time F1 World Champ
    Owner Rossa Subscribed

    Dec 6, 2002
    79,386
    Houston, Texas
    Full Name:
    Bubba
    #7 BigTex, Mar 30, 2013
    I agree I think it's 'in the glass' all along, I see them sometimes in mine, maybe the imprint of the wire rack during tempering??.....It looks like the diamonds of an expanded metal grate.....

    Drive on.....
     
  8. surfer

    surfer Rookie

    Jul 19, 2008
    26
    #8 surfer, Apr 3, 2013
    Thanks guys, I've only just noticed and couldn't figure out whether I had simply overlooked it before or whether it was new.
     

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