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coolant / water leak - pipe to block

Discussion in 'A4/S4 forum(B5 Chassis)' started by TeKnodriver, Jul 24, 2011.

  1. TeKnodriver
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    TeKnodriver Biodiesel Purrrr

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    [Jul 24, 2011]
    got a coolant leak from where plastic flange / pipe with blue temp sensor meets the block -
    pipe is part 028 121 132

    trying to post pics - bit of rust colour around it as previous owner had been topping up water no coolant!

    I have replaced the sealing washer / O-ring 037 121 687 [original dealer part],
    but water still drips out, even without pressure from running it...

    so - should I try another O-ring from another supplier or do the plastic flanges warp over time?
    or, if the flange is warped could I sand/file the edges where the bolts pass though to allow the O-ring to seat onto the head better?

    that ammount of water getting through looks too much for K-seal but may be wrong

    [1998 TDi AFN 160k on the clock]
    #1
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  3. aragorn
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    aragorn "Stick a V8 in it!" Staff Member Moderator VCDS Map User

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    [Jul 24, 2011]
    The plastic flanges sometimes crack, or it could be the oring between the flange and the metal coolant rail?
    #2
  4. TeKnodriver
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    TeKnodriver Biodiesel Purrrr

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    [Jul 24, 2011]
    hi mate, thanks for help again!
    trying not ot make a habit of it but been having too much randon trouble on this engine -
    new car - don't know why I sold my AHU engined TDi...

    anyway - took off the flange and there's a hairline crack inside where the top metal guide for bolt hole is - damn!

    I've seen 3rd party part for £8, dread to think what the dealer will want...
    any recomendations for where to source one?

    Thanks!
    #3
  5. aragorn
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    aragorn "Stick a V8 in it!" Staff Member Moderator VCDS Map User

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    [Jul 24, 2011]
    If its the one on the side of the block, its 12quid or thereabouts from Audi.
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