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Coolant leaking from the coolant tank A4 B6 1.9 TDI

Discussion in 'A4/A4 cabriolet/S4 forum(B6 chassis)' started by delc83, Dec 19, 2013.

  1. delc83
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    delc83 New Member

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    [Dec 19, 2013]
    Hi Guys
    Audi A4 B6 1.9 TDI 130, AVF, 2004
    I've noticed coolant is leaking from the hole under the coolant tank, when ive been driving, it isnt loosing much at the moment, but when I open the bottle pressure comes out and the coolant rises.
    Ive have replaced the coolant tank with a new one, still leaking.
    I've also replaced the thermostat (genuine), temp sensor, because it wasnt sitting at 90, but is now.
    Earlier this week water pump failed, so got that replaced, even though it was replaced at 115k, 7 months ago.
    It is still leaking and the coolant has gone a bit dirty, ive had the sniff test done, and it didnt show any hydro carbons, and the colour didnt change and also pressure test on the coolant bottle and pressure was fine.
    Hope its not the head gasket, my friend said it could be the oil cooler.
    Any help or guidance would be appreciated.
    #1
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  3. B5NUT
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    B5NUT Well-Known Member VCDS Map User

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    [Dec 19, 2013]
    I had the same problem and it was the HG, its one of the only ways to pressure rise the coolant system and water to be forced out of the coolant bottle, only other cause than I can think of is a cracked head.
    #2
  4. delc83
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    delc83 New Member

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    [Dec 19, 2013]
    How much did it cost?
    #3
  5. B5NUT
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    B5NUT Well-Known Member VCDS Map User

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    [Dec 19, 2013]
    #4
  6. Mollygoogle
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    Mollygoogle Member

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    [Dec 19, 2013]
    Just had the same symptoms with mine and it was the head gasket. Hopefully yours works out better than mine has so far
    #5
  7. pauldazzle
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    pauldazzle Active Member

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    [Dec 20, 2013]
    Head gasket failing.
    #6
  8. delc83
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    delc83 New Member

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    [Dec 20, 2013]
    I just dont want to get it opened and have a cracked head.
    Is £300-£400 a good price to get the HG replaced? a mechanic said sometimes injectors fail when replacing the HG, ive also been told skimming the head isnt a good idea on a PD engine, is this true?
    #7
  9. BlackQuat
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    BlackQuat Well-Known Member VCDS Map User

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    [Dec 23, 2013]
    Did you replace the cap?
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  10. delc83
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    delc83 New Member

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    [Dec 23, 2013]
    Yes i replaced it with my mates, ive noticed the pipe thats connects to the radiator goes really hard when ive been driving around. its building pressure, only way to let it out is to open the cap, and some air and more coolant comes out the hole from under the tank, and the pipe goes soft again.
    #9
  11. BakPak
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    BakPak No Gear

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    [Dec 25, 2013]
    Had very similar problem with mine, 1.9tdi 130 5 speed. After giving the coolant system a dose of K-Seal no problems since. Done approx 500 miles. Mark.
    #10

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