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  1. Coolant leak AWX 
    #1
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    Hi
    A6 avant 02 350000kms
    I fixed a coolant leak on the back of the head around 3 to 5 months ago
    Replacing both the coolant flange and other smaller gasket,replaced with genuine audi seals,My coolant flange is of the alloy type

    Could this be leaking again already or is there anything else back there that could be leaking coolant
    Its so hard to see anything back there,
    Its running down the back of the sump and dripping of the sump,directly in the centre

    Any help much appriciated
     
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  2. Re: Coolant leak AWX 
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    As you will know having done this;

    The ali coolant flange fits to the back of the head and then fitted to the flange is the heater matrix flow pipe. You have done those.

    There is also a coolant vent pipe that runs from one side to the other and rounnd the back of the head just below the tandem pump, they can chaff or breakdown and leak.

    Also double check the coolant temp sensor for watertightness.

    A horrible area of these engines to work on !
     
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  3. Re: Coolant leak AWX 
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    Thanks for the reply col
    Is it an easy job to replace the vent pipe?
    Are they expensive do you know?

    Temp sensor is tight and no leaks.
    Job was a pig the last time to get seals done,will I have to remove intercooler piping and few other bits around it?

    It's only a slight leak but I am sure it will get worse

    Thanks for feedback
     
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  4. Re: Coolant leak AWX 
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    I bought a vent pipe for mine about 18 months ago and recall it being about £15 thinking it was the cause of the leak I had, it wasn't.

    Instead it was the flange 'o' ring, which as you well know is a **** of a job.

    [edit]

    The vent pipe can be removed without any major dismantling.
     
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  5. Re: Coolant leak AWX 
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    Thanks col

    Will have a proper look if i can 2moro,Only seems to leak after the long motorway spins which i mainly do
    Do you think i should just replace it anyway even if i dont notice anything?
    Wont do any harm for that price
     
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  6. Re: Coolant leak AWX 
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    Checked the best i could behind the block
    Does not seem to be the vent pipe leaking,I seen the diesel can leak onto to the rubber but its not doing that,i raised the ducting slighty with a few washers to stop it fraying the diesel line
    Seems to be weeping again from the ali flange seal on the back of the head
    Cant believe the seal has failed again already
    Was a genuine Audi seal from the dealer

    Will keep an eye on it anyway,thoughts of doing the job again
     
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