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Silica bag removed

vw754 Nov 6, 2020

  1. ScottishA4B9

    ScottishA4B9 Registered User

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    @CanadaA3wales I stuck my pen in there and rummaged it around the tank and definitely couldn’t feel anything in there.
     
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  3. CanadaA3wales

    CanadaA3wales Canadian living in South Wales - Audi A3 8V 150BHP

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    It may be a unit that either does not have the bag in it, it may have already been removed or some units have the bags built in, so you will need to buy a new tank, they are only about 25.00
    If you look on the sides you would be able to see it, its quite big.
     
  4. ScottishA4B9

    ScottishA4B9 Registered User

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    If it had it built in, would I be able to see it? The car was owned by someone who worked for a VAG specialist before me.
     
  5. CanadaA3wales

    CanadaA3wales Canadian living in South Wales - Audi A3 8V 150BHP

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    You have a unit that has been identified as having a bag, you can tell by the name of the tank.

    If its a contained bag you will see 2 walls on your tank.

    Mine is just a normal tank with the bag on the side which was in a little plastic holder, but you can still get to it.

    The other ones have a double wall, you will see a outer wall and inner wall, those ones need to be replaced as the bag is inbetween the walls of the tank and cannot be removed.

    If yours is a single wall and there is 100% no bag then the owner probably realised the issue and removed it himself.
     
  6. CanadaA3wales

    CanadaA3wales Canadian living in South Wales - Audi A3 8V 150BHP

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    Why did the whole coolant system need work?
    Maybe the bag broke and he had to flush the system, who knows.
     
  7. ScottishA4B9

    ScottishA4B9 Registered User

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    There seems to be a very small separate chamber behind the prongs. Would this be the inner wall you were talking about?
     
  8. CanadaA3wales

    CanadaA3wales Canadian living in South Wales - Audi A3 8V 150BHP

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    I have not personally seen the dual wall tanks as mine was a single wall and you could see the bag sitting against the wall in its own little housing.

    Beside the prongs is where my bag was.

    I am thinking that the previous owner has removed the bag already, but obviously cannot be sure.

    You will be able to tell if its a single or dual wall as there would be space between the walls.
     
    ScottishA4B9 likes this.
  9. ScottishA4B9

    ScottishA4B9 Registered User

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    I think it’s been removed then. I will check closer in daylight to be sure.
     
  10. CanadaA3wales

    CanadaA3wales Canadian living in South Wales - Audi A3 8V 150BHP

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    Yeah I would think so if he was a VAG tech as he would be well aware of the potential dangers of it bursting, or it did burst and thats why all the coolant work was done on your invoice.
    You will 100% be able to tell if its a 3mm plastic wall, or much thicker dual wall.
    Also you should still be able to see it through the plastic as the bag is a lot darker pink than the rest of the liquid.
    Daytime would be best.
     
    ScottishA4B9 likes this.
  11. Bigjase88

    Bigjase88 Registered User

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    I think that is just a leaky rad thats been fixed

    i said it looked suspect as a burst silica bag for some reason turns tbe coolant in the expansion tank a horrible brown colour which then stains the reservoir. The reservoir should be nice and clear plastic
     
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  13. craigpanthercrystal

    craigpanthercrystal Registered User

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    What letter is at the end of your tank part number? Mine was original 2013 A I think and it had a double wall. Couldn't see the bag without smashing g the bottle. The latest version is M and there are wma few revisions.
     

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