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Rust colour coolant

Discussion in 'A3/S3 Forum (8L Chassis)' started by harps21k, Sep 22, 2010.

  1. harps21k
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    harps21k Member

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    [Sep 22, 2010]
    Hi guys...

    For some time my car was running on water as it kept leaking coolant.. I got this leak sorted and four that the coolant tank had turned out to be brown and rusty colour.

    I then ran some water to flush the brown rusty water out of the car. After draining it I mixed g12 ++ 50/50 with water.. After running the car with a new coolant tank the coolant seems to have started to change brown rusty colour.

    Is the any mix that will flush the whole system to remove the rusty water... Also what is the best way to flush the rusty water completely out of the system..

    Can anyone help?
    #1
  2. s3dave
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    s3dave TFSI Hybrid Supporter

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    [Sep 22, 2010]
    its because you have started the rusting process using pure water, so all the engine will have a nice coating now, you will just have to keep changing it untill it is clear or take the bottom rad hose off and try flush it out better...
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  3. gavin89
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    gavin89 Wana go Low gotta go Slow

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    [Sep 23, 2010]
    You sure its not your headgasket? Your coolant might be that colour because its mixing with oil. Have a look under the engine oil cap, if it looks like mayo then its your HG. IF not then you need a good flush with a flushing detergent.
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  4. harps21k
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    harps21k Member

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    [Sep 24, 2010]
    I have checked that it not the head gasket. The water does not contain any Mayo.. Also turmoils cap and levels are fine..
    It's just the car was running on water for a little while, which might have caused this rusty colour.. I have drained it by removing the lower tad hose.. But think I might need to keep doing it a few times?
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  5. harps21k
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    harps21k Member

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    [Sep 24, 2010]
    Oil cap I meant
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  6. harps21k
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    harps21k Member

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    [Sep 24, 2010]
    Gavin, where can I get a flushing detergent for audi's. Any particular make?
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  7. gavin89
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    gavin89 Wana go Low gotta go Slow

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    [Sep 24, 2010]
    Yeah I would go for Wynns Cooling System Flush. Its about fiver plus vat from GSF. That should solve it!
    #7
  8. Rob_B
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    Rob_B Member

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    [Sep 24, 2010]
    mate getting the brown water is take length!! i had the same problem with a mates skyline and a leon cupra R - took me ages to flush that horrible s**t out

    just need a lot of patience and a lot of water :)
    #8
  9. harps21k
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    harps21k Member

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    [Sep 24, 2010]
    Thanks guys, will try the wynns flush... I think I will need a lot of water... Need to get this done before it starts to get colder...
    #9

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