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how much coolant/flushing system

Discussion in 'A3/S3 Forum (8L Chassis)' started by audi18tdan, Jun 26, 2008.

  1. audi18tdan
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    audi18tdan Member

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    I lost loads of coolant when changing thermostat over and expansion tank is completely empty.
    How much coolant did i loose???

    How can i flush the system and how much coolant would i need for whole system once drained out of radiator?

    Also how much water to coolant should i use?

    Cheers
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  2. rodenal
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    rodenal Active Member

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    I think it's a 3 litre system, get 4 to be safe

    I tend to use a 50/50 mix
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  3. rodenal
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    rodenal Active Member

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    Oh and to flush system just pour water through it
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  4. audi18tdan
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    audi18tdan Member

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    cheers for that, i have got 2 1.5 ltr bottles of g12 coolant so i guess i would need to put 1 of these bottles and 1.5ltrs of water??

    Any idea about drianing system?
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  5. rodenal
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    rodenal Active Member

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    Yeah just fill the bottle back up after putting the coolant in.

    put your hand down in behind the radiator at the front of the engine bay

    The pipe which comes off your thermostat has a plastic valve type thing right at the radiator

    unscrew it the whole lot will come out

    i'd get another bottle of the coolant btw
    #5
  6. abdus
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    abdus Top Gear

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    after filling up, remove the expansion bottle cap and let the engine run. This will remove any air trapped inside :)
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  7. rodenal
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    rodenal Active Member

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    Yep good advice, as above plus give the bottom rad hose a squeeze when you're filling with the expansion cap off, helps get rid of trapped air too
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  8. HTC
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    HTC Active Member

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    I don't see the need to flush the system if you have only lost coolant.
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  9. audi18tdan
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    audi18tdan Member

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    I have decided i'm not going to flush system anyway.
    Just gonna fill up with just coolant now as water should still in RAD.
    #9

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