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Draining coolant and refilling, How to?

willh92 Jan 23, 2014

  1. willh92

    willh92 Active Member Audi S1 Team Brilliant Black

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    I'm looking to drain the coolant out of my '99 S3.
    How would I go about doing so, anyone got a step by step? Likewise for refilling?

    or what is the best point to drain it out from?

    cheers

    will
     
  2. s3dave

    s3dave TFSI Hybrid Supporter

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    There is a drain valve at the bottom of the radiator, fill slowly with heaters on hot and full squeezing bottom rad pipes as you go..
     
  3. <tuffty/>

    <tuffty/> Badger 5 Edition...Its all about the flow... Staff Member Moderator Audi S3

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  4. willh92

    willh92 Active Member Audi S1 Team Brilliant Black

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    Cheers tuffty, good guide there.
    How do you bleed the system?

    Also, does refilling the system from the header tank fill the radiators up if the drain point is on the rad? Cos on some things I've had to fill the rad first then from the tank.
     
  5. Wallm0nkey

    Wallm0nkey Member

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    I had no problem refilling from the header tank just kept the heaters on and squeezing the pipes.
     
  6. <tuffty/>

    <tuffty/> Badger 5 Edition...Its all about the flow... Staff Member Moderator Audi S3

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    When doing rods and head swaps etc on 20v's I normally drain from the rad tap then drain out the back of the block...

    Use new OE banjo sealing washers for the turbo line once drained and then fill through the expansion bottle...

    Once the level in the tank has reached the point its not draining down I normally leave the engine idling for a while with the expansion tank cap removed topping up as required......

    Be aware the coolant level will rise a bit as the temp increases but you need to get to a point that the stat opens to ensure the system is filling

    <tuffty/>
     
  7. JD09

    JD09 I'm not modding, I'm improving VCDS Map User

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    Is that in the stickies, Paul? As might be an idea to add if not :)
     
  8. Andrew@A.L.D

    Andrew@A.L.D May add NOS to 600+bhp S3.

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    this is what he means

    http://www.audi-sport.net/vb/a3-s3-...y-check-when-its-cold-warning-skin-burns.html
     
  9. <tuffty/>

    <tuffty/> Badger 5 Edition...Its all about the flow... Staff Member Moderator Audi S3

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    Good point... this is what happens if you are not 'paying attention' (shall we say :))

    Never had an issue like this running the engine with the cap off BUT.... you can't leave it... I always keep an eye on it and NEVER undo a cap on a hot engine... let the engine cool down a bit first then slowly undo the cap to release the pressure whilst keeping an eye on the level in the expansion tank... if it rises as you undo then tighten back a turn or two and move away....

    Its a bit like undo a pop bottle thats been shaken only coolant WILL strip your skin... (as demonstrated by the lovely Andrew)...

    Not a good place to be (hope its healing ok mate)

    <tuffty/>
     
  10. Andrew@A.L.D

    Andrew@A.L.D May add NOS to 600+bhp S3.

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    Yes unexpected air lock in the coolant system and rushing was my fault that i was injured
     
  11. s33nyboy12

    s33nyboy12 Well-Known Member

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    This is my how too!

    LEGEN..............Wait for it ..........DARY

    Sean
     

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