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Coolant leak

AVLO Dec 15, 2013

  1. AVLO

    AVLO Active Member

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    Right folks ive had an issue for a couple of weeks now in the effect that i have been losing coolant but had no leaks on to the floor, so on that note i had a block test carried out which actually changed the colour of the fluid to a green/yellow colour which i suspect to be carbon monoxide but it took quite a while to change colour (4-5 mins). But yesterday at the local ASN meet i noticed a leak that i have never noticed before so on that note i begun to look for leaks under the bonet! i managed to trace it down to a drip coming from the Coolant Thermostat Housing. So today I took off my CTS housing to look for any cracks and also checked the connecting hoses for splits but I couldn't find anything so on that footing I rebuilt back up after cleaning everything down then I ran her upto temperature and hey presto the dripping reoccurred. My question is could the coolant pressure be pushing coolant out of the hoses as they are only held on by the sprung loaded clips?
     
  2. Drewvic

    Drewvic Member

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    I forgot to mention that to yesterday I didn't know wether that patch on the floor was off yours or not
    isn't it an air leak you have hahahahahaha
     
  3. Drewvic

    Drewvic Member

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    also forgot to ask mate where did you say you took your car for mapping and tweaking was it r,tech or summat to do with a nicky??
     
  4. AVLO

    AVLO Active Member

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    Yes it was from mine and it was the first leak I have seen, Now I no it's leaking from the CTS housing somewhere that tells why the leak was so bad with that being on the lower side of the car when I was parked on that incline (all the coolant will have gone to that side and leaked out). But I don't have any air leaks, water leaks are enough :(
     
  5. AVLO

    AVLO Active Member

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    Yes mate it was r-tech in hinckley, Leicestershire.
     
  6. Drewvic

    Drewvic Member

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    cool thanks for that mate
    that's a strange one then if there is no leak, is the a gasket on the cts??
     
  7. Drewvic

    Drewvic Member

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    also might be asking for a little help regardin those pipes you were on about in my post mate,
     
  8. AVLO

    AVLO Active Member

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    Not the gasket as its not coming from the lower part of the housing :/
     
  9. AVLO

    AVLO Active Member

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    Best bet might be to do as the above say because they are more experienced than I then if that doesn't work we can look at the Pcv/boost hoses.
     
  10. Drewvic

    Drewvic Member

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    cool cool mate will be doing maf test in abit when roads are bit quieter,
    that's gona a pain for you to find then mate and resolve
    hope you get sorted soon mate
     
  11. AVLO

    AVLO Active Member

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    [​IMG]

    this is where the coolant is coming from, the red ring being the main part if left a while but its wet in the yellow ring area straight after being wiped dry with a cloth
     
  12. Nilz

    Nilz Defo worth the wait :) Team Ibis TFSI Owners Group quattro Audi A4 S-line owners group saloon Manual

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    Hi mate, i had this on mine recently, they can have a hairline crack in them and its a common fault on our cars, I had the same and you could barely see it!!

    Replaced and all sorted.
     
    scotty_24 and AVLO like this.
  13. s3dave

    s3dave TFSI Hybrid Supporter

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    As above they split on the casting line and very hard to spot, not to bad from Audi , oh and your thermostat lives next to the alternator not in this..
     
  14. IanPG

    IanPG Well-Known Member Team Nogaro Blue Silver Supporter Audi S3

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    Hi all. I know this is an old old thread but I feel my problem is the same but I would just like to see if I can get confirmation?

    Is this part pictured. The same as the one tust is circled up in the previous post???

    image.jpg
    its located on the LHS (near air box) of the car. As you can see its a little leaky leaky.

    What's this part called so I can source one? Thanks people!
     
  15. Yeah same part - coolant flange, just recently replaced mine. 06A 121 132 AP
     
    IanPG likes this.
  16. Have a good look at it - yours might just need a new o-ring for the coolant temp sensor (Green thing), although cheap enough to replace both.
     
    IanPG likes this.
  17. Jeriho

    Jeriho Insane and i love it

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    Had a leak there just a month ago new o-ring didnt help at all. Ended up wraping teflon tape round it the kind that plumbers use. That sorted it out for now.
     
  18. IanPG

    IanPG Well-Known Member Team Nogaro Blue Silver Supporter Audi S3

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    so what size O-ring does it need?

     
  19. daithi23

    daithi23 Active Member

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    I've a horrible feeling I'll need one of these too. I'm just praying it's not the long metal pipe I need to replace too as I hear they are about £100
     
  20. IanPG

    IanPG Well-Known Member Team Nogaro Blue Silver Supporter Audi S3

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    I'll be tackling this soon so will add a write up for future reference

    Anyone know how to best clean up the orangey stuff that's made a track?
     
  21. Vex182

    Vex182 Guess what I drive...

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    I changed this part on my car yesterday, I laid a bin bag over the gearbox to stop any coolant going on anything and then fitted the new plastic pipe and a new seal and clip for the temp sensor. That's my leak all sorted now. I used carb cleaner to get rid of the mess.
     
    IanPG likes this.
  22. scotty_24

    scotty_24 Well-Known Member

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    Ive just had this as well, coolant flange leaking and the pipe under it that connects to the metal pipe was split.
    These cars are getting old now, things are going to perish! The good thing is, that coolant flange is only about £10 from TPS / Audi
     

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