1. This site uses cookies. By continuing to use this site, you are agreeing to our use of cookies. Learn More.

Quick connect heater matrix hose

Discussion in 'A4/S4 forum(B5 Chassis)' started by NineNails, Nov 9, 2012.

  1. NineNails
    Offline

    NineNails Proud sponsor of the snack food industry

    Joined:
    Sep 18, 2006
    Messages:
    583
    Likes Received:
    3
    The one that connects to the plastic flange pipe at back of head.
    Does anyone know the size of the sealing o ring just inside the pipe?
    Getting desperate to stop it leaking and can't get to the dealers for one
    Cheers :)
    #1
  2. NineNails
    Offline

    NineNails Proud sponsor of the snack food industry

    Joined:
    Sep 18, 2006
    Messages:
    583
    Likes Received:
    3
    Also, is there supposed to be anything else inside that connection? It seems a bit not right that all that seals the connector is an o ring on the pipe spiggot. I've not lost a rubber washer out of there or something have I?
    #2
  3. B5 BIKER
    Offline

    B5 BIKER Member

    Joined:
    Jul 24, 2011
    Messages:
    241
    Likes Received:
    15
    no, all that is in there is the o-ring.
    mine was leaking and when i opened it a few weeks ago the ring came out in 6 pieces.
    dont know how it wasnt washed away.
    i just got 10 different o-rings from a local auto factors for the princely sum of 2 euro.
    used the one that i thought fitted best inside the pipe - no leaks now.
    #3
  4. aragorn
    Online

    aragorn "Stick a V8 in it!" Staff Member Moderator

    Joined:
    Jan 30, 2008
    Messages:
    15,518
    Likes Received:
    300
    Audi dont sell the seal sepreately either and theres nothing in ETKA.

    You sure its not a cracked flange?
    #4
  5. NineNails
    Offline

    NineNails Proud sponsor of the snack food industry

    Joined:
    Sep 18, 2006
    Messages:
    583
    Likes Received:
    3
    Thanks for the input lads.
    I'm hoping the flange is not cracked Kev but it's kind of hard to have a good look back there. I want to try the easy things first :) The coolant is dripping off the bottom of the hose so I thought I'd try an o ring in there. I have a new cts to fit too so that will rule out that o ring. If it still leaks then it's gotta be the flange. Looks a tw*t of a job so wanted to avoid if possible mate
    #5
  6. Bradderz_1988
    Offline

    Bradderz_1988 Dont replace it, Upgrade it !!

    Joined:
    Aug 19, 2010
    Messages:
    3,171
    Likes Received:
    100
    My housing had a hair line crack on it just at the bottom of the bend.

    [​IMG]

    if you look at this pic were the bottom 10mm is if you look to the left of it and up abit you can see a circle just slightly from when its been molded mine was leaking there.
    #6
  7. aragorn
    Online

    aragorn "Stick a V8 in it!" Staff Member Moderator

    Joined:
    Jan 30, 2008
    Messages:
    15,518
    Likes Received:
    300
    mine was cracked underneath too.
    #7
  8. NineNails
    Offline

    NineNails Proud sponsor of the snack food industry

    Joined:
    Sep 18, 2006
    Messages:
    583
    Likes Received:
    3
    What's the flange like to change then, much pain?
    #8
  9. aragorn
    Online

    aragorn "Stick a V8 in it!" Staff Member Moderator

    Joined:
    Jan 30, 2008
    Messages:
    15,518
    Likes Received:
    300
    I did mine with the engine out, but tbh its only two bolts so i cant see it being too difficult?
    #9
  10. Bradderz_1988
    Offline

    Bradderz_1988 Dont replace it, Upgrade it !!

    Joined:
    Aug 19, 2010
    Messages:
    3,171
    Likes Received:
    100
    Piece of piss two bolts and slides off the pipe just dont drop one of the bolts on to the gearbox couldnt find it at all so got a bolt and washer bleed it up and then spotted it while checking for any leaks and threw it back in OCD i no lol when you get a new one you will need a new bung and clip i also changed my temp sensor to the green instead of blue. I also change the header tank so it was fresh and pink :)
    #10
  11. NineNails
    Offline

    NineNails Proud sponsor of the snack food industry

    Joined:
    Sep 18, 2006
    Messages:
    583
    Likes Received:
    3
    Changed o ring and still leaking :(
    I have a new flange but it has two sensor ports. No problem I thought. I can use the old cts as a bung in the spare port. Pulled clip out of cts and promptly lost it down the back somewhere, so can't do it now untill next weekend when I can get time and a new clip.
    Another problem is I have the wrong cts. I recieved a blue 4 pin square cts. My cts is black and a D shape 4 pin. I can only see green ones for sale, is this ok??
    Last edited: Nov 10, 2012
    #11
  12. aragorn
    Online

    aragorn "Stick a V8 in it!" Staff Member Moderator

    Joined:
    Jan 30, 2008
    Messages:
    15,518
    Likes Received:
    300
    All new ones are green.

    Only buy Genuine CTS from the dealer (or TPS) the saving isnt worth the hassle if it then starts acting odd.
    #12
  13. NineNails
    Offline

    NineNails Proud sponsor of the snack food industry

    Joined:
    Sep 18, 2006
    Messages:
    583
    Likes Received:
    3
    Just to update: All fixed :)
    Wasn't too bad to do, with minimal damage to arms. There is a moulding seam along the pipe and that's where mine had been leaking. I'd also got some better, slightly fatter 'O' rings for the heater hose and a proper blanking plug for the spare port. I had to buy 10 'O' rings so if anyone wants one just PM me.
    For the search engines out there... Heater pipe o ring size for a good tight fit is 21mm ID x 4mm cross section
    Thanks for all the help as ever lads :)
    Si.
    #13

Share This Page