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W210 duo valve quick bodge fix

Discussion in 'Electrics, Vacuum, Ignition and ECU' started by Smaltze, Jun 5, 2017.

  1. Smaltze

    Smaltze Senior Member

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    Joined:
    Aug 13, 2015
    Location:
    london
    Your Mercedes:
    E320 S210 2002
    Hi all,

    My duo valve has failed, it only blows hot. The umbrella things have broken and one is lost. I believe that the source of the problem though don't know for sure.

    I am taking the car abroad in a couple of days (yes I know it was silly to leave it until
    until now but I've been too busy!)

    I can leave a proper fix until I am home but for now is there a bodge or fix I can do to make it blow cold. The AC is definitely charged.

    I have read somewhere that you can clamp the hot coolant inlet pipe, is this possible? That would be ideal.

    20170605_120720.jpg

    Which pipe/pipes is it?
     
  2. chardF

    chardF Senior Member

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    Joined:
    Aug 25, 2013
    Location:
    Warwickshire
    Your Mercedes:
    SL 1994 320 R129
    Rather than clamp the hose @ the duo valve, I'd clamp the one coming from the head. (probably more space)

    Other bodges, whip the top off the duo valve and wedge the plungers down with something.
     
  3. bob 6600

    bob 6600 Senior Member

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    Your Mercedes:
    Audi S8 V10, S210 E320 CDI (R.I.P.)
    Best bodge - hit the top with a smaller hammer, see if it frees it up inside.

    If you posted this last week, you could have had my old one before it went to the tip!
     
    mercedes13156 likes this.
  4. mercedes13156

    mercedes13156 Senior Member

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    West Lothian
    Your Mercedes:
    CLK 200 Cabrio and a Ford Kuga
    A smaller hammer than what?
     
  5. bob 6600

    bob 6600 Senior Member

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    Your Mercedes:
    Audi S8 V10, S210 E320 CDI (R.I.P.)
    Sorry I meant small hammer
     
    mercedes13156 likes this.
  6. OP
    Smaltze

    Smaltze Senior Member

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    Joined:
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    Location:
    london
    Your Mercedes:
    E320 S210 2002
    I ended up just making some new plungers on the lathe since it would take me just as long to bodge it.

    I made them out of brass, it has worked perfectly. Nice hot and cold all working fine.

    Here's the measurements for anyone who wants to DIY also. The thin shaft bit doesn't have to be 15mm exactly I just made it that. Most important part is that the end part is atleast 2mm deep before it angles down 45 degrees. Hope this helps someone!

    20170607_175604.jpg
     
    bob 6600 and chardF like this.

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