Duo valve strip down

[Griffo]

Someone put a step by step strip down of a duo valve with excellent photos (was it Parrot of Doom?) and I can't find it. Can anyone direct me to it please?

I am having continuing heater problems on my W210 (E320 CDI) and I have stripped the top of my duo valve (again!) to try to find the fault. One thing I have found is that one of the 'mushroom-shaped' valves has a silicone sleeve on the stem and the othe doesn't. The effect of this sleeve is to hold the valve stem reasonably firmly in the sprung plunger tube (please excuse my terminology!) and, I suspect, stops water getting into the top where the coils are.

Can anyone confirm this please?

 

[C220GJS]

It's in the DIY section;http://forums.mercedesclub.org.uk/showthread.php?t=25909 .

 

[Blobcat]

^ - He's not wrong

 

[Griffo]

thansk to both for the replies. Having looked again at the photos and read the text, it rather looks as though there is no sleeve on the valve stems - hence the warning about them possibly falling out.

Could it be that the silicone sleeves (which is closed at the top end but allows the valve stem into the bottom end) should be up inside the sprung tubes that the valve stems go into?