Duo valve test?

mercmadjim

Senior Member
Joined
Dec 19, 2008
Messages
547
Reaction score
2
Location
Cornwall
Your Mercedes
SLK230k
Is there any way to test the duo valve? I have voltage going to it, but using a multi meter, can I test the valve itself?
 

Number_Cruncher

Senior Member
Joined
Oct 10, 2007
Messages
1,806
Reaction score
3
Your Mercedes
1995 W124 E300D TE
Measure the resistance between the centre terminal and each outer terminal, and report back.
 

television

Always remembered RIP
Joined
Mar 14, 2005
Messages
164,073
Reaction score
367
Age
89
Location
Daventry
Your Mercedes
2002 SL500, 216 CL500, all fully loaded
The reading should be read on the 1k range, its unusual to have both coils O/C unless say the passenger one failed some time ago and you did not notice.

You can remove the top and see if there is a broken wire from the coils, though they often break on the inner part of the coil, a break on the outer turns is easy to repair, but not the inner
http://forums.mercedesclub.org.uk/showthread.php?t=25909
 

basamir

Senior Member
Joined
Apr 5, 2009
Messages
149
Reaction score
0
Location
Barcelona
Your Mercedes
W202 from 07/1997
I did that and got nothing..zip, nada, etc, is it broken?:(

If no resistance are between pins that means that your solenoid are broken.
You can repair them all that you need is to repect the topic linked in malcolm's reply.

I have me too problems with my duo valve but they aren't broken because the resistance between pins are the same 0.20 Ohms
 
OP
mercmadjim

mercmadjim

Senior Member
Joined
Dec 19, 2008
Messages
547
Reaction score
2
Location
Cornwall
Your Mercedes
SLK230k
  • Thread Starter
  • Thread starter
  • #6
Thank you Malcolm, any idea how much they cost? my old W124 has a good one, the pipe work is slightly different, on the SLK all 3 pipes come out on 1 side, and on the W124 there is 2 on one side and 1 on the other.
But if they are reasonably priced I will buy one.

Thank you Basamir, there is no thank you button on your post??
 
Last edited:

basamir

Senior Member
Joined
Apr 5, 2009
Messages
149
Reaction score
0
Location
Barcelona
Your Mercedes
W202 from 07/1997
Thank you Malcolm, any idea how much they cost? my old W124 has a good one, the pipe work is slightly different, on the SLK all 3 pipes come out on 1 side, and on the W124 there is 2 on one side and 1 on the other.
But if they are reasonably priced I will buy one.
I think that a new duo valve is about 100 Euros.
 

television

Always remembered RIP
Joined
Mar 14, 2005
Messages
164,073
Reaction score
367
Age
89
Location
Daventry
Your Mercedes
2002 SL500, 216 CL500, all fully loaded

Slowtack

Active Member
Joined
Mar 6, 2007
Messages
27
Reaction score
0
Had duo valve problem last year on my W124 estate.
No heat either side, solenoids ok.
My canny mechanic guru fixed it by taking out the internal rubber grommets which were swollen on one side and replacing them the oposite way around.
 

television

Always remembered RIP
Joined
Mar 14, 2005
Messages
164,073
Reaction score
367
Age
89
Location
Daventry
Your Mercedes
2002 SL500, 216 CL500, all fully loaded
Had duo valve problem last year on my W124 estate.
No heat either side, solenoids ok.
My canny mechanic guru fixed it by taking out the internal rubber grommets which were swollen on one side and replacing them the oposite way around.

Yes and a good fix :D
 

fullmeister

Senior Member
Joined
Feb 4, 2009
Messages
100
Reaction score
0
Location
Northumberland
Your Mercedes
w124 250D estate
Are the internal seals availible for rebuiling purposes ? I took mine apart to clean it and now it leaks like buggery
 

television

Always remembered RIP
Joined
Mar 14, 2005
Messages
164,073
Reaction score
367
Age
89
Location
Daventry
Your Mercedes
2002 SL500, 216 CL500, all fully loaded
They were not made to be repaired,,it is possible to make your own gaskets, and O rings can be bought in any size.

Cleanliness of the joint faces is very important. I will try and dig up a link that covers this if I can find it
 

fullmeister

Senior Member
Joined
Feb 4, 2009
Messages
100
Reaction score
0
Location
Northumberland
Your Mercedes
w124 250D estate
Cheers lads but I decided to get a scrapyard one (12 quid) , when I removed the top covers the windings were like a birds nest !

Top link though.........
 


Mercedes-Benz Servicing, repairs, engine and diagnostics
Wayne Gates - Mercedes-Benz, Unit F3, Phoenix Industrial Estate, Rosslyn Crescent, Harrow, Middlesex, HA1 2SP
Tel: 020 8863 9233
Established for 20 years all vehicles washed and vacuumed.
Top Bottom