2012 S550 and the passenger seat developed a leak in the tube connections at the “y” where main air supply comes to the seat. Two of the lines connecting leak and it is due to wear on the rubber seal and wear on the stem that connects with this seal.

The seal is not an O-ring. It is square rubber seal measuring 5mm ID, 8mm OD and is 2.2mm thick.

I have searched several Mercedes dealer parts sites but cannot find anything about the air tubing for the seats. Also no luck googling this. Perhaps I just don’t know how to search…

Does anybody here know a place where to get these connectors? Or is it dealer-only item that has been discontinued?

 

https://nemigaparts.com/cat_spares/e...71/63v/91/065/

 

THANKS!

But do you know where do I get these parts?

 

if available at the Merc parts counter.... as I pointed out in a previous post I have seven main dealerships within 20 mile radius of my house - but I go to the one 2 miles away, not the next closest 7 miles away, or the third 9 miles away, fourth 14 miles away

 

Yeah,
I have a dealer 15 miles away, next one is 62, next one 79 miles and then 86 miles away. After that it goes to hundreds of miles.
You can just guess what this does to the price level on everything from my local dealer...

I was hoping there is some internet seller as from your parts list with prices the level here is about 10-fold as I checked one dealer site.

But if the dealer is the only way to get these then that is the way I need to take...

 

With part number do Google search, ebay search, may find some made in China. Or go to junkyard?

 

I have done searches with poor results.

I will probably just use 1/4” irtigator tubing connections and 1/4” tube to replace the Y-receiver. Costs just a few dollars for a bag of many.

Just one cap connector cost $60-70 from the dealers. Hope never need one. This is I think the one that connects tubes on the control unit.

I would be happy with just couple rectangular shape O-rings. These seals can be replaced but where to get them. And they all wear and start leaking over time and there are many in this system.

 

So, did a fix to the air leak in my passenger seat. Leak was in the two right side fittings in the first picture below.

Air supply to the seat comes to the lower one, the other two go to seat controls. The upper one on right goes to a horizontal “bar” behind the control unit. This “bar” is perhaps a pressure sensor? Connection on left is air supply to the control unit.

I think the problem with this setup is that these connections are not tied to anything. They are left dangling in air hanging on the tubes and probably experience lots of vibration that then cause wear on the seals.

I have written about the air leak at the pressure reservoir safety valve before but I had replaced it already so the leak had to be somewhere else.

Found the air supply tube blown. Was able to splice in it at the side of the chair but will have to replace the whole line later as the tube material is very brittle.

To find these fittings leaking was tricky as after fixing the supply tube everything seemed to be fine but system would still not hold pressure. I could not hear any hissing sounds before I put my ear right next to the fittings.

Not able to find seals or fittings in any reasonable cost I did the repair shown in the second picture.

Parts:
-1/4” tube from AutoZone
-Bag of Orbit irrogation system elbows from Lowe’s
-Bag or Orbit Ts

Only used one elbow and one T but cannot buy individually. Well , who cares when a bag cost like $6 or so. Total parts cost less than $20.

Supply to an elbow that connects to the T. From the T straight up to the supply to control unit and to the right to that “bar” behind the unit.

For control unit supply I was able to use the original tube after cutting off the connection (still has the parts number label on the tube in picture). For the “bar” I had to replace the whole tube as the original is too short after cutting off the original connection.

So, anybody out there with malfunctioning multicontour seats do not fall in desperation. This fix was very simple and low cost after finding the problems.

For “complete” fix later I will replace the whole air supply line from connection under the seat to the elbow and then do all the same for the driver’s seat.



As built from factory shown in position it comes.

Replacement parts in place.