Hi, does anyone have a diagram of the S211 E-320 (T-Model / estate) rear only airmatic system they could share, searched but can only find the full (all 4 wheels) airmatic diagram.

I am suspecting the compressor is weak but would like to see a diagram to confirm I have checked all components and not missed anything.

The problem started many months ago, the car started dropping when parked overnight, it eventually started dropping to the point that the "car too low" warning would display when first starting the car. I also noticed when left with the engine running the rear height would hunt up and down slightly (maybe but not 100% certain at different levels left and right) as if it was searching for the correct level. Eventually the car started to raise only slightly (leaving about 10mm of the top of the tire under the arch) and if driven started intermittently displaying car too low when driving, it did raise slightly enough to clear the car too low error but only just.
I suspected the level sensor but replacing it made no difference.
Looking at Star the only error shown is 5501 Critical Vehicle Level, I did get 5505 Recovery Times During Filling of Air Suspension Strut is too Long shown once but it has never returned.
When performing a Compressor Pneumatic test it shows the generated pressure very low and only just registering -50 to -45 on the graphic after 20 plus seconds of the compressor running, the compressor sounds normal and there is no signs of any leaks. The car does try to raise eventually but as mentioned it only raises so far then stops.

Im suspecting the compressor may be weak due to being over run but I feel there may be further problems so a diagram will likely help.

Any advice also much appreciated.

Many Thanks

 

Here: https://mbworld.org/forums/e-class-w...ml#post8748801

 

Thanks Heguli that is exactly what I was looking for and more :-)

 

there is a leak somewhere. i doubt it is both bags at same time. i am only familiar with 4 wheel airmatic. but there is a valve block. it leaks