Mercedes E55 W211 AirMatic Valve Block & Compressor DIY Replacement 

I think every 15-20 minutes is perfectly normal - mine goes off even every 4-5 minutes as the car goes over bumps and undulations. The main symptom for mine was when I scanned it the scanner said "Reservoir taking too long to fill" - which made me think the compressor wasn't working hard enough or air was escaping when filling. Now my airmatic 2/3 months later has NO codes - so I think the simple compressor refresh replacing the piston ring fixed it :) Another symptom which was random was the computer scanner would say that one of the accelleration sensors on the shock towers was giving a bad reading - so I replaced it but nothing improved, some online things said the valve block was faulty- It doesn't at all make sense really but I replaced the valve block and now thats stopped happening. I was getting 'Airmatic visit workshop' errors every few days. Had none since (touch wood). Hope this helps

Hello! That’s awesome :) …. OK so it sounds like the strut is leaking, where is the hissing sound coming from? And is it the back corner or front corner sagging? If it’s where the wheel sags then yep it’ll be the airbag. It won’t be the compressor. 😊

@@thatmatty231guy ah ok. The hissing sound is coming from the front driver's side wheel arch, so yeah I think it's the strut itself and nothing to d with compressor/valve body. I bought the Arnot As2300/1 remanufacured units here in the US for $528 US/ea. Hopefully Auckland gets out of lockdown soon!

@@supercricketfanatic The drive side arch (LHD US cars) is where the actually valve block is located too - so that makes in a bit tricky - if its that front left side sagging down, it COULD be then the connection to the strut from the valve block. If you just take that front wheel off and peel back the inner lining you'll see the valve block with clear hoses going to it, you could spray some soapy water on it :) And yes hopefully we do soon! Bit hard working from home with cars needing attention - (and) more importantly trying to stay focused working :)

@@thatmatty231guy ahh didn't realize they were also located on the LHS. Since I haven't got time to diagnose it this week, I'll probably just give it to a nearby mechanic and see what they say. Although I can distinguish an audible hiss near the wheel vs the compressor pump closer to the front bumper area. That's why I suspect it's the strut itself.

@@supercricketfanatic Yea most likely will be - hopefully they can help sort it :) Just get it done this week (sooner rather than later) so your compressor doesn't burn out from running constantly. Cheers!

Hmmm you probably can mate because I added pressure into the airmatic with the engine off and depressurised it however it’ll probably take a while. Not 100% sure but that may work - howd the motor blow on it?

@@thatmatty231guy Thank you very much l purchased the car with the blown engine

Hi Luke, yeah that to me sounds like a valve block issue - it has the pressure sensor built into it so that could be faulty itself. So yep replace that and it should work fine. Especially if you've done the compressor already.

@@thatmatty231guy will update tomorrow after i change the valve block. Hopefully I do not have a line leak somewhere. Do not really want to have to find a leak somewhere

@@thatmatty231guy no luck with the valve block. Suspension feels fine while driving no issues, compressor works, new valve block. Still have visit workshop message. Any ideas? going to check the electrical connectors tomorrow on the rear struts

@@lukerobertswr5189 Be good to scan and see what it is - perhaps its one of the ride height sensors or something? But yes check the top connectors AND the ADS connectors are hooked up too.

Its a Foxwell NT530 I believe.

I think it has a 30 second failsafe from memory. So there is something possibly leaking / loosing pressure … does the car sag down or anything? Could be a small leak between the pump and the valve block or valve block and pressure reservoir. Otherwise if the car sags then it’s likely a airbag leak or leak in connection to that airbag.

@@thatmatty231guy the car sags on all four, I’ll check for leaks and see what I come up with

@@tommietaylor2668 ok I’d say in that case could be your valve block then, maybe a partially stuck open valve - they can corrode over the yeads

did u fix it? be cause now i have that problem and i don't know what is the problem! i just Checked all thing and there was nothing leaking! the pump is turn on for 15 sec then its shut off

@@AS.MA_ on mine I believe the rear bags have a hole in them. If the bags are leaking badly, the pump automatically shuts off to avoid burning up