Hi,

I took the compressor out today, and noticed, that one line is broken, and has been attempted to repair by previous owner. As I understand it's pressure relief pipe, so I shouldn't worry about it?

 

For whatever it's worth, Arnott makes a compressor for the W220 that sells on Amazon for under $310. I have one on my 2005 S500 4MATIC. I also have Arnott front Airmatic struts. The main problem I experienced was a problem with the valve block. Front right was sitting low. Swapped the lines between front left and right and the problem moved to the left. Replaced the valve block and problem solved. I see there are plastic China-made valve bodies for around $100. I didn't get one of those. I got the MB valve body. There's only so many parts in the system: Compressor, lines, air tank, valve block, airmatic struts, level sensors. . . Once you get it working you may need a scantool or a shop with a scantool to calibrate everything.

 

So I took apart compressor, and what I've found out is that pressure hose was previously butchered in place. I see that, I could by only hose for like 9Eur, but the problem is that factory connections where this hose has to be fitted is permanently damaged. The hole in the second photo was completely clogged, so I had to drill it out.

 

Hi,
so I have fixed pressure hose with epoxy, at the same time cleaned all compressor and changed ring on the piston.
Put it back to car, compressor engaged, and pumped up car. Later that day I drove like 15km and it didn't engaged once, but car didn't sank either.
Next day I drove like 50km, and compressor engages quite frequently, like sometimes every 5 minutes, that 30 minutes doesn't.
BUT, car is not sinking, and no airmatic malfunction, so it seems to be fixed.