E-Class (W211) 2003-2009

Airmatic compressor

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Old Dec 22, 2019 | 04:11 PM
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w211 04 e220
Exclamation Airmatic compressor

Is it normal to hear airmatic compressor when parked a bit up-hill when unlocking car for 2-3 seconds,also I can hear it when driving on uneven road then when coming to a stop I can hear it running for a few seconds?I do not have any leaks in my struts.
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Old Dec 22, 2019 | 08:33 PM
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1922 Ford Model T / no OBD
The system should level the car upon activation (remote button, or door opening) but it should use air from the tank for it.
When you have no air after short stop, the compressor will start to build the pressure lost due the leak.
But that is indication you have a leak and you are killing the compressor by making it working overtime.
Not saying that leak pumps lot of condensation inside the system.
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Old Dec 23, 2019 | 04:29 AM
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w211 04 e220
So where should I start,since I had a leak in the rear struts, and my pump was running less than a month almost every day, to pump the rear struts?Could it be my pump,just dying?
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Old Dec 23, 2019 | 04:30 AM
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w211 04 e220
Originally Posted by kajtek1
The system should level the car upon activation (remote button, or door opening) but it should use air from the tank for it.
When you have no air after short stop, the compressor will start to build the pressure lost due the leak.
But that is indication you have a leak and you are killing the compressor by making it working overtime.
Not saying that leak pumps lot of condensation inside the system.

So where should I start,since I had a leak in the rear struts, and my pump was running less than a month almost every day, to pump the rear struts?Could it be my pump,just dying?
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Old Dec 23, 2019 | 04:03 PM
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1922 Ford Model T / no OBD
If you have scanner who will monitor the system pressure - use it to determinate the amount of lost air to start. That will help in determination what you are looking for.
I had air system problem in years when $150 scanners for MB did not exist, so I simply put a tee on the main line and hook up pressure gauge.
Then when I was ready to dive under the car with spray bottle, I removed the gauge and hook up shop compressor to it, to have constant pressure.
In my case it turned that I had pinhole in 4mm tubing- right under differential, that would hold 80 psi, but would open with higher pressure.
That's how tricky the system can be.
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Old Dec 23, 2019 | 04:28 PM
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w211 04 e220
Unhappy

Originally Posted by kajtek1
If you have scanner who will monitor the system pressure - use it to determinate the amount of lost air to start. That will help in determination what you are looking for.
I had air system problem in years when $150 scanners for MB did not exist, so I simply put a tee on the main line and hook up pressure gauge.
Then when I was ready to dive under the car with spray bottle, I removed the gauge and hook up shop compressor to it, to have constant pressure.
In my case it turned that I had pinhole in 4mm tubing- right under differential, that would hold 80 psi, but would open with higher pressure.
That's how tricky the system can be.
Just when I fixed one problem another one came up..hopefully this one will be less expensive
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Old Dec 26, 2019 | 10:10 PM
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2015 S550, 2005 SRT6 Crossfire, 2001 Prowler - BlackTie
Need Airmatic components

Where is the best place to purchase Airmatic components. Struts, rear airbags and compressor? I can do the work myself. Just need the parts.
Also appreciate any tips and suggestions.

Last edited by bradgrubbs; Dec 26, 2019 at 10:13 PM.
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Old Dec 28, 2019 | 10:26 AM
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1922 Ford Model T / no OBD
ebay has compressor rebuild kits for about $20. It takes some work to pull the compressor and rebuild it, while baking the drier granules, but nothing that inclined DIY can't do .
For bags lot of members buy Arnots, where airbags delete rear reservoirs. That lowers the comfort, but life is full of compromises.
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Old Jan 12, 2020 | 02:53 PM
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w211 04 e220
Quick update on this,at the end everything is ok with airmatic,the SBC pump is pressuring the system,and I thought it was the airmatic compressor all the time..Hahaha
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