Airmatic problem - Page 5 - Mercedes-Benz Forum
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#41 (permalink) Old 10-30-2012, 07:41 AM
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i have been battling with the airmatic of my R350 for a while now, first i have to change the left rear airmatic together with the shocks, next i noticed the vehicle is abnormally low, checked with the mechanic and he suggested the pump (compressor) may be bad, we changed that and everything seems to be normal. Right now the rear right is riduculosly low; am wondering if changing the rear right airmatic would solve the problem permanently?
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#42 (permalink) Old 11-20-2012, 09:31 AM
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Airmatic Issues - been there, done that.

The thread reads like a familiar story.....
Airmatic leaks in struts do occur and can be observed with those funny condition such as, one morning when it was cold the car was low in the right rear, but then leveled after I started the car.

Then it happens at the wrong time, or too often and a valve, compressor get replaced. The next time, if the mechanic can not find a leak but deceides to replace a airmatic strut - the problem stops. This is cetainly not the type of issue when I would say "replace all the struts just in case".

I think leaks in the strut can be increased & reduced by conditions of temperature and position. Only after I replaced the correct strut did I see the problem go away. To bad there is not a better way to expose the defective part. I wonder if STAR Diagnostics can "exorcise the parts to show the issue" somehow?

Airmatic has such a great ride and we all know the gremlins that can hide in the parts.

DB
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#43 (permalink) Old 05-02-2013, 08:11 AM
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Originally Posted by stevosteve View Post
Had my local garage changed two Arnott structs for me. After $3000, and a month later, with a new pump, a new valve, and two refurbushed front structs, the car can finally hold up.
Steve I am a new member and I wish I saw this thread earlier, but it was always your struts. I am surprised the dealership didn't figure that out. They should have put on your struts and charged you for at least trying that option. I would've given you an option of putting those on to rectify the problem. When the air compressor reaches a certain PSI an auto leveling sensor stops it. Overnight the air is supposed to hold and if it kept deflating overnight, it would've been obvious that the suspension bag has a pinhole leak. Ask yourself, WHERE IS THE AIR ESCAPING TO. IT HAS TO GO SOMEWHERE.
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#44 (permalink) Old 05-23-2013, 07:59 AM
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Hi,

I'm having the front dropping on my 2008 R320 CDI Airmatic every now and then...

Sometimes the car can hold up for days, sometimes the front drops just after 5 hours.

Done the soap & water test on struts, valve box, compressor...nothing...no hiss sound from air escaping, no bubbles...

Compressor works fine..After I start the car, it rises without any problem...

I'm inclined to think it's the valve unit (2 leaking selenoid valves?), because I don't believe both front air bags can fail at the same time...but I could be wrong....

Any clues???
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#45 (permalink) Old 05-23-2013, 08:04 AM
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Originally Posted by bertone View Post
Hi,

I'm having the front dropping on my 2008 R320 CDI Airmatic every now and then...

Sometimes the car can hold up for days, sometimes the front drops just after 5 hours.

Done the soap & water test on struts, valve box, compressor...nothing...no hiss sound from air escaping, no bubbles...

Compressor works fine..After I start the car, it rises without any problem...

I'm inclined to think it's the valve unit (2 leaking selenoid valves?), because I don't believe both front air bags can fail at the same time...but I could be wrong....

Any clues???
Your thinking is logical and if the front drops evenly on both sides I would suspect the valve block straight away. Both struts leaking at the same time and pace? No I do not think so.

ERIC.

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#46 (permalink) Old 05-23-2013, 08:14 AM
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Eric's right

Quote:
Originally Posted by bertone View Post
Hi,

I'm having the front dropping on my 2008 R320 CDI Airmatic every now and then...

Sometimes the car can hold up for days, sometimes the front drops just after 5 hours.

Done the soap & water test on struts, valve box, compressor...nothing...no hiss sound from air escaping, no bubbles...

Compressor works fine..After I start the car, it rises without any problem...

I'm inclined to think it's the valve unit (2 leaking selenoid valves?), because I don't believe both front air bags can fail at the same time...but I could be wrong....

Any clues???
Eric is right and your logic is on point.
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#47 (permalink) Old 05-23-2013, 08:19 AM
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Originally Posted by Cursealoud View Post
Eric is right and your logic is on point.
Yes his logic is on point but I would ask one question here, when the front drops, how is the back standing? ie both sides too high, or one side high and one side low?

ERIC.

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#48 (permalink) Old 05-23-2013, 08:21 AM
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Thanks guys for your quick help!

Both front wheels drops. Both rear wheels keep up (no change in height).

What I do not understand is:
since there is obviously some component(s) that leaks (either strout or valve unit, etc); why does it not leak every time??????

Last edited by bertone; 05-23-2013 at 08:26 AM.
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#49 (permalink) Old 05-23-2013, 08:24 AM
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Quote:
Originally Posted by bertone View Post
Thanks guys for your quick help!

What I do not understand is:
since there is obviously some component(s) that leaks (either strout or valve unit, etc); why does it not leak every time??????
Simple mechanics, sticky valve - sometimes it does not close properly.

ERIC.

___________________________________________
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- George Bernard Shaw to Winston Churchill.

"Cannot possibly attend first night, will attend second ... if there is one."
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#50 (permalink) Old 05-23-2013, 08:30 AM
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Quote:
Originally Posted by eric242340 View Post
Simple mechanics, sticky valve - sometimes it does not close properly.
Ok, but then it would drop down slowly just when I turn off the car and it goes into "sleep mode"....But what action/cause triggers the drop after several hours?? Strange....
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