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Discussion Starter #1
Hi everybody, newbie here!

I am a Brit living in Poland and have recently bought a 2007 V10... very nice!

I had some problems with Running Gear Fault Stop messages so I took it to the local VW place.

About £1600 later I got it back, the main things replaced were 0AD341601C Transfer box motor and 7L6616403B Air Spring.

All was well until it got really cold - that's about -29c here - the Running Gear Fault Stop message came up again so I went back to the garage.

They appeared to agree with my diagnosis of moisture in the air suspension system as it would not lower at all, they kept the car for a couple of days and once it warmed up the suspension was OK, when I asked if it could happen again the answer was 'probably' and when asked if they could fix it was told that the air suspension was a sealed system and no.

So I looked at the invoice and saw that an air spring had been replaced.

Can anybody please confirm or otherwise that to replace the air spring you have to completely de-pressurise the system, and the moist air introduced on re-pressurisation is the problem, and any ideas what to do about it?

I have read that there is an air dryer which should not need replacing, has anybody else had any problems?

Thanks

Andy.​
 

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I've wondered about this myself. I've owned trucks with custom air suspension and all the systems have had water traps that we would drain. I would how these systems maintain themselves.
 

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Discussion Starter #4
SSP_302

Yes, I already had that.

I am wondering if I am the only person who has ever had a problem like this as I am usually jinxed...

Andy.
 

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You're not the only one. I'm experiencing exactly the same problem, except that no work has been done on the suspension. However I don't know the solution.

I came across a post on a german site. This guy seemed to be having trouble lowering the rear struts only as far as I recall (and my german is not very good). But still because of freezing weather. He fixed his problem by changing what I think was the residual pressure retaining valve on both struts.

If I can find the post again, I'll post a link here, maybe someone with better german skills can help out.

I'm having lowering troubles in all four corners when it freezes, is your problem the same?

--
Loengard
 

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hey guys,
i live in gibraltar in the south of spain and i havnt got problems with extreme cold but just the other day i was drivin my V10 and all of the sudden the filter dryer on the air suspension compressor blew , any1 experienced this b4 or any ideas on why this would happen ? im a bit suprised since the vehicle only has 35000km on the clock!
 

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There is a moisture trap in the air suspension system,relatively small capacity ,system shouldn't be used for tire inflation unless necessary,Marty
 

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Discussion Starter #9
Hi Loengard

Yes, problem is that you can raise the car but not lower it until something has defrosted.

If you look at the SSP_302 document referred to above it states that the gel dryer regenerates when the air is let out of the system. All I can think is that the air was let out another way when the air spring was replaced and the gel cartridge is not absorbing any more moisture.

Of course getting any sense out of the VW garage is a bit of a waste of time...

I did email VW Germany but it seems they can't be bothered to reply - anybody got a factory email that may get to somebody who knows what they are doing?

Andy.
 

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There is an air dryer cartridge built into the pump. Obviously this has a limited life, which is why it is not recommended to use the air system for anything other than the air suspension and for emergency air to the tires.Marty
 

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I wonder if you put a vacuum pump on the system and ran it overnight ,you would remove the moisture from the dessicant pak? Marty
 

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Discussion Starter #12
Marty

I think what you actually need to do is de-pressurise the whole system through the N111 discharge valve to regenerate as much of the gel as possible and then have a source of dry air - a scuba tank and regulator would be ideal as the air is normally dehumidified to stop the tanks rusting - and use that to purge the whole system.

Not knowing where to connect it would be the problem and also persuading N111 to stay open.

Andy.
 

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Discussion Starter #13
Well, the garage checked it, but VW would not let me know what they were asked to check, and the result was that I said I will see them next winter...

But the problems continue, when I took it in as the aircon was not working - a pipe had rubbed and worn through - they 'noticed' that the front rotors and all the pads needed changing...

Andy.
 

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You should only consider changing pads and rotors [discs] if the brake wear warning light has come on when you will still have safe braking for at least 2,000 miles unless you are on them all of the time.

And I wouldn't use a dealer for this anyway.

You can buy OEM parts at discount and any good mechanic can change them.
 

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it is not a sealedf system. The pump gets it's air from the engine air filter box.

The air struts vent to atmosphere.

Find a dry day and go for a long run while cycling between offroad height and sport height to get all the moisture out.
 

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hi , i had some problems with air suspension in the past and i think i will change it to coils and dumpers. i looked on the internet ( UK sites ) and the only part i can find are the dumpers but no coils. is anybody there tried to do this swap ? or does anybody know where i can find coils/springs.
 

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I think you might run into problems regarding the electronics.

If it's all working fine why would you go to the trouble of messing up an excellent system on a great car?

Keep an eye on the air inlets going into the front struts - clean and grease twice a year - and you should be fine.
 
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