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Symptoms of bad Valve Block

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E-Class (W211) 2003-2009

Symptoms of bad Valve Block

 
Old 12-08-2015, 03:06 PM
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2004 E500 4matic
Symptoms of bad Valve Block

What can be symptoms of a bad airmatic valve block?
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Old 12-08-2015, 04:39 PM
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Without more detail about what you're talking about, all I can say is:

It won't hold air and the suspension will go down. You won't hear air escaping because it will be slow and the compressor acts like a muffler to silence any possible noise.

If you suspect the valve block and your suspension goes up but won't stay up, remove the short compressor hose from the block and use soapy water on the fitting. If it's leaking you'll get bubbles. If you don't get bubbles, it isn't leaking back through the valve block and your problem is elsewhere.

Beyond that, we need to know what's going on with your system. The most likely cause for a non functioning airmatic system is a blown airbag, blown rear shock, bad/worn compressor, or cracked line. Some of the early systems developed a crack on the reservoir tank seam but those should have all been taken care of by now. So the problem is usually not the block though it's always possible.
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Old 12-08-2015, 04:57 PM
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Originally Posted by Rob P. View Post
Without more detail about what you're talking about, all I can say is:

It won't hold air and the suspension will go down. You won't hear air escaping because it will be slow and the compressor acts like a muffler to silence any possible noise.

If you suspect the valve block and your suspension goes up but won't stay up, remove the short compressor hose from the block and use soapy water on the fitting. If it's leaking you'll get bubbles. If you don't get bubbles, it isn't leaking back through the valve block and your problem is elsewhere.

Beyond that, we need to know what's going on with your system. The most likely cause for a non functioning airmatic system is a blown airbag, blown rear shock, bad/worn compressor, or cracked line. Some of the early systems developed a crack on the reservoir tank seam but those should have all been taken care of by now. So the problem is usually not the block though it's always possible.
Ok so here's the situation... I'm bottomed out (all 4 to the ground) I took my car to my local mechanic and he told me something of a pressure line leak and also told me that it's the valve block.

Now after doing some research I read that the valve block distributes the air to struts/bags ... In my case it would make sense because when it does want to work the struts and bags hold the pressure
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Old 12-08-2015, 06:24 PM
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Will it lift at all? If not, then it's probably NOT your valve block. More likely it's your compressor or a blown bag. It's the fact that it came up that's key to show that the compressor is making enough air pressure to lift the car.

Valve block will let the car lift then it goes back down. How fast depends on how big the leak is. You can also get this effect from a blown bag but you will usually hear the air escaping on that wheel. It will sound like a hiss ssssssssss and not a blast of air SSSSSSSSSSSS!!!!! like from the gas station air hose.

How many miles? When was the last time you did any maintenance on the airmatic system like replace struts or bags or shocks? Last question, if the mech was so sure it was the valve block why didn't he fix it?
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Old 12-08-2015, 09:12 PM
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Originally Posted by Rob P. View Post
Will it lift at all? If not, then it's probably NOT your valve block. More likely it's your compressor or a blown bag. It's the fact that it came up that's key to show that the compressor is making enough air pressure to lift the car.

Valve block will let the car lift then it goes back down. How fast depends on how big the leak is. You can also get this effect from a blown bag but you will usually hear the air escaping on that wheel. It will sound like a hiss ssssssssss and not a blast of air SSSSSSSSSSSS!!!!! like from the gas station air hose.

How many miles? When was the last time you did any maintenance on the airmatic system like replace struts or bags or shocks? Last question, if the mech was so sure it was the valve block why didn't he fix it?
my bags/struts are not blown because when the car is ready on a lucky day it will raise to regular ride height and ride comfortably

When I turn the car on I used to hear the air getting distributed to the struts/bags. But now when I start the car the compressor comes on but you don't hear the "air" getting to the struts/bags then after 15 seconds or so the pump turns off and I get the "Visit Workshop" message

The reason why I didn't make him fix it is because why just throw the money at the valve block when I am not 100% sure
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Old 12-10-2015, 10:12 AM
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guided pneumatic test on compressor: step 1
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Old 05-22-2018, 11:24 PM
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Airmatic

[QUOTE=Rob P.;6638121]Will it lift at all? If not, then it's probably NOT your valve block. More likely it's your compressor or a blown bag. It's the fact that it came up that's key to show that the compressor is making enough air pressure to lift the car.

Valve block will let the car lift then it goes back down. How fast depends on how big the leak is. You can also get this effect from a blown bag but you will usually hear the air escaping on that wheel. It will sound like a hiss ssssssssss and not a blast of air SSSSSSSSSSSS!!!!! like from the gas station air hose.

How many miles? When was the last time you did any maintenance on the airmatic system like replace struts or bags or shocks? Last question, if the mech was so sure it was the valve block why didn't he fix it?[/QUOTE
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Old 01-18-2019, 07:03 PM
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Where would you start troubleshooting this situation?
Vehicle is a 2007 E550 with 101,000 miles.
I have owned it for 5 months and everything was fine until last week when I started the car I got the "Wait, Vehicle Rising" message. I got out to see what was going on and the rear wheels were fine but the front wheels were raising. A few days later the front wheels were noticeably low and I had to wait for the car to rise. Now, the front wheels are completely lowered after one hour of sitting. The car rises but I still have a leak somewhere involving the front wheels only. I can't hear any hissing noises. Where should I start?
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Old 01-27-2019, 01:57 PM
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2005 S430, My 747 and a 2017 Infiniti Q50, A mechanically and electronically modified BEAST.
Don’t forget relay and fuse. If the relay sticks it could burn out the pump.
I have just started replacing things on my Airmatic. I started off with the spring/grommet kit because my pump was making a vibration on the frame.
my rears lower a bit overnight, but as soon as I unlock the door the car rises.
It does not lower so much as to make me think there is a problem, but I like my cars to be smooth.

My next job is replacing the struts with the oem Bilstein (I don’t want to lose the sports settings that get lost with other replacements), and valve block and compressor at the same time.

Then motor and trans mounts.
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Old 01-27-2019, 07:06 PM
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Thank you Vinflouen for your input. Today I verified that the pump was working and filling the system. I also verified that the rear axle is not affected, that is they do not deflate and lower. Only the front lowers and at the same rate on both sides. I checked every connection and found no leaks. I read in a thread that if the valve block goes bad, it could leak air out through the compressor. I removed (loosened) the 10 mm nut on the valve block where the compressor is connected and there was a leak, verified with soapy water. As I understand it, and please correct me if I am wrong, the valve block should not leak from the compressor input line. So I guess I have a bad valve block, but I don't understand why only the front wheels are affected. Any thoughts??
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Old 02-11-2019, 09:09 PM
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Originally Posted by georgiabenz View Post
Thank you Vinflouen for your input. Today I verified that the pump was working and filling the system. I also verified that the rear axle is not affected, that is they do not deflate and lower. Only the front lowers and at the same rate on both sides. I checked every connection and found no leaks. I read in a thread that if the valve block goes bad, it could leak air out through the compressor. I removed (loosened) the 10 mm nut on the valve block where the compressor is connected and there was a leak, verified with soapy water. As I understand it, and please correct me if I am wrong, the valve block should not leak from the compressor input line. So I guess I have a bad valve block, but I don't understand why only the front wheels are affected. Any thoughts??
Any updates on this? I'm in the process of diagnosing a very similar problem. Replaced both front struts not long ago and the other day the front end was on the ground. Rear is not affected. Compressor runs after resetting the codes with MB II. The code that keeps coming back is 5508 - pressure line system leaks. The front right strut airbag is soft but the driver's side is harder but still lower than normal. I do hear a slight hissing noise when the pump is running near the pump, which is where the valve block is located. Haven't had a chance to open up the fender well and check for leaks yet.
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Old 02-12-2019, 10:44 AM
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I replaced the valve block with a used but working block, but it didn't fix the problem. The front struts leak all the way down but the rear is unaffected. I took the advice of others and decided to get a Star diagnosis but I also decided to buy the Chinese version on Ali Express for $249. Still waiting for it. I'll let you know what I find out. One strange thing is that I do not have any codes at all. It just leaks down and then inflates when I start the car.
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Old 02-14-2019, 09:30 PM
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Originally Posted by georgiabenz View Post
I replaced the valve block with a used but working block, but it didn't fix the problem. The front struts leak all the way down but the rear is unaffected. I took the advice of others and decided to get a Star diagnosis but I also decided to buy the Chinese version on Ali Express for $249. Still waiting for it. I'll let you know what I find out. One strange thing is that I do not have any codes at all. It just leaks down and then inflates when I start the car.
Could be leaking through the pressure release valve very slowly. That's on the air compressor.
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Old 02-14-2019, 11:20 PM
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Agent-A01, have you had this happen to you before? If so, is it a part that can be replaced or will I need a new/rebuilt compressor? I am waiting for my Star unit to arrive from Ali Express before I throw any more parts at it.
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Old 02-15-2019, 11:16 AM
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Originally Posted by georgiabenz View Post
Agent-A01, have you had this happen to you before? If so, is it a part that can be replaced or will I need a new/rebuilt compressor? I am waiting for my Star unit to arrive from Ali Express before I throw any more parts at it.
You can replace the the valve but it's near impossible to find.
Usually you'll just have to buy a reman or new unit.

Your issue of going low on both driver and passenger front is one of 3.
1. Both struts are leaking.
2. Bad valve/cracked air lines.
3. Leaking pressure release valve on air compressor.

I'd be wary of used valve blocks. They have rubber orings inside that dry rot.
Also if you 'man-handle' them you can unseal the valve block and have a small leak. I've done that in the past and had to get another one.
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Old 02-17-2019, 11:59 AM
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Agent-A01,
I ordered a used valve block on Ebay because I saw bubbles from air leaking out of the port on the valve block that connects the valve block to the compressor. I guess that wasn't the problem because it still leaks down with the new used VB installed. No more guessing, my SDS arrrives Tuesday. Do you have any experience diagnosing airmatic system with it?
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