Air release noise (pssst) whenever coming to a stop
Thread Starter
Member
Joined: Apr 2003
Posts: 212
Likes: 0
From: Bay Area, CA
2015 GL550, 2019 GLC350e
Air release noise (pssst) whenever coming to a stop
I've been hearing what sounds like a air release noise from the passenger side whenever I come to a stop. Usually it's more noticeable right after we start the car.
Anyone else hear this?
I'm thinking it can wait until I bring the GL in for the free tire rotation to have a tech take a look.
Anyone else hear this?
I'm thinking it can wait until I bring the GL in for the free tire rotation to have a tech take a look.
Senior Member
Joined: Mar 2007
Posts: 379
Likes: 0
From: MA
13 SL550, 14 E63 Wagon, 15 S550, 11 M3, 08 F430 Spider, 12 ML350
I've been hearing what sounds like a air release noise from the passenger side whenever I come to a stop. Usually it's more noticeable right after we start the car.
Anyone else hear this?
I'm thinking it can wait until I bring the GL in for the free tire rotation to have a tech take a look.
Anyone else hear this?
I'm thinking it can wait until I bring the GL in for the free tire rotation to have a tech take a look.
Senior Member
Joined: Mar 2007
Posts: 379
Likes: 0
From: MA
13 SL550, 14 E63 Wagon, 15 S550, 11 M3, 08 F430 Spider, 12 ML350
There have been a couple of reports of failures in the air suspension involving compressors or other components. I think it been very rare and in early builds but I would get it checked out.
Senior Member
Joined: Oct 2005
Posts: 352
Likes: 1
From: fl
1992 500E, 2006 E500, 2007 GL 450
Not so rare. My GL 450's air suspension failed at 2000 miles (Nov 2006 build). Dealer says its quite common and keeps a stock of new compressors at hand. About a week ago I saw an new ML550 at the dealer with a failed compressor.
MBWorld Fanatic!
Joined: May 2007
Posts: 2,244
Likes: 1
From: Scottsdale, AZ
2004 RX330, 2008 Scion xB, 2001 Honda Insight Hybrid, 2010 Toyot Prius v ATP
I've been hearing what sounds like a air release noise from the passenger side whenever I come to a stop. Usually it's more noticeable right after we start the car.
Anyone else hear this?
I'm thinking it can wait until I bring the GL in for the free tire rotation to have a tech take a look.
Anyone else hear this?
I'm thinking it can wait until I bring the GL in for the free tire rotation to have a tech take a look.
Trending Topics
MBWorld Fanatic!
Joined: Feb 2007
Posts: 2,548
Likes: 3
From: LA LA Land
'07 GL 450, '02 S 80 T6
Faulty air compressors, especially in the early GL build cycle, were very common. I have 3 owners who have had the GL for a year or more and all 3 have had airmatic failure.
MB World Stories
The Best of Mercedes & AMG
Manual Mercedes? 6 Times Sindelfingen Let Drivers Have All The Fun
Verdad Gallardo
Mercedes SLR McLaren 722 S Is Extremely Rare Example Modified by McLaren
Verdad Gallardo
8 Classic Boxy Mercedes Designs That Have Aged Like Fine Wine
Verdad Gallardo
Flawlessly Restored Mercedes 190E Evo II Heads to Auction
Verdad Gallardo
Electric Mercedes C-Class Unveiled: 11 Things You Need to Know
Verdad Gallardo
Mercedes EQS Gets A Major Update: Everything You Need to Know
Verdad Gallardo
5 Underrated Mercedes-Benz Models That Don't Get the Love They Deserve
Verdad Gallardo
Mercedes 300D Has Pushed Well Past 1 Million Miles and It Ain't Stopping
Verdad Gallardo
10 Most Reliable Mercedes-Benz Models You Can Buy Used
Verdad Gallardo
Thread Starter
Member
Joined: Apr 2003
Posts: 212
Likes: 0
From: Bay Area, CA
2015 GL550, 2019 GLC350e
Ouch! a little over 1K miles on it right now. the air noise is coming from the front passenger. it makes sense, as the noise is apparent only during braking. i guess the weight on the compressor is causing it to release the air?
Thread Starter
Member
Joined: Apr 2003
Posts: 212
Likes: 0
From: Bay Area, CA
2015 GL550, 2019 GLC350e
actually, i notice the car will lower/level itself if you are idling or stopped for a long duration. i believe the air suspension raises the car for a more "comfort" ride but lowers itself for easier exit and entry.
MBWorld Fanatic!
Joined: May 2007
Posts: 2,244
Likes: 1
From: Scottsdale, AZ
2004 RX330, 2008 Scion xB, 2001 Honda Insight Hybrid, 2010 Toyot Prius v ATP
STP
MBWorld Fanatic!
Joined: May 2007
Posts: 2,244
Likes: 1
From: Scottsdale, AZ
2004 RX330, 2008 Scion xB, 2001 Honda Insight Hybrid, 2010 Toyot Prius v ATP
STP
Senior Member
Joined: Oct 2011
Posts: 399
Likes: 14
From: Chicago, Illinois
2008 S63
im also getting this "whoosh" noise. I get it while braking mostly but have heard it while driving and after parking the car. sounds like the airmatic is releasing air along with a rubbery squeal. anyone ever have this
Junior Member
Joined: Jun 2015
Posts: 46
Likes: 9
2011 GL450
I know the noise you're talking about, my 2011 GL450 does that. I've been meaning to check into it because it is not normal on the earlier models. I'm inclined to think it is a design upgrade for the later models, maybe to get rid of moisture in the system kind of like an air line dryer for a shop air compressor. My vehicle is not having any suspension problems (at the moment) so I don't think it's something abnormal. Maybe someone who knows the real story will chime in.
MBWorld Fanatic!
Joined: Aug 2003
Posts: 8,882
Likes: 1,212
From: In my garage
E55, GLS450, GL63, GLE350
My 2007 GL450 has always made the woosh noise. It's usually when I unlock the door first thing in the morning or sometimes while driving as well as when I exit the vehicle after a long trip.
Member
Joined: Jun 2010
Posts: 246
Likes: 3
From: SoCal
2012 GL450, 2013 Lexus GS350 F-Sport
From my understanding, it's how the GL levels itself. I have a longer driveway with an incline, the car does it's best to level itself while the car is stopped on the driveway (and we unload the Costco groceries, sporting goods, etc.). After unloading and driving the car into the garage and shut off (where the ground is level) I'll hear the "hissing" noise, assuming the air bags are still trying to level the car, even after the car shuts down.
Newbie
Joined: Jun 2016
Posts: 3
Likes: 0
S class w221
Newbie
Joined: Jun 2016
Posts: 3
Likes: 0
S class w221
To much "Woosh sound "while driving normally relates to suspension relay(fuse) or air compressor.
Apparently common fault is relay which keeps compressor in ON setting at all times. It can cause damaging compressor.
Newbie
Joined: Feb 2013
Posts: 2
Likes: 0
2010 GL 450
Had the same issue and could hear the sound, like a pressure relief valve opening, when approaching stop signs. I complained several times and got no help. An independent mechanic said the Benz isn't supposed to make noises like that, so I kept bugging the dealer. They finally admitted it was an issue, and what they told me is that there is a "silencer" on a relief valve that's supposed to muffle the noise and that the hose had come off of the silencer. The release of air was said to be normal and when they put the hose back on (assuming they did so) the noise once again only became noticeable when outside the car, in the garage, either when shutting down or when opening the door to get in and go.
MBWorld Fanatic!
Joined: Oct 2004
Posts: 4,152
Likes: 60
From: NJ, NYC
Something Slow
so today i took out the fender liner to check out the hissing sound.. the noise is coming from the pump intake hose which has a filter on it i replace the filter which is a mann filter 212-320-0169 or mann filter wk32/7.. its a basic fuel filter they used.. i am still getting the hissing sound.. but i then found this see link below ..its some sort of noise damping mat. now its to find it
http://workshop-manuals.com/mercedes...ic_compressor/
http://workshop-manuals.com/mercedes...ic_compressor/
Member
Joined: Sep 2017
Posts: 129
Likes: 117
From: Spring, TX
'07 S65 '05 SL65 '07 GL450 '03 SL55 (sold)
Loud and Long Hissing Sound
I've owned my '07 GL450 since new. It currently has 190K miles. I replaced the air compressor and front struts about 1.5 months ago. No codes in the suspension system with MBII and all of the struts are proper height and not losing air. Been noticing a louder and longer hissing sound lately. It's usually when the last door is shut when parked and then this loud and prolonged "TTTttttttsssshhhhhTTT' sound. Ever since it was new, it's always had the normal "Phstt" sound sound when closing a door when parked. But ever since the new compressor was installed, the sound has become much more pronounced and longer. I found this thread from a few years ago and the link in the post above describes a damping mat that was used in the vicinity of the Air Compressor Filter Assembly. Couple of questions: Has anyone ever heard of this damping mat? Does it work? (I could not find it on the internet). Is the air compressor filter hose also the discharge hose that makes the noise when closing the door and/or is there a separate discharge hose/port on the air compressor. If the air compressor filter hose is also the discharge port, will replacing the air compressor filter help to alleviate the loud noise upon closing the door? Btw, I don't think the air compressor filter has ever been changed. I know it's supposed to be a maintenance item. I just haven't ever replaced it. This is the car's third air compressor (this latest one is a free replacement from Arnott and I did install the new relay that came with this latest compressor). This seems to be an occurrence across many different airmatic models, and after searching I still haven't found a definitive answer. Any thoughts are appreciated!
MBWorld Fanatic!
Joined: May 2015
Posts: 1,932
Likes: 291
From: Allentown, PA
'08 GL 320 CDI
I don't think I can completely answer your question, but I'll offer an opinion on what it "generally" seems like the issue is. It sounds like you're saying you're experiencing an extended pressure relief (phstt). If so, to me, that sounds like something is partly clogged, not letting the air out as fast as it should. That could also, in theory, lead to longer compressor run times and early (er) failure. To your question on whether the filter is the issue (and/or the discharge path)... maybe try disconnecting the filter for a short drive? See if the sound changes?
I would think (again, though, without fully knowing) that the discharge is a separate spot than the filter/intake. Possibly looking/googling for pictures of the valve block would help?
You mentioned that you replaced the compressor... do you recall anything on it that would indicate the discharge happens there?
I would think (again, though, without fully knowing) that the discharge is a separate spot than the filter/intake. Possibly looking/googling for pictures of the valve block would help?
You mentioned that you replaced the compressor... do you recall anything on it that would indicate the discharge happens there?
