hissing noise
Thread Starter
Almost a Member!
Joined: Feb 2007
Posts: 43
Likes: 0
From: Dallas, TX
BMW X5, GL450, Saab 9-3, E550
hissing noise
New GL450 (1200 miles) has been making a hissing noise after the engine is turned off and you exit the car. Today it made the noise right after the valet handed it over.
The hiss is brief and sounds like a quieter version of a semi-trailer's brakes.
Anyone know if this is normal for the airmatic suspension or if I should have it checked out at the dealerhip?
Thanks
The hiss is brief and sounds like a quieter version of a semi-trailer's brakes.
Anyone know if this is normal for the airmatic suspension or if I should have it checked out at the dealerhip?
Thanks
Junior Member
Joined: Jun 2006
Posts: 64
Likes: 0
From: Walnut Creek, CA
2022 GLE 350; 2016 BMW 428i gran coupe; 2014 Audi Q5 tdi
New GL450 (1200 miles) has been making a hissing noise after the engine is turned off and you exit the car. Today it made the noise right after the valet handed it over.
The hiss is brief and sounds like a quieter version of a semi-trailer's brakes.
Anyone know if this is normal for the airmatic suspension or if I should have it checked out at the dealerhip?
Thanks
The hiss is brief and sounds like a quieter version of a semi-trailer's brakes.
Anyone know if this is normal for the airmatic suspension or if I should have it checked out at the dealerhip?
Thanks
Super Member
Joined: Jan 2007
Posts: 537
Likes: 2
From: Land of Magnolias and Mint Juleps
New GL450 (1200 miles) has been making a hissing noise after the engine is turned off and you exit the car. Today it made the noise right after the valet handed it over.
The hiss is brief and sounds like a quieter version of a semi-trailer's brakes.
Anyone know if this is normal for the airmatic suspension or if I should have it checked out at the dealerhip?
Thanks
The hiss is brief and sounds like a quieter version of a semi-trailer's brakes.
Anyone know if this is normal for the airmatic suspension or if I should have it checked out at the dealerhip?
Thanks
Member
Joined: Mar 2007
Posts: 226
Likes: 0
From: South of the Mason Dixon, North of the Gulf
2007 GL 320 CDI, 2008 M5
New GL450 (1200 miles) has been making a hissing noise after the engine is turned off and you exit the car. Today it made the noise right after the valet handed it over.
The hiss is brief and sounds like a quieter version of a semi-trailer's brakes.
Anyone know if this is normal for the airmatic suspension or if I should have it checked out at the dealerhip?
Thanks
The hiss is brief and sounds like a quieter version of a semi-trailer's brakes.
Anyone know if this is normal for the airmatic suspension or if I should have it checked out at the dealerhip?
Thanks
The sound you hear is normal. It is the airmatic adjusting itself. Actually the car will adjust itself even if you come to a stoplight and get slowed or stopped. The car will raise and lower itself as it is programmed to do.
You will get used to it, just like having your wife hiss at you when you say something stupid.
Trending Topics
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
MBWorld Fanatic!
Joined: Mar 2007
Posts: 1,653
Likes: 7
From: Central Pa.
2013 GL450 (traded for 2015 Escalade), 2012 Corvette, 2014 Ford Fusion, Previous: 2007 GL450, 2011
New GL450 (1200 miles) has been making a hissing noise after the engine is turned off and you exit the car. Today it made the noise right after the valet handed it over.
The hiss is brief and sounds like a quieter version of a semi-trailer's brakes.
Anyone know if this is normal for the airmatic suspension or if I should have it checked out at the dealerhip?
Thanks
The hiss is brief and sounds like a quieter version of a semi-trailer's brakes.
Anyone know if this is normal for the airmatic suspension or if I should have it checked out at the dealerhip?
Thanks
Actually, the vehicle will do this quite frequently if you open and close the doors or the tailgate ( engine running or off ) If you watch closely, you can see the front or rear going up or down. Perfectly normal.
Super Member
Joined: Nov 2001
Posts: 524
Likes: 0
From: MS Gulf Coast
1997 E320 Sedan
I believe it was carprsn who described it as a hot frying pan with water poured on it! 
It is normal and it happens not only when exiting, but also while in motion. I heard it several times just today.
It is normal and it happens not only when exiting, but also while in motion. I heard it several times just today.
Almost a Member!
Joined: Feb 2007
Posts: 64
Likes: 0
From: North, MS
GL450
I have a Jan. '07 build date. Initially started noticing what seemed to be a front end suspension problem in that it would make a "thud" noise going over even small potholes, etc. Thought it was just me or it was the low profile tires. Just recently it showed a Malfunction Symbol Message on the Multifunction Display. The symbol is a pic of the GL with an arrow pointing up. Took to the Memphis dealer(not where I bought it). Two days later back in business. Advisor said they replaced the compressor and that they have seen this problem before. Did not want to give back the C230 Sport loaner. What a fun little car!
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
Super Member
Joined: Nov 2001
Posts: 524
Likes: 0
From: MS Gulf Coast
1997 E320 Sedan
I have a Jan. '07 build date. Initially started noticing what seemed to be a front end suspension problem in that it would make a "thud" noise going over even small potholes, etc. Thought it was just me or it was the low profile tires. Just recently it showed a Malfunction Symbol Message on the Multifunction Display. The symbol is a pic of the GL with an arrow pointing up. Took to the Memphis dealer(not where I bought it). Two days later back in business. Advisor said they replaced the compressor and that they have seen this problem before. Did not want to give back the C230 Sport loaner. What a fun little car!
Almost a Member!
Joined: Feb 2007
Posts: 64
Likes: 0
From: North, MS
GL450
Sound like you may need to get it checked out. By the way, some guys who own big trucks tell me that it's not too uncommon that a turbo hose will blow off after taking delivery of a new truck. And like I had mentioned before, I have an '05 Ford diesel that done it 4 or 5 times. I think they fixed with two clamps, cleaned it with brake cleaner and some type of adhesive.
MBWorld Fanatic!
Joined: Aug 2003
Posts: 5,517
Likes: 20
From: Las Vegas, NV
2011 E350 Cabriolet..White and Almond Mocha
I just reported to NevadaJack last night that I am hearing this very sound also! I can't pin point where it is coming from other than the front right side and it mainly happens while traveling over rough roads, etc. It doesn't happen all the time but its happening more often now. To me it sounds like a door not closed all the way. I've receive no error messages and the air suspension seems to work just fine so far.
Senior Member
Joined: Jul 2006
Posts: 252
Likes: 0
From: New Jersey, USA
2007 GL450, 2006 Porsche 911, 2004 VROD
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
Newbie
Joined: Apr 2016
Posts: 1
Likes: 0
2013 GL450
Hello. Bought a 2013 GL450 4matic as CPO w/ 31,000 miles almost 2 weeks ago. Just noticed a brief screeching noise after the car is turned off. Some of the earlier posts from above say it's a "hissing" sound. Sometimes the screeching noise happens and sometimes it doesn't. Can anyone tell me what this problem might be? Other than that it is a really nice ride! Thanks!
