A sticking relay, causing the airmatic pump motor to constantly run, may causee the airmatic pump motor to fail or the battery to go dead when the car is shut off. Worn airmatic pump mount bushings can causes noises in the front axle while driving on bumpy roads or a buzzing noise.Google+
Car Problem Reports
Mercedes-Benz CLS550 Airmatic Pump Motor May Fail Due to Sticking Relay
Mercedes-Benz CLS550 Problem
Average Mileage: 58,177 mi (10,000 mi - 120,000 mi)
Visitor, 2007 Mercedes-Benz CLS550, 78,000 mi
Turned the car off, pump motor continued operating for about 15 minutes. Made a loud buzzing sound and then an intermittent buzzing sound. Just happened last night so haven't had a solution yet.
Visitor, 2008 Mercedes-Benz CLS550, 87,700 mi
My car is visibly "crooked". The left side appears to be the normal height, but the right side is very low. I have no warning lights or error messages. It states "vehicle rising" so when I go to drive it I think it's lifting but not all the way. When parked the right side is 3-6" lower than the left.
Visitor, 2007 Mercedes-Benz CLS550, 58,000 mi
ride height fine - eveb a bit high but compressor runs anyway even after shut off - I am replacing the entire system with manual springs and struts - screw them - its cheaper than constant repairs
Visitor, 2008 Mercedes-Benz CLS550, 56,000 mi
malfunction light comes on airpump not working
Visitor, 2010 Mercedes-Benz CLS550, 52,310 mi
Same problem. Taking to dealer tomorrow
airmatic seem to have failed bsck is lowere
Visitor, 2007 Mercedes-Benz CLS550, 43,000 mi
Hasn't been fixed yet. Looking for a way to fix this issue.
Visitor, 2007 Mercedes-Benz CLS550, 120,000 mi
Noise when riding on bumby roads
Visitor, 2007 Mercedes-Benz CLS550, 60,000 mi
I am having the same problem as reported. The driver side of my car is slammed while the passenger side appears fine. I noticed when I shut the car off to get gas that the front drivers side wheel area was still making noise. Took the relay out for time being until I can get into Mercedes. Hope its not too costly but I'm sure it will be!
Visitor, 2008 Mercedes-Benz CLS550, 10,000 mi
my cars airmatic will noy start or air up my front suspintion.