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: 47,623 mi (10,000 mi - 78,000 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, 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, 2010 Mercedes-Benz CLS550, 52,310 mi
Same problem. Taking to dealer tomorrow
Visitor, 2008 Mercedes-Benz CLS550, 56,000 mi
malfunction light comes on airpump not working
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, 2008 Mercedes-Benz CLS550, 10,000 mi
my cars airmatic will noy start or air up my front suspintion.
Visitor, 2007 Mercedes-Benz CLS550, 47,300 mi
my car currently in shop for malfunction to the airmatic system... not sure exactly what's wrong yet. my paddle shifters failed at 36k miles. I love the car but i don't think i'll buy another MB. These cars are very nice but not very reliable and for the 80k that my cls costed, i think it's crazy. I'm going to try my luck with a lexus i do believe they are much more reliable and less maintence