Okay my buddy has a 2013 Cls 550 and just untill about a week ago the fans started to run on full blast, the car literally sounds like a jet in the driveway, anyways i did a little research and was reading about the ECU for the fan going bad but i don't know if this model year was affected, anything would help, its getting to the point that the fan is sapping so much juice it's draining the battery down. Thanks again!