What is running?
Thread Starter
Newbie
Joined: Mar 2011
Posts: 14
Likes: 0
From: OH
2014 ML350 W166
What is running?
Yesterday, I backed my C300 Sport from the garage into the driveway. I cleaned the wheels then pulled the car back into the garage. A couple of hours later, Idecided to clean the exterior of the windows. When I was cleaning the windshield, I could hear something running...sounded like the Heater/AC fan. The key was not in the ignition and all the doors were closed. It was a very faint sound.
Any ideas? I tried doing a search, but didn't find any information.
Any ideas? I tried doing a search, but didn't find any information.
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Thread Starter
Newbie
Joined: Mar 2011
Posts: 14
Likes: 0
From: OH
2014 ML350 W166
It does sound like a computer fan now that you mention it. However, I don't have the COMMAND/Nav package.
I didn't have my car running long enough for anything to get hot and the air temp was low 60'sF. Plus, when I heard it, the car had been sitting in the garage for around two hours.
I didn't have my car running long enough for anything to get hot and the air temp was low 60'sF. Plus, when I heard it, the car had been sitting in the garage for around two hours.
Super Member
Joined: Mar 2011
Posts: 803
Likes: 37
From: Bay Area, CA
2011 C300 Sport, P1, MM, Wood, Heated FS, DIY rearview camera.
I also noticed similar sound. However, when I sit inside, close all doors, not playing anything that relates to electrical controls, and wait long enough for like 5 minutes (I didn't count), the running sound is gone, no sound at all. At soon as I open one door, the sound comes back. I haven't tried other things to find what else will bring the sound back.
Super Member
Joined: Mar 2011
Posts: 803
Likes: 37
From: Bay Area, CA
2011 C300 Sport, P1, MM, Wood, Heated FS, DIY rearview camera.
Just for fun, I sat inside and closed all doors. after about 3 minutes the sound was gone. I turned on the vanity mirror lights, no sound. I pushed back dome light button, the sound came back.
MBWorld Fanatic!
Joined: Sep 2009
Posts: 2,108
Likes: 7
From: Dix Hills, New York
2012 C250 Coupe
Are you guys talking about the noise you hear about 30 seconds after you shut off your car, and then again after like 2 minutes of your car being off?
To me it sounds like a valve or something closing in two stages. One 30 seconds after the car has been off, and then again (in a different area further into the engine compartment) a few minutes after the car has been off. I have assumed that these are ducts that close the air vents or something to help insulate the car from the outside?
To me it sounds like a valve or something closing in two stages. One 30 seconds after the car has been off, and then again (in a different area further into the engine compartment) a few minutes after the car has been off. I have assumed that these are ducts that close the air vents or something to help insulate the car from the outside?
Super Member
Joined: Mar 2011
Posts: 803
Likes: 37
From: Bay Area, CA
2011 C300 Sport, P1, MM, Wood, Heated FS, DIY rearview camera.
I am talking about the noise not engine related. Any time I open the door, this noise starts. Three minutes after all doors are closed and no electronics are played (vanity mirror light is an exception), noise will disappear. Noise is very low but i can hear it, like a quiet fan or a CD player running.
