Noise hours after car is turned off
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Newbie
Joined: Sep 2018
Posts: 1
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2001 S500
Noise hours after car is turned off
My 2001 S500’s engine has begun making a loud humming/buzzing noise after I have removed the key from the ignition and locked the car. When I open the hood, the engine compartment is vibrating.
I’ve left it for almost two hours after use and it still was going. I disconnected the battery and it stopped.
Any idea what could be causing this? I’m concerned it could be the ABC pump. Thank you!
I’ve left it for almost two hours after use and it still was going. I disconnected the battery and it stopped.
Any idea what could be causing this? I’m concerned it could be the ABC pump. Thank you!
Super Member
Joined: Sep 2012
Posts: 690
Likes: 76
From: Montreal, Quebec
2009 E350 4M Avantgarde;mistress 2002 S600; wife 2014 C300 4M
The ABC pump is engine driven.
If you have airmatic suspension, the ELECTRIC compressor pump can run on if the relay is bad.
Read, read, read here and search, also on the other forum. (Benzworls)
If you have airmatic suspension, the ELECTRIC compressor pump can run on if the relay is bad.
Read, read, read here and search, also on the other forum. (Benzworls)
MBWorld Fanatic!
Joined: Jan 2008
Posts: 6,151
Likes: 533
Mercedes
You probably don’t have abc you have airmatic . Two different suspensions .
a bad airmatic relay causes the pump to run till it burns itself out . Your pump is likely seriously damaged from running so long
first try a new airmatic relay . If your pump still works you got lucky . If your pump had Burned up you’ll need both a relay and a pump
a bad airmatic relay causes the pump to run till it burns itself out . Your pump is likely seriously damaged from running so long
first try a new airmatic relay . If your pump still works you got lucky . If your pump had Burned up you’ll need both a relay and a pump
