Strange sound when car is off??
Thread Starter
Junior Member
Joined: Dec 2020
Posts: 53
Likes: 4
From: Oslo, Norway
W212 E350, W208 CLK320
Strange sound when car is off??
W212 2009 E350
Do any of you guys have a clue what in the world this sound is?? Here is the link to the video
The sound will start to come hours after the car is shut down.
Is usually comes every 30 seconds/1 minute or so , and it sounds as if it comes from the underside of the car. No electrical issues with the car, and it drives fine.
I don't know how many hours it will make this sound before stopping, but I never hear it when I look at the car the morning after.
Do any of you guys have a clue what in the world this sound is?? Here is the link to the video
The sound will start to come hours after the car is shut down.
Is usually comes every 30 seconds/1 minute or so , and it sounds as if it comes from the underside of the car. No electrical issues with the car, and it drives fine.
I don't know how many hours it will make this sound before stopping, but I never hear it when I look at the car the morning after.
Out Of Control!!
Joined: Apr 2019
Posts: 11,958
Likes: 6,802
From: Silicon Valley
W212 MY'14 M276-3.5NA @75kMi
cooling noise under hood
this topic came up a while ago... I forgot what the answer was.
I only recall this hissing not being a problem.
I only recall this hissing not being a problem.
Last edited by CaliBenzDriver; Jun 3, 2024 at 06:13 PM.
Thread Starter
Junior Member
Joined: Dec 2020
Posts: 53
Likes: 4
From: Oslo, Norway
W212 E350, W208 CLK320
Out Of Control!!
Joined: Apr 2019
Posts: 11,958
Likes: 6,802
From: Silicon Valley
W212 MY'14 M276-3.5NA @75kMi
hissing while cooling
It sounds like some pressure bleeding back down:
- ABS Pump accumulator
- GDI high gas pressure
- EVAP tank vacuum
- ....
Is not...:
- coolant circuit
- ATF tranny
- ....
There's always something left to be discovered!
