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Does anyone know what all those actuator noise is after turning the car off?

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Old 04-04-2018, 09:32 AM
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Does anyone know what all those actuator noise is after turning the car off?

After I turn the car off, lock it and walk away from it, I can still hear it doing a plethora of stuff in the background. I can hear actuator noises, pumps running. All this shuts off after a few minutes. I was just curious if any of you guys know what the car is doing exactly during this time.
Old 04-04-2018, 09:45 AM
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I've often wondered this myself. I can hear things happening from the moment I unlock the car most of the time as well. Post-shutdown, I've always half guessed something along the lines of a turbo timer to continue to circulate the oil during cool down.
Old 04-04-2018, 10:02 AM
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Its a norm. Happens to my car as well. What it does, i wish i knew lol.
Old 04-04-2018, 01:30 PM
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its possible it is some sort of pump to keep coolant flowing after car is off so you dont get hot spots in engine? I know the older mercedes did that especially when its really hot. prioblely hearing relays too after the systems shut down. remember there are many computers in this car to run everything.
Old 04-04-2018, 01:40 PM
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I've noticed this same thing, but only 3 or 4 times over the course of the time I've had my car ... about a year now.

No idea what it is or why it does it, but it also stops after 30 sec to a few minutes max.
Old 04-04-2018, 03:03 PM
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I always thought it was my mother in laws vibrator she left in the back seat
Old 04-04-2018, 03:04 PM
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Originally Posted by Gungaslow
I always thought it was my mother in laws vibrator she left in the back seat
How do you know she uses one?
Old 04-04-2018, 03:21 PM
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Originally Posted by munis
How do you know she uses one?
pretty sure she uses a big one... I believe it is gas powered with a chainsaw 2 stroke motor
Old 04-04-2018, 04:31 PM
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I know one of those noises is the parking brake that engages itself when you trun it off. It's more prevalent when you don't put the car in park. Turn engine off in drive still and open the door. (It doesn't harm the car, read it somewhere in the manual) You will here the parking break engage clearly.
Old 04-05-2018, 11:45 AM
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Originally Posted by agchenry
I know one of those noises is the parking brake that engages itself when you trun it off. It's more prevalent when you don't put the car in park. Turn engine off in drive still and open the door. (It doesn't harm the car, read it somewhere in the manual) You will here the parking break engage clearly.
The sound you hear is the fuel pump. 99% sure.
Old 04-05-2018, 12:36 PM
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The car will typically cool itself off for several minutes once you turn off the engine. I think its neat so the car will always be ready to perform
Old 04-05-2018, 12:44 PM
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Originally Posted by W205C43AMGCoupe
The sound you hear is the fuel pump. 99% sure.
one of them yes, but one of the many noises is the parking brake engaging

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