Strange noise after turning engine off.

[ferrispedro]

Good day all,this is my first post after buying a 2002 ML270.I am delighted with my first dabble in the MB field but slightly puzzled by a sound I get after switching the engine off.It sounds as if something is still quietly running in the engine compartment.Probably a simple explanation (I hope!) Peter.

 

[djb]

welcome to the forum

yes there are various items that run on for a short while, then turn off, my clk does a sort of zizz, followed by a light thuck, so I imagine the ml is similar, so nothing to worry about. Others more knowledgeable will list all the items that stay awake on ignition off.

David

 

[coxyhog]

Possibly the fan.

 

[LSD]

Better than a strange noise after turning it on...

 

[BlackC55]

A small pump runs and is perfectly normal.

 

[star]

or it could be the vacuum modulator valve just humming as the vacuum dissappears. Normally its the one by the battery on a ML.

 

[ferrispedro]

Thanks everyone,I'm a lot more relaxed now. Peter.