E350 - whistle sound on cold start

Mujja

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C207 2016 E350
I've only been taking the car for a drive in the late afternoon, it's the first start of the day and I've noticed a whistle, doesn't sound like a belt.

It's after a gentle 200m drive down the street to the junction.

After the car has been parked up for an hour while I do some shopping or go for a walk the sound isn't there. Only the following afternoon when I start the car for the first time.

Is this a know issue? Read something about a breather fan running at startup until some other component gets up to speed.
 
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Mujja

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C207 2016 E350
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Yes, engine is smooth, no turbo like sounds when pushed either.

Will try and book it in with an Mercedes specialist for next week. Tried calling today when I had a few mins free from work but no answer.
 

Trev1964

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CLS 250 cdi estate 2013
My slk did this.
Secondary air pump. Its emissions bollox from cold start.
I took it it off and found carbon dust build up inside it from the motor brushes.
Gave it a thorough clean and reassembled and refitted.
Sorted.

Worth a look..
 

DREAMER NO2

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W124 2.6E M103 1989
Sounds like a gasket leaking or a seal .Only whistling i had on a Mercedes was on my W124 it was the exahust manifold gasket >only when cold <..
 
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Mujja

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C207 2016 E350
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Just been out for a quick drive and walk before it gets too hot and the paths gets crowded.

After further listening it could be a belt noise and the sounds. When stopped near a wall I could still just about hear it, so it doesn't completely go away.

The car still has 5 months warranty remaining which was included when I bought the car. I'll try and get the car booked in and hopefully if is an issue it'll be a part covered under the warranty.
 

Trev1964

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CLS 250 cdi estate 2013
If it stays after cold start, that sounds like a pulley bearing.
 

Jim2

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1st Merc 2010 E Class W212 2.1 CDI. 2nd Merc 2014 E Class W212 220 CDI
I have a whistle issue too,,,when I turn the key, and it start's up, there is a whistle noise for a few seconds, then it's gone. I've had some one stand outside the car, with the bonnet raised, and they cannot hear anything out of the ordinary,,but I can definitely hear it while sitting inside. Anyone else experience this problem?
 

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