That could be a few things, the suction fan should not operate like that when its cooling so unless you have AC rest running i would call it not normal thats not to say its bad.
What I'd recommend is pop the hood when you park up and have it opened up before you lock the car then give everything under it a good inspection and a listen.
Anything directly connected to the engine should not be operating, it has a few pumps and things that sound like your noise.
The suction fan can operate at any time, the AC intake fan should not operate unless REST is active
And finally the duovalves and the electric coolant pump should not operate unless REST is active.
__________________ One thing you will learn with German cars - If it's simple it ain't happening. |