320d Ed Rattle Noise From Cold Start

[Bimmer84]

Gents

A tricky one for me, the rattle sounds like some sort of a loose trim that makes noise when starting cold at around 1500 rpm. Its very clearly heard from inside of the car as compared to the outside. From inside, it seems to come from under or behind glove compartment area. It goes away when the engine gets warm. Its sounds very plasticy if you know what I mean but what I don't understand is that if its a plastic trim that's rubbing against something at certain rpm range, why does it go away after certain time of engine running.

I have taken the car to couple of garages and they are unable to locate it. Like I said, the noise doesn't sound mechanical at all but goes away after the engine has been running for about 20 to 30 minutes.

Has anyone experienced anything similar? Any help would be appreciated.