Dashboard rattle / vibration

[Yorky1]

The top of the dashboard in my Nissan Primastar ( same as Vauxhall Vivaro / Renault Trafic) is slightly loose and therefore vibating/rattling. It's the part which goes from one side of van to the other, across the very top of the dashboard.

Does anyone know how to fix this? Had the van serviced but the mechanic doesn't seem to want to take it on.

Thanks in advance

 

[RedHerring2]

I'm not familiar at all with the vehicle.
Could you not inject a bit of silicon sealant between the mating faces to prevent the rattling?