High pitch shreek noise coming from dash area when going over 100

I have a 99 vitz clavia and only recently when we
travel over 100-110kmh a very irritating high pitch
shreek comes from behind the dash in the centre
of the dash. It does it at lower speeds if it's windy
or if a truck comes the other way and we go
through the trucks air flow.

I pulled the glove box out and cleaned the cabin air
filter, that wasn't it and, I can't see how to remove
anymore parts behind the glove box.

Anyone had this also and know what it is please