Hi all I'm getting this sound at hwy speeds going into headwind it sounds like perhaps wind causing the vent door to vibrate?.... any suggestions

Try blocking off the air intake to the cabin and see if the noise disappears which would point to the vents.

This is a grid just under the windscreen...on my RHD KJ it is on the RHS and I presume it is likewise on the RHS for the LHD models.

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2002 Export CRD

Thanks I'll try that