Check that the bonnet is aligned correctly with the front and rear weatherstrip, also check that the sound-proofing panel is correctly secured.
Carry out a road test to locate the wind noise, steering sharply to the left and right (to bring the body under torsion), whilst respecting the highway code.
Tape the various areas illustrated in the diagram using bodywork gummed paper.
Carry out a road test, letting the vehicle gradually reach the speeds where the noise starts: if the wind noise persists, check that the plugs are present and that the bulkhead coupling rubber seals in the fire-proof partition are correctly fitted.
Remove the gummed paper from area A and repeat the road test: if the wind noise persists, check the buffers where the bonnet and the wings match at the rear.
Remove the gummed paper from area B and repeat the road test: if the wind noise persists, check the condition of the front weatherstrip and make sure it is correctly fitted (it should adhere perfectly to the crossmember when the bonnet is closed).