Preliminarily check that the bonnet is properly closed

Check that the noise is actually coming from the bonnet lid by carrying out the test for locating the noise See Test 70A Rustle detection (preliminary detection)

Move onto step 1

• Check the diagnostic table corresponding to the area located.

End of diagnosis

Carry out the detailed test for locating noise from the bonnet lid See Test 7025A Engine bonnet rustle detection and identify the area where the noise is coming from.

No wind noise is locatedMove onto step 2

• Check the foam blocks at the point where the bonnet and wings fit together at the rear
• Check the condition of the wind seal and make sure it is properly fitted Op. 7025A62

End of diagnosis

• Check for the presence of a seal between bonnet and radiator shield Op. 7055A40

End of diagnosis

• Check the condition of the front wind seal and make sure it is properly fitted Op. 7025A62

End of diagnosis

Check the flame damper partition. In particular, ascertain:

• the plugs are fitted
• the plugs are correctly fitted
• the rubber cable covers are fitted correctly
• the sealing is efficient
• correct assembly

Move onto step 3

• Renew the flame damper partition

End of diagnosis

Check that the fault is no longer present

End of diagnosis

Incorrect selection of diagnostic procedure