This is on a friends 1.2 Clio 2. Seems to come from the engine bay although nothing unusual on checking. Only comes on above about 35 and briefly goes away at 65-70. Gets ever louder from 35 up. I am not mechanically minded really and just wondered if anyone has any ideas as to what it could be? No problems with running of the car. Ticks over fine. N warning lights on dash. Cheers in advance for any suggestions.