Hi, im new to citroen cars and need a little advise... Citroen C4 VTR+ 2005 Coupe 1.6 PETROL 67500 Miles Everything works great... However when driving, whether hot or cold engine something is making a whining sound! It does it whether moving or just revving the engine the whining goes up and down along with the engine rev speed, a bit like a belt spinning faster and slower. Reminds me of an old Austin Metro!!!! Can't really hear it inside the car, should it be something I should be worried about? or is it a sound these engines make?