hi i have a rattle on the front of my td5 that to the naked ear sounds like a pulley rattle and when aircon is turned on the rattle disapears until it goes off or when given small amount of revs so i took off the aux belt to see if the rattle disapeared but instead it turned into like a bell ringing sound. it still starts and drives fine and still pulls like a train accelarating very well

any ideas anyone ?

thanks in advance Neil