[FieldingMellish]

Noticed recently, when I drive without music on, I can hear a strong hissing noise which seems to come from around the centre of the dash, and no it isn't the air-con! It increases as I speed up, I think it only happens when the engine is on and the car is moving. Hissing is the best way to describe it but I suppose it could be some other mechanical-related sound. Anybody else experienced this? Normal?


EDIT: It also happens when the car is out of gear and the engine revved.