Hi, I have a K Reg Diesel Fiesta which seems to have developed a water leak somewhere. I only have to top up the reservoir about every six weeks, so I know it's not a bad one (yet). The water reservoir bottle however is rusty inside. The radiator seems fine with no hint of a leak there and the head gasket is also fine. Could it be the water pump? I can also here a strange noise in the engine when I am sitting at lights etc which sounds like half a heart beat. I can't hear it all the time though and it's very faint.
I would appreciate any advice please Thanks