I am losing anti freeze/water and I know it isnt internal b/c I can smell it as I am driving every now and then. Nothing in the overfill but the internals to that long tube in the overfill is gutted... not sure if that makes a difference. I was mostly wondering if the cap on the radiator could be leaking. It was on there when I bought the car. Or is there something wrong with my overfill?? thanks