I have a 1997 ford expedition and its a 2 wheel drive with a 4.6 engine .. my proble is that water is leaking and i believe its the radiator , and i have to keep putting water .. then in the inside of the expedition the windshield gets foggy and i believe its the water that is being evaporated . my qhuestion is what can i do to fix it and why is this problem occuring ?? this is the third time this happens usually we just take it to the mechanis and they fix it but after a year it starts again..