i have a 1999 ford fiesta 1.4 16v and its started to overheat even on small journy's. Also there is no hot air coming through the vents and i am losing water. i have changed the water pump and the thermostat and checked that there isnt any water leaking anywhere but it still keeps overheating. It hasnt lost any power or accelleration. i'm struggling to find the problem so can anyone help me pls. cheers