About two months ago my 2002 kia spectra overheated for the first time. Last week i changed the thermostat and radiator cap because antifreeze was leaking from top of radiator. the radiator was also bubbling from the front top left side. i got a tune up because my car has been dragging bad and has been shifting into gears slowly jerking. two days later the heat went out n my kia only blew cold air. the next morning my car overheated for the second time and cut off as i was driving. it also has been making a high pitched ticking noise from the passenger side of car. I want to fix my car rather then junk and get another. I believe it could be head gasket water pump radiator n thermostat but which one would cause my kia to not start up? thanks.