Hi I have a 2001 ford explorer  that is over heating  and I don't no what is causing it I just replaced the radiator on it and the water pump and the thermostats on it to an it was fine for a few months then my girl friend was driving it to McDonald's one night witch is only like 1 mile from we're we live and it started over heating so when she pulled over and opened the hood the resuvor cap blew off but she said the engine was hot but like not we're it was smoking or anything she said it wasn't even bubbling out the radiator cap or anything  so we got it home and it set over night then tried driving it agian and it did it agian so we let it sit a few days and then tried it agian this time it didn't do it anyway long story but I'm on house arrest so can't realy go check it out but I don't really no much about cars anyway so if anyone could please give me some advise it would be great thanks for any help