Ford Repair: 99 ford taurus, ford taurus, metal tube

Question
my heater is not blowing out hot air at all the radiator just got flushed the thermostat just replaced and the heating core seems to be working fine what do you think the problem might be

Answer
is both heater hoses hot-the metal tube for heat on engine gets clogged internally tube will fill hot because it doesn't take much heat on that side to get it hot but the hoses at the core will usually tell they both have to be hot if one is much cooler core is clogged-

blend door actuater may not be working under dash which opens door inside car to let heat in.