[aletha]

I have a 97 ford taurus 3.0 130,000 miles and no heat I've had heating core replaced, system and core flushed and back flushed with regular garden hose after that and yesterday the thermostat replaced but I only have heat when going above 3,000 rpms and it is warm not hot. Only other things can think of would be water pump but car isn't overheating and consensus has said its not likely, electronic blend door problem or the steel lines between the engine and heating core are clogged though this doesn't sound likely either.. I can check the blend door to atleast rule that out but i have no idea as to how... can someone please assist me? I'm a single mom who knows nothing about cars i'm just trying to get this fixed so i can drive my kids around wout freezing or worrying about vision impairment because i cant defrost my car.. please help me figure this out?