2000 Pontiac grand prix no heat working

I've since replaced my radiator(due to leaks
anyway) heater core, my heater actuator and the
fanand motor in my car this still hasn't given me
any heat when  try to use console. Would this just
be my heart buttons failing.   I've checked all the
fuses made sure where good.  Running out of
money to buy parts for the heat in my car to work.  
What am I missing or anything.  I can't afford ship
hence the hit and miss with replacing parts that
needed replaced anyway.  Any lead or help would
be awesome.  I've replaced everything I know to do
with getting heart back in my vehicle.  Getting cold
so if not fixed won't be able to warm up cat in
winter and defrost front  window to drive safely.