1996 Ford Explorer blowing cold air replaced therosate and full of 100% antifreeze

Feel the Heater Hoses at the Firewall when engine reaches operating Temp. (CAREFUL: HOT). They should be about equal in temperature. If not, the Heater Core is clogged. If equal, then it probably is the Blend Door or Blend Door Actuator (typical) & needs to be check or Replaced

Thanks for the info husband had heater hoses connected backwards

Great...

Does a 2000 saturn have a blend door, are blend door acuator