89 Taurus SHO with electronic climate control system. I have some heat but not much. I have flushed cooling system and replaced thermostat. I ran self diagnostic test on electronic climate system and found no error codes. Hoses running to and from heater core feel to be same temperature. Does anyone have any suggestions on how to proceed from here?

Have you by chance, recently changed the coolant/anti-freeze? Sounds as though there may be an air lock in the coolant system if you did have it changed.
Hope this helps and good luck

Ian

Could possibly be:
Bad control head (EATC) or bad blend door or blend door actuator.