Sounds like it could be a possible bloked heater matrix try removeing connecting hoses a jet-wash the matrix out both through the inlet and outlet until water flows free. The motor for the temperature door in the plenum isn't working. As you increase the temperature control on the dash, it sends a signal to a motor which opens the door to the heater core. Yours is sealing off the heater and allowing AC or fresh air only.
Thermostat stuck open or heater core clogged. I had a similar problem in feb.2005 with my 1998 S-10 Blazer and it was due to the Dex-cool had turned to sludge , and that caused lots of problems. The first thing to do is after the engine is warmed up, feel the heater hoses going into the heater . if they are hot then the problem is in the heater, probably just adjustment or fuse. If they are just warm to cool then the answer is in the engine, probably needs a thermostat. answer can also be the temperature control switch in dasboard of car
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