You may have a blocked heater core. you can try flushing cooling system if that doesnt work replace heater core.
Well your down to either the heater core, but that usually leaks when they go bad but it could be clogged up. Do you have good return flow from the heater core? The 2 water lines that go into the firewall are your supply and return hoses, check and see if they are both getting warm when the car is warmed up. If they seem ok then the diaphram in the vent system that switches to cold or warm air may not be working. Check under the dash and see if any vaccum lines may have come off the control unit or the diverter.
There is not much left that I can think of.
The heater matrix is blocked or the operating flap on the heater unit isnt working ,check the vacumn pipes from the inlet manifold to a box device that holds a vacumn and sends a supply to the vacumn operated control devices that open the flaps on the heater
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