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Empty cooling system and reverse flush the heater core with water hose till water comes out clear. Then reverse procedure till water is clear. Fill system with water and turn car on, while car is running open drain plug and continue to keep radiator full while draining it at the same time turn on your heater with heat on high and blower on high When water is clear flush system and wait for engine to cool down. Refill with antifreeze and turn engine on, check for leaks and to see if you have heat. If still no heat change heat core.Let me know how you make out.
It sounds very much like the heater control door (inside the heater box) is sticking in one position or the other. It's intended to direct air through either the AC's evaporator or the heater core, depending upon whether you want heat or cooling.
Assuming (highly likely) that the control door is vacuum-operated, you may have a vacuum leak anywhere from the engine to the heater box inside the passenger compartment, via the heater control unit.
If you have changed you said the olny thing left would be thr thromostat is not opening for some reason Then no heat would get from the engine back to the radiator But im supprised that your not having a over heating problem What dose the engine temp gauge read when the engine hot and idiling
The thermostat is located in a housing on your engine that the top radiator hose connects to... but it isn't tied to your heater problem. The thermostat restricts coolant flow until the engine warms up, but doesn't control the car heater.
You may have a fuse issue if the fan isn't blowing any air. That's an easy check and fix. Autozone might check it for you.
I hope this helps... Good luck.
sounds like you may have an air bubble trapped. Try loosening the radiator cap & running the engine at 1500 rpms till the thermstat opens & see if you can "burp" the air out. You may lose a little coolant this way. shut off car & recheck coolant in radiator and reservoir bottle. Just because reservoir is full, doesn't mean radiator is full.