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It sounds like your thermostat is stuck closed. Your thermostat also acts as a heater valve to let hot coolant go to your heater core to blow hot air if your thermstat is stuck close it prevents your coolant to run through your radiator to cool down and to blow hot air from your heater core. A way to check to see if your thermostat is working while its at operating temp feel the bottom and top radiator hose if your lower hose is cold and top is hot your thermo is stuck closed but be careful hoses might be very hot
You might have a bad thermostat, you might just be low on coolant, and check the actual radiator, not the plastic overflow tank. If both of those are fine, you could have a restricted heater core, you can check that by touching both heater core hoses, if one hose is hot and the other isn't, then it's clogged.
Sounds like a air lock in interior heater core, remove one heater hose under hood and make sure you have flow through heater core. Some vehicles have a valve that controls coolant flow through heater, check on hose for that if no coolant comming out of inter heater hoses.
you can change the thermostat. there are two hoses coming off the radiattor. one goes to the heatere core and to the engine block. the one to the block has the thermostat. take the old thermo and boil it in water. if it open up it is not the thermo. the next likely reason is th heater core. Please let me know