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Change the thermostat. Follow the top radiator hose to the engine. There is to T stat. That will get your heat back. on the defroster, it doesn't blow out air? doesn't switch vents? or just not get hot? Year make and model please.
Is it leaking antifreeze underneath the engine at all when it sits overnight? If so I would say the water pump is shot. If it isn't leaking, it could still be the water pump but it might(hopefully) just need a new thermostat. And driving it when it's hot like that to the point where it starts to run rough means you run it too much like that and your engine will blow up and there is probably already damage. So check it out before driving it to much more.
You may have a thermostat stuck open,Have it replaced.on older cars the thermostat would stick shut and people would burn up there engines.Now they make them stay open when they fail so you dont overheat your engine and blow it up..
yes if its not full of coolant it wont blow heat... let it cool down, fill it with coolant, start the vehicle with your defroster on, all the way over to hot, and on high, watch the level of the coolant, when the thermostat opens, the coolant will be sucked out of the radiator, top it off, after a few minutes you will feel heat.