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Heater needs Heater Core, Heater control valve, air diverter inside the car and hot water in the heater core. If you just change the thermostat you must have had a reason. If the car was running hot it could be a radiator clog. If the core is clogged no heat. If the heater core was drained when you changed the Tstat there may be air in it - if so no heat. If the control valve (on the heater hose) does not shift- no heat. If the diverter door in under the dash does not direct the fan air through the heater core- no heat.
If the heater core isn't leaking it doesn't likely need changing. It sounds like you could have a problem with the heater control valve - a valve in one of the heater hoses that controls flow through the hose. If you smell coolant and see moisture on your windshield (inside) or have coolant leaking onto the floor - you might need the heater core replaced.
If the car is not providing heat and thermostat is good, then your problem is a faulty heater core. Sometimes when heat cores wear out, they sometimes give off an anti-freeze smell. You can go to autozone.com and register for full free online repair manual with everything you could need for your car.
Check that the water level is correct in the radiator and make sure the water system is properly bled as if there is an air lock then this can cause the prob you describe and check the thermastat is working correctly by dropping it in boiling water and see if it opens fully.
Make sure the heater control valve is opening and closing. This is likely under the hood near the rear of the engine. There will be coolant hoses connected to it. This valve allows hot coolant to enter the heater. If the valve fails or gets corroded shut, no hot coolant can reach the heater; and you will have no heat.