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Usually people check everything, change the thermostat and forget to check if the cooling fans work? The other possibility is that the water pump is failing.
The simplest thing would be if there is a big air lock in the system and the water isn't circulating properly. No heat coming out of vents is a symptom of that because the heater core is high up in the system behind the dash. Read this Tip I wrote. Raising the front of the vehicle is important to fill the heater core as well as putting heating on MAX.
there is a valve in one of your heater core lines in the engine bay that controls the flow of the hot engine coolant to the heater core and is controlled by the hot/cold selector on your dash by a cable. have someone watch the valve while you move the selector back and forth from hot to cold and make sure it's moving the arm on the valve.
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