2000 ford taurus no heat?

I try everything I flash it, I change the thermostat, and add new coolant I check the blend door, and the heater core is ok check at ford dealership and I don't know what is wrong with the heat

Either the fan isn't working or the main air duct is blocked.

If you are sure there's no airlock in the heater pipework I expect the heater matrix is obstructed with sludge. Or the operating valve is not moving.

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