Have the heater temperature control blend door actuator checked, that is the usual problem, the actuator moves the air temperature control door that moves back and forth to supply hot and cold air or a blend of the two air streams from the heater core and the AC evaporator core, I have changed out about a dozen of them for this problem of no heat, the actuator is located behind the glove box to the left on the air duct, it has a small electrical connector going to it, very hard to get at.
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