Hi,
When the engine is at operating temperature and heat is turned on, do both heater core hoses get hot? If they do, then it has heat in the heater box which is likely being prevented to enter the cabin by the blend air door.
First, confirm the hoses do both get hot. If they do, locate the temperature door motor (blend door actuator) under the dash and remove it. With it connected, see if it responds when you switch the temperature control from hot to cold and back.
I attached a pic below showing the actuator's location.
Also, here is a link that explains how in general to replace one. You may find it helpful.
https://www.2carpros.com/articles/replace-blend-door-motor
Let me know what you find.
Take care,
Joe
See pic below.
Image (Click to make bigger)
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Wednesday, March 2nd, 2022 AT 6:35 PM