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Hello, I am Randall. I have some questions to start, what engine do you have? Did this happen all at once? Is it possible to run engine till you feel it is up to temp and fee each of the 2 heater hoses going into the firewall on passenger side under the hood?
so no heat at all when you set on high temp? just cold air?
do you have dual climate controls?
If you can take the insulator panel under the dash off and look at the actuators while you change the temp and see if they move. Do the heater hose get warm or are the very hot?
Here are images of the actuators.
Do you still need assistance?