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03 Jeep Liberty defrost blows only A/C cold air

So had heater core replaced and ever since then, heat only blows warm air on every setting except when turning knob to windshield defrost that literally only blows cold AC thru it regardless of if I turn the knob from cold to hot it doesn’t change anything??? Air pocket? Heater blend door actuator? If blend door actuator where is this located?

If vehicle is running at normal temps then I would suspect they screwed up the blend door or broke an actuator .

Yes it isn’t overheating and running fine

So can anyone tell me where these blend doors are located since I guess I’m gonna tear down the dash myself

It seems the first step would be to talk to who ever did the heater core and see if they might have a solution.