Re; Heater blowing cold air

97-350 7.3 diesel Super duty Heater blows cold air, changed the heater core, no change. Engine runs at operating temp fine, fluid level is good. must be a problem somewhere to do with?
-15* here (yes)
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Expediter wrote:

Blend door actuator (BDA) is probably broken, or the EATC control head is bad. Do the built-in diagnostic (look it up) for the EATC.
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