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If both heater hoses are hot going into the firewall then you have a HVAC issue as in blend door actuator or blend door itself.. Can you see if the blend door actuator is moving?
Not sure if you have single or dual controls so click >>HERE<< to view all them. If the blend door actuator is moving then the door is broke inside the HVAC and the dash and HVAC will need to be removed to replace the blend door..
I sent the actuator removal directions to you can access the actuator to see if it's moving