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Welcome! My name is XXXXX XXXXX you for allowing me to assist you! Sounds like the HVAC control head has lost it's calibration with the blend door actuator. Low battery voltage may have caused this. It may be a failed blend door actuator also. Try this: With the ignition off, disconnect the negative battery cable for about 2 minutes then reconnect it. Then set the temp control to midway. Start the vehicle and let it idle for a few minutes. The HVAC system should re calibrate itself. See if all is well after that. If it still is blowing hot, then that blend door actuator has failed, or the blend door itself has failed and then you will need to go to the dealer.
I hope this helps, and let me know if you need further assistance with this.
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