Heater blowing cold air

Are you sure the blend door motor is working and opening to allow heat?

I attached a picture and procedure for you for this motor.

https://www.2carpros.com/articles/car-heater-not-working

If it is all good, then most likely the temp actuator is the issue.

AIR MIX DOOR MOTOR

Removal and Installation

REMOVAL
1. Remove the driver lower instrument panel assembly. Refer to "Instrument Lower Cover LH".
2. Disconnect the air mix door motor connector.

3. Remove the air mix door motor screws and then remove the air mix door motor.

INSTALLATION
Installation is in the reverse order of removal.

Check out the diagrams (Below). Please let us know what you find.