Hello,
This is probably going to be a problem with your vehicle's blend door actuator. This is the motor that controls your blend door and let's the heat out of the Evap Box to get routed to the vents. Here is a link to general guide on how to replace the actuator:
https://www.2carpros.com/articles/replace-blend-door-motor
In the diagrams down below i have included a guide from the vehicle manufacturer for your vehicle's blend door actuator removal and installation. Please go through these guides and get back to us with what you are able to find out.
Thanks,
Alex
2CarPros
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Sunday, October 13th, 2019 AT 6:50 PM