Hello,
This is probably a problem with your vehicle's blend door actuator. The actuators are little plastic electric motors that operate the doors that open to let air through the ducts. When your actuator, through normal wear and tear brakes, it is going to stay in the position it was in when it brakes. Here is a link below for you to go to:
https://www.2carpros.com/articles/air-vents-stay-in-the-defrost-position
Please go through this guide and get back to us with what you are able to find out.
Thanks,
Alex
2CarPros
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Tuesday, July 30th, 2019 AT 11:50 PM