Defrost not functioning properly

This is due to the mode door actuator is not functioning. The fact that it blows on defrost only is due to that being a default position when this actuator fails. So this is a safety feature that is meant to do that so that if it does fail you will always have defrost so the windows don't fog up.

I attached the process for your review. The mode door is number 3. Let us know if you have questions. Thanks