HVAC stuck on defrosters
 

Ive been having this problem lately, my car will only blow air through the defrosters. I plan on getting an ac delete so i dont care about cold i just wanna know why it wont come out of any of the other vents. Is my panel broken? I read somewhere that this is vacuum controlled, but i cant find any info on line locations or any other sort of trouble shooting.

please help!! im getting cold feet!!