94 cutlass problem

hi! sorry if i screwed up. i'm new to this.
i'm trying to find out what is wrong with my moms car. it is a 1994 cutlass supreme. ac only comes out the defroster vents and floor. no matter what setting the buttons are. i would like to fix it for her but i am lost. can anyone help?

Check for vacuum leaks. Pretty sure the controls are vacuum controlled. Check all hoses under hood and dash.

there is a vaccum tee that tends to break, and it seems to be the usual culprit. Look between your battery and the cruise control servo. There should be a small cluster of vacuum hoses there connected to one tee.