good evening and thank you for inquiring with JustAnswer. The reason it is blowing out of defrost in all modes is because the system is in default mode. This happens when the control head is not recieving vacuum from the engine. Likely the hose came loose by the intake manifold where it attaches to the intake, the hose itself udehood is dryrotted or cracked, the in-line vacuum connecter underhood could have pulled loose or possibly under the passenger side dash right behind the glovebox the connecter could have come loose. Please inspect these spots,as well as underhood listen for a hissing sound with the engine running as this is also a good indicator of a vacuum leak.
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