'98 Mustang V6 A/C blower

Help! my 98 mustang v6 was vandalized last week. some##!#@ broke into the car, in my driveway, sat inside and took his sweet time to remove the nice radio upgrade I had just put in. Luckily, ugh, the thief did not break the dash. Since then, the blower speed button on the a/c only works on high. I turn the a/c on, and must turn the blower button to high or nothing comes out. Does anyone have a suggestion for me on what may be going on and maybe a fix?

thanks to all.

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