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Yes if they shorted out something while working on it, it can blow fuses since the fans and horn both went out I would start with checking all the fuses related to these you also may have relays which can go out like fuses some will be under the dash and you might have more under the hood. start there if you find blown fuses and replace and they blow again then you have a loose wire or short.
i have been having that same exact problem with my 2002 grand prix for over a year now, and when my ac is on the lower setting the it doesnt work plus the headlights and lights on my dash go out. On Max everything works. i changed the blower resistor(about $35), still doesnt work. i changed all relays and fuses related to the ac, still doesnt work. i changed out the actual ac control switch in the dash, still doesnt work. i have changed everything but the blower motor and have asked every mechanic and auto parts retailer i come across and no one knows the answer. The best answer i got is that it is probably a wiring problem like a short somewhere.