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The very first thing you need to do is to check for fuses or
say faulty fuse. Secondly check fan which starts along with air conditioner, it
might be manually switched off or the fan may have been clogged. Also reason
can be lack of refrigerant - charge your air conditioner with refrigerant. Last
thing you need to check is cooling coil - the cooling coil may freeze if there
is no refrigerant in the system.
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.
The large fuse you checked is for the rear fan blower motor. The fuse you need to check is for the fan motor relays and rear mode control motor. It is fuse No. 3 (7.5A) located in the driver's under dash kick panel fuse box.
If fuse No. 3 is blown and you replace the fuse and it blows immediately, you'll have to check the five relays and the mode control motor all located near the rear A/C unit in the right aft sidewall. Most likely, the mode control doors have become jammed and that is why the fuse blows. The doors shift air from overhead vents (cool) to floor vents (heat).
If the fuse is fine, the trouble is probably with the blower motor itself or the wiring to the blower motor is broken, or there is a bad ground.
There is a service bulletin for this problem which replaces the blower resistor and connector. Mine had the same problem while on vacation. No fan speed control, and when it did work, the fan would keep running after the vehicle was shut off. Mine is currently in the shop getting the service bulletin installed.
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