ddndoug X1
I have a hotshot A/C tech down here, who insisted on disassembling my old compressor 'To Find Out What Went Wrong'. If he had found debris it would have been new-compressor, new-condener, new evaporator, and new expansion valve and drier. I would have been getting my parts myself so it wasn't a sales job. The compressor oil was drained and it was clean. The problem was a seized valve. Bad or low lubricant from Nippondenso.
I ordered a new Nippondenso compressor and receiver dryer and it is sitting by my feet.
The point being: Celso, glared at me hard, when I told him what the OP's shop had done (the 40-amp fuse): "¿Son Locos?" needs little translation.
My advice is to bite-the-bullet, find a reputable auto HVAC shop and get it done right. Dollars to nickels they'll find other problems and fix them and your dash unit will blast you out of your seat (like it did when brand new). Your unit works with vacuum controlled flaps, isolating heater and airflow, and someone who endangers your electrical system, is burger-flipper grade.
Jeezo, if I can find competent air conditioner repair down here, it should be a piece of cake up there.