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you have a leak and if you can hear it or smell it its a good one, most likely its a connecting leak where ever the components connect to each other. with an internal seal leak, such as compressor or evaporator, your freon will last about a month,with a external connection leak, your freon last a couple days
The front seal on the AC compressor is very likely the problem here. It can leak with no apparent signs of leaking like older R12 systems because the oil used in the R134 system is synthetic and it evaporates.
I'm sorry you have had such bad experiences with the shops. I would have stopped at the second one and forced them to fix it at their cost. I doubt you will be able to find the problem yourself, but I understand your hesitation to go back to another mechanic. I will be happy to try to walk you thru the diagnostic process but it may take a few days. First, do you know if the system is full of freon ? If it is full, do you know if the compressor is running when the ac is switched on ? The first shop should have discovered the blown fuse once they charged the system unless it took a day or two for the fuse to blow. The second shop that put the compressor on should have found the faulty fan, and the leaking hose if it is in fact leaking. So should have the third shop. If the compressor was faulty, and the system had been empty for a time, the hose could have started leaking once the system was being used. The pressure on the high side is over 200psi when the compressor is running. Let me know where you want to start with the diagnosis after you answer my questions.
If the noise started after you added the Freon, then it perhaps is your AC clutch. Normally if you have an automatic AC system, then when the Freon gets low, the auto system will not allow the AC to engage, only allowing the fan to circulate outside air. In order to add Freon to the system, the AC lock out has to be over ridden, in order for the compressor to **** in the Freon. This in turn engages the AC system so that the clutch engages, thus engages your AC system. The clutch bearings may be at fault.
YOU HAVE A LEAK SOME WHERE YOU PROBABLY GOING TO HAVE TO PUT DYE AND R-134 REFRIGERANT IN SYSTEM.LOOK FOR LEAKS WITH A BLACK LIGHT.THE DYE WILL COME OUT WHERE LEAKS ARE.THE BLACK LIGHT MAKE LEAKS GLOW SO YOU CAN FIND THEM.HEY IT ALSO COULD BE LEAKING AT THE SCHRADER VALVE.