Stay away from dye and stop leak,they will only cause more problems. You don't need much pressure to find a leak that big. In fact,high pressure through a large leak can blow soap off without making bubbles. Use refrigerant or nitrogen to put 50 pounds or so pressure in system then go over everything you can reach with bubbles or soapy water. Do not use compressed air,you will never get all the moisture out later. If that doesn't find it,borrow a sniffer from a auto parts store. Again,the system doesn't need much refrigerant in it while tracking large leaks. Check areas you couldn't reach with bubbles.You don't need to have access to evaporator,just find a way to get sniffer inside evaporator case and there will be plenty refrigerant concentrated inside case to set sniffer off. If possible, have an expert change drier,evacuate and recharge. You can borrow vacuum pump at auto supply if you want.
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Today's Featured Article - Madison's County - by Anthony West. Philip Madison has been a good friend of mine for quite some time. He has patiently suffered my incessant chit chat on the subject of tractors for longer than I care to remember, and on many occasions he has put himself out, dropped what ever it was he was doing, to come and lend a hand cranking handles, or loading a find onto a trailer. Although he himself has never actually owned or restored a tractor, he was always enthusiastic and always around helping with other peoples projects.
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