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 - A Cautionary Tale - by Ian Minshull. In the early 1950s my father bought an Allis Chalmers B and I used it for all the row crop work with the mangolds and potatoes, rolling and the haymaking on our farm. The farm and the Allis were sold and I have spent a lifetime working on farms throughout the country. I promised myself that one day I would own an Allis. That time event
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