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963 ac vaccum on low side

Long story short blew the low side hose going into the compressor two weeks ago replaced hose and ended up replacing condenser as it was rotted out. Pulled a vaccum charged system and with five cans of freon my pressure was 150 and -20.... fast forward two weeks have replaced drier compressor one fan motor and expansion valve have blowed thru the system and am getting the same readings I'm lost my Mech is lost I'm ready to set it on fire plz help

21z0485 1992 963