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Re: 92 4.0 aerostar
I would not recommend the R134 conversion. I tried it with both a 89 & a 91 with lousy results. My 95 Aerostar was R134 to begin with. Anyway, you need to find a competent mechanic. Auto a/c issues and test equipment are way beyond most shade tree mechanics. Sound like you have a variety of problems from possibly a bad compressor and a plugged/ malfunctioning heater system. Take it in or live with it as is.
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