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i found if the entire system is flushed the system will cool very good.
going down the road all three 240s = 1986, 1985, 1985, blow 40 degrees at the vent. sometimes high 30s. with r-134.
i have pusher fans on all three.
in the city your looking at 50 degrees at vent.
the complete flush (evap coil, cond coil, lines, new drier. seems to be the key. i have seen brown/black stuff come out.
also i remove the evap coil and clean all the gunk off. also clean condensing coil with degreaser.
this is in south fla.
i have dont it without complete flush with poor results.
thats my experience. good luck
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