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There is an AC thread in my signature...
a good place to start...
Find out if your system has R12 or R134a
You are going to want to put ' gauges ' on it...
to determine if it is partially charged or fully charged and some other problem exists..
it says on the compressor.. R12...but that might not be true this many years later..
so look for new tags which say a conversion has been made... AND look for the different looking access points plumbing..
If it only cools when traveling forward... sounds like your ' air across the condensor' is lacking when not moving forward..
so if you have a fan clutch.. check that.. if you have electric fans check those for operating correctly...
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