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It seems to me that all the trucks of that era short-cycle the compressor. One "down and dirty" way to lengthen the cycle is to pull the switch capillary tube out of the suction tube a little at a time.

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I had an '82 and '84, both were lousy from new for A/C. Pulling out the tube even a little led for freeze ups after as little as an hour. By '88 or so the A/C units were back to what I regard as normal operation. NEVER figured out how to get satisfactory A/C performance out of them, except to wait for winter.

Robert