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AC Problems.

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Got 2 CHU’s having the same problems. Both Ac will freeze up. I had a problem with the drivers messing with Freon. So now they are gone I replaced driers and expansion valves pulled vacuum an charged 3 lbs. one truck the low side line will freeze from compressor to expansion valve. Doesn’t seem to be cycling. The other truck cycles but freezes the core. Does these trucks have a freeze switch like the older ones? 

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