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^^Right, but say it was still R12 and then you had it converted & charged with R134a without completely purging/cleaning the system, servicing the compressor with fresh PAG or Ester oil & replacing the filter-drier, then that could be your issue. R12 and R134a are not compatible refrigerants and may cause your lines to clog...
You also have both high & low pressure switches in the system- If the system was OVER-charged, it will kick off just the same as if there were not enough. Did the shop that charged it put a vacuum on the system and make sure it didn't leak before charging it?
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