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When the shop recharged it did they vacuum out the existing contents? In climates where vehicles see hot-cold-hot-cold (like in Northern Indiana) oxygen and water can form in the AC system. Then when people buy the bottles of R-134 from Walmart and charge their systems nothing happens, and the compressor kicks in an out or not on at all. Adding a charge may not fix your problem. A full vacuum needs to be applied (this is when they do a leak test) then a full charge. Just got done doing this on my F-150 and will do the same on the X5.
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