It needs a new a/c compressor, it is called liquid slugging because of internal compressor failure. There is a GM service bulletin on this and it was really common failure on 03 suv's and trucks.
yup my 04 yukon had the same shit. Make sure they clean out the AC lines realy good before they replace the comp. The dealer had to warrenty the replacement one b/c it started to do the same due to line contamination.
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