If the belts are in decent shape and properly tight they won't slip unless the loading is tremendously above design, such as with a locked compressor. Both senarios you spoke of could happen if either belt were loose. If it were the alternator then it would also squeel after starting the car with or without the AC on.
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Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician
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