I think Quickurts theory seems the most plausible. Now where to get some Ripley...
I don't think it's the air pump since it only happens sometimes and it's definitely a whining sound. The people at the dealership heard it and the first thing they thought was the Freon.
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But, I'd be surprised if this is the culprit, though it may well be. Before making the diagnosis that it's the refrigerant oil, I'd want to rule out the bearings on the idler pulley, alternator and the compressor. Especially if you've not noticed any drop in efficiency of the AC, this is the more likely source(s) of your whine.
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Even if it's only for a few seconds on startup? I thought if the bearings were worn, then that sound would eminate throughout the drive.
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