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The refrigerant R-134a, often mistakenly referred to as Freon (which is the Brand name for Dupont R-12) also contains the lubricating oil (usually a PAG oil such as PAG 46) to lube the system's internals and compressor. If you have a refrigerant leak, from pinholes in the condenser or at the 'o' rings, you also lose the oil with it.
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.
Cheers!
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