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I would straight down onto the belts and see if they have a slight turn to them as they get near the alternator, the power sterring pump and the AC. I think it may be the bushings that mount these units to their respective brackets. The slight misailignment does cause teh belts to sqeel sometimes. With the weather changing colder (where I'm from anyway) it could cause these symptoms to crop up on both cars, same time.
I have 158K on my '89 200, and I did my bushings 4 months ago. Before I did it, I would loosen the pivoting bolts and tweek the alternator straight then tighten it down...It works for a while.
PS With 158K, I have not replaced my water pump or anything else and they are still running quiet. I'm guessing belt issues.
Put some kitchen soap on the belts and see if the Whistle stops. that will eliminate bearing noise if it does.
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