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Did you ever figure out what was making the noise? I have the same problem I think, originally thought it was a bearing in the alternator but listened for the 'tick tick tick' sound using a pipe and found it to come from the tensioner pulley. Replaced the tensioner pulley roller and the lower pulley, and put a new belt on. The noise got better briefly, but its coming back.
Noise gets louder when I put on the A/C, but disappears above idle speed. I really think its the tensioner itself, but before I tear down the engine to get to it I'd love to hear some insight.
Has anyone replaced the serpentine belt tensioner (not just the pulley)? Is it a weekend job or will this be an epic tear-down?
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