Hey Steve, sorry, just saw this now.

While waiting for the whistling to get worse so I could pinpoint it, my alternator died.

So when I replaced the alternator with a new Valeo, I also replaced the alternator belt tensioner assy with pulley (LUK), A/C belt tensioner assy w/ pulley (LUK), and the idler pulley (LUK), along with the main belt and ac belts (Continental).

This particular gaggle of parts I bought in Hong Kong, of all places...they were cheaper than what I could find on-line.

FCPEuro has good prices too, Pelican, Turner and ECS are all reasonably priced too.

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04 X5 3.0i auto
03 X5 4.6is