Yeah, could be a handful of things:
Fan bearing bracket, as it's called. This has the hub and bearing that the cooling fan itself rotates on, it also has the idler pulley as part of it, over on the right side (all one housing, although the idler itself I can't remember if it's included or not). If it gets bad enough the fan bearing can fail and cause all sortsa nice damage (fan, radiator, et al).
Tensioner or tensioner shock (as mentioned)
Alternator bearing
water pump
serp belt itself dry or cracking
Gilly
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