What's causing my Renault Laguna to screech when I accelerate?

I just bought a Renault Laguna Dynamiqe 1.8 and have noticed a screeching sound coming from the engine when I accelerate - can you let me know what it might be?

Asked on 29 June 2010 by johnnimmo

Answered by Honest John
Probably the alternator. But might be a timing belt pulley.
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