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Removing the belts one at a time won't hurt anything as long as you just run the engine long enough to spot the problem. If you still hear the noise after you remove all of the belts, check your timing belt tensioner. The ball bearing in the tensioner can fail and sometimes make a strange noise. Although sometimes that bearing can fail without audible warning. If your water pump turns out to be the culprit, you'll need a new OE water pump and gasket. Be sure you don't forget to drain the antifreeze before removing the old pump. :roll:
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