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You could have one of many things happening.
A loose exhaust heat shield is easy to find, tap away at the pipes from underneath with a rubber mallet.
You could have a bad water pump, as you mentioned, or a crapping out idler pulley.
You'll have to pull off the serpentine belt to check.
Good luck with your search.
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Six speed 2000 Boxster S
Arctic Silver on Metropol Blue | LN Dual Row IMSR | Arctic Silver console, spoiler frame & bumperettes | Crios mod | Technobrace | RoboTop module & modified convertible top relay for one-touch roof operation
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