How do i tell if the water pump is locked up or if it is the water pump pulley?

1999 MERCURY COUGAR
250,000 MILES
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ADAMEPROUD46
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The pulley doesn't turn but i know the timing chain is fine because the car runs. I tried to replace the belt and idler pulley before i realized the water pump pulley is not turning and that is the cause of my belt burning up.
Aug 3, 2012 at 11:17 PM
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.
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