I had a water pump go bad. Oddly it didn't leak but the pulley got so warn it twisted, and the spinning part (the pulley) was gouging into the aluminum body of the pump, making a very interesting growling, grinding and sometimes high pitched sound. Just in case anyone was thinking about noise, checking the belt isn't too hard and should take ya 20 minutes even for a novice, and those are things that can be checked visually.
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