Water pump
From my recent experience, I would replace at 75K miles. Mine just failed at 92K - but the troubling part was no warning..no noise, no leaking, no warning lights, nothing. Just a thump when the shaft broke and the s- belt flew off.
I should post a photo - the shaft broke and the plastic impellers were completely shreaded.
Good news is less than $200 to replace (ebay $106) and a DIY project. The hardest part was getting the plastic shield off the bottom of the car.
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