Timing belt/waterpump
usually a good time to change it is at about 100,000 miles. change it before it becomes a must or not ride(type of thing). if your water pump is run by your timing belt, then yes you should change the water pump when you do the timing belt. the tension from the new belt will sooner than later kill the bearing in the old water pump and it will cost you twice to fix it versus the one time fix. when you go in to the shop there should be no additional cost to replace the timing belt because it has to come off to replace the water pump.
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