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Typical symptoms could include pump noise, pump leaking coolant through it's weep hole, or engine overheating. Generally when you replace the timing belt, you'll want to replace the water pump while you're around the area. This is certainly not a rule, but in my experience 100k miles is a good lifespan for a water pump.

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Q: How do you tell if the water pump is going out on a 1989 Mercury Grand Marquis?
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