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It is rare for a water pump to stop pumping, even if they are leaking, they are still pumping as long as the belt is there and tight. I would change the thermostst first. There are a few water pumps out there that have a plastic impeller and I have seen them break apart but that is rare.

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Q: How can you tell if the water pump needs to be replaced or if its the themostat on your jag s-type?
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