A water pump in itself WILL NOT cause and engine to overheat, if it leaks badly and the coolant level drop very low then this will indirectly cause the engine to run hot or overheat. What I see in the video clip is NOT overheating, the fan doesn't come on until the engine reaches about 230 Degrees Fahrenheit, that is pretty well up about where the needle is in the video, if the cooling fan never kicks on after about 20 minutes of idle or doesn't engage when the AC (this assumes the AC is working)n issue.
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