Definitely replace the water pump. The OEM has plastic impeller blades. I put in a new one with steel blades. I replaced the thermostat and the two radiator hoses at the time too. I also replaced the temp sensor as it is cheap. The parts are not very expensive on line, and will help prevent a roadside breakdown. I then poneyed up and bought the expensive but excellent BMW antifreeze and did the full drain and replacement of the antifreeze.
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