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I saw Bembo's post about replacing the water pump. How do you know it's gone? Mine seems to be making rattling noises, but it's pumping (coolant visisble from the bleeder tube at expansion tank), and there are no leaks. Without engine running, I pulled the belt off and spun the water pump by hand. The sound was consistent, but I'm not sure it's the source. I was surprised though, that there was almost no resistance. Any guidance appreciated. I have a high mileage 06 750 out of factory warranty, but I have an extended 3rd party variety that covers water pumps (but not thermostat's, electronics, etc.). Thanks.