2008 Solstice Base Premium-Approx 32K on the clock : I want to drain and refill my coolant. I am having no problems and things are running correct, but I read I should do it at 32k to help prevent possible water pump and seal damage. I have seen the DM Video on refilling, so I'm good there. What I want to know is do I have to do the water-pump/block drain too? Should I even mess with doing it at all?