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Thanks Jager for clarifying on the brand of the waterpump that failed so rapidly. While we will never know whether the Porsche part would have lasted longer or not, I am certainly planning on replacing mine with the factory part when the time comes. And yes, I have decided that I will not replace the pump until there are signs of failure, in spite of the urgings of some others.
In the interim, I am careful not to open the coolant expansion tank when the engine is warm as per Pedro's advice. When I replaced my serpentine belt this spring, I checked out the pump for signs of leakage or play in the pulley and all seemed good. There is also no discernible bearing noise when it is running. I also decided not to replace the lifetime coolant as, it strikes me that if there is a problem with the bleed, I am more apt to cause an impeller failure than if I leave well enough alone. When (or perhaps if considering Pedro's waterpump life) I need to replace the pump, then I will have the system flushed and the coolant replaced. I am also holding off on replacing the thermostat with a 160 degree unit for the same reason. Until then, I am leaving well enough alone.
It might be interesting to see if those who suffered early pump failure had previously had the system flushed and coolant replaced, or had required replacement of the coolant expansion tank, or had replaced the thermostat, or had been opening the coolant expansion tank when the engine was hot. Furthermore, if the system had previously been bled, what method was used.
Brad
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