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Originally Posted by irieite
You might wan't to make sure your cooling system isn't being over pressurized due to a bad expansion tank cap or worse yet, a leaky head gasket.
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Neither of these will cause an "over pressurization", but just the opposite as pressure is lost when a cap is faulty or HG is leaking. In these 2 situations, pressure loss can cause over-heating.
Could that damage a water pump? Excess heat can do all sorts of things, but in this situation it would appear the problem is a leaky pump which happens to be brand new. My $$$ are on the pump being bad. It happens.