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6.4L overheat

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Hello everyone! Just wondering if anyone out there has had a new 6.4 water pump fail?

 

Reason i'm asking is had a 2010 6.4L come in with a lack of heat thermostats and EGR cooler done 5,000km ago. Pulled thermostats, found one had come dislodged and was crooked in housing, front cover pitted so replaced thermostats, front cover, water pump. First roadtest I had coolant vent out of degas bottle, which had never happened previously, so replaced the degas bottle cap and retested that's when it overheated, with no cabin heat. Vacuumed system no help, Pulled heater hoses off at plastic tube RH of engine, no flow... pulled hose off top of EGR cooler that goes to degas bottle and reved up engine, with no flow coming out of that either...

 

Just haven't came across a 6.4L with spun water pump impellers like the 6.0L before but don't know what else it could be.

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Got it tore apart today and sure enough, the water pump impeller is just spinning freely on the shaft, whether it contacted the front cover then broke loose or broke loose then contacted the front cover is unknown.

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