Well...put it all together and did a complete system flush. Thought why keep flushing the heater core and have the rest of the junk in the system plugging off the core. Found that the pump was not as good as I thought. After flushing the pump seal was shot. Must have been enough junk in it to keep it from leaking. Off the the parts shop in the morning for a new pump. Hope it works....forecast is for -35C for Tuesday.