Pump installation

What a drawn out struggle it’s been. My initial idea of both expansion tank and pump on on board did not work. Could not get trapped air out and pump cavitated. Ho hum, drain down, demount, remount on separate board. Shorten rubber tubes feeding. Refill system. Could get most of the air out with pump in new, lower location by twisting and bending the 20mm hoses. Hurrah, temperature stable. I’ll add an air bleeder at the top of the loop, change the anode (not even a nib left of old one), refill with antifreeze, test run, have a day off, go for a walk etc…