expansion tank

TB, that's sweet.

OP
No, if the entering hose is dumped near the bottom of the tank. I cut them off at 45*, and keep them off the bottom where the mud forms.Yes, the tank wil have to be vented.This will make it a self-adjusting expansion tank, or a coolant recovery tank.
But really , on a slanty around here,I can run the rad near 30% empty, and not overheat. So running the liquid level to just cover the cores, or a little higher, turns the top tank into an integral expansion tank.
BTW, my cooling systems, here in Manitoba are happy running 7psi. Your results may vary. The hoses last for decades.