Coil, not spring.

If your hose is collapsing, that means the pump is evacuating coolant from the hose that is not being replaced from the radiator. Why not? Because the system has restriction(s) that is/are not allowing for adequate flow-----most likely the radiator, but it could be inherent design restrictions. Best to check for good flow.

If you are familiar with fluid pumps, a hose used on the suction side is very rigid, in order to prevent what we are talking about, but that's an open system---it doesn't loop under pressure like our systems do.