Cooling Issue - 1964 Dart GT - 273 with automatic and A/C

The lower radiator hose should have a spring inside of it. Factory installed them to keep the water pump from sucking the hose flat and slowing or stopping the flow.

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'Collapsed rad hose' is largely a myth. The upper hose would never collapse, and the only reason why the lower hose could collapse is if there is severe clogging or restriction in the radiator or thermostat—and the hose would then un-collapse once the system heats up and builds pressure.

I don't claim it can't happen—only that it is exceedingly rare and has one specific cause. Think it over: that bottom hose runs from the radiator outlet to the water pump inlet. The only way for there to be negative pressure in that hose is for there to be extreme restriction upstream of that hose so the water pump pulls a vacuum, and the hose would have to be weak/soft, and there'd have to be no/low pressure in the system as a whole.

That spring that used to come in some rad hoses was meant to keep the hose from kinking if overbent. Cut the hose to length (as required) and install it properly, and have good engine mounts, and there won't be any kinky stuff happening.