Spring in bottem heater hose
The engineers at Chrysler did realize that under certain high speed conditions the hose could collapse so they included a reinforcing wire into the bottom hose. Unfortunately most people would not maintain their cooling systems with periodic flushings and proper antifreeze. The wire would rust and break off passing on to get lodged somewhere in the system. That`s one reason for not seeing the wire ribs in the hoses much anymore. Secondly, everything is just getting cheaper, it cost more to put the rib in, and the demand is low. I`ve bought one in the last year with the wire but can`t remember where. I bet Year One or the like would have one.