Spring in bottem heater hose

HI I'm new here so bear with me on my writing form and whatever needs improvement! I remember talking to a Goodyear hose engineer alot of years ago about wanting a bottom hose with a spring in it. He told me I didn't need it, explaining they only put springs in hoses going to the car assembly plants-further explaining that the only reason they were put in was to speed coolant fill on the assembly line-the system was evacuated creating a vacuum. The spring holds the lower hose open for the quick pressure fill of coolant. Once the vehicle is off the assembly line the spring has served its purpose. I also found this written in print in the 1997 Goodyear Belts & Hose Book on page 643. Hope this helps anyone who was wondering! I have some knowledge of Goodyear part numbers and old application books. Hopefully I can help a few people out. Myron