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it's been a while, but i think i went to a local parts store and just bought a cheap hose the same size, ripped the spring out and put it in mine. i have the reproduction hoses though, so wanted to keep those.



Exactly what I did. My car ran cool in traffic, but I could watch the temp rapidly climb on the highway. Friend suggested that the lower hose was collapsing at speed and to install a spring in the lower hose. Robbed one from a parts store hose, installed it, and the problem went away immediately.



although from the previuos post i'm wondering if it is time to check and see if it is still in one piece!