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Message: <blockquote data-quote="Shawn Monzingo" data-source="post: 1052710" data-attributes="member: 78567">My son's Honda did this, but Honda had an air bleed valve built into the thermostat housing. This allowed you to release the air trapped before the thermostat. The thermostat isn't opening because it isn't warm enough and that is causing the vacuum, collapsing your hose. You had to open the valve and let the air out of the system and close it when the coolant finally came through.Related only because of the collapsing hose, this happened to a friend of mine on his '63 falcon with a new build 260. He did not put the thermostat in, and the water was running too quickly and caused the same issue. Really bizarre... He had to put a thermostat in and that stopped the issue.</blockquote>