When I drive the car & then park it, the next morning the upper hose is collapsed in on itself. If I pop the rad cap, it breaks the vacuum & the hose goes back to form. It is a new radiator, new thermostat, new water pump, new 13 lb rad cap & the car is not over heating although the engine compartment seems hotter than it should be. The air cleaner is almost too hot to touch once the car has been driven a little. I think I may have a circulation problem but I wanted to see if anyone else had seen an upper hose being sucked in. Thanks.