upper radiator hose
so just recently i was giving the engine a little tune. while i had it running and it got to operating temp (160 degrees) i heard a loud clicking coming somewhere between the upper radiator hose, the thermostat, and the heater hose from the intake. after looking closer, i noticed that the upper radiator was collapsing. ok, i replaced it and its still doing the same thing. and also too, when i shut it off, you can hear all of the coolant rush back into the radiator and when i had the cap off to fill it, every time you heard that click, coolant came gushing out of the radiator. would i ultimately fix that if i get a hose with that spring inside?