Re: cooling system question
If not just a weak hose , must be a vacuum causing it to collapse . Could try bleeding cooling system .
Here is another suggested solution ,
"The hose may collapse when there is a vacuum in the cooling system. Another cause could be a faulty radiator cap. A radiator cap works to maintain a constant pressure in the cooling system. As the antifreeze mixture begins to cool after engine shutdown, a vacuum is created. If the pressure cap doesn't equalize this pressure, a radiator hose can collapse. The small vacuum valve in the radiator cap may not be working properly. "