thefonz

2003 mountaineer, collapsed top radiator hose, is this just a weak hose? or is there other issues that can cause thiis??
Thanks,
thefonz

R.S.LOGAN

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. "

thefonz

After some more searching, cap and/or bad hose is the most likely problem. Off to the parts store.

goldie1

cap and or hose when not running. Thermastate and or hose when running.

Ian