Top Radiator Hose Collapses

RichardJ916 said
OK Lets start this off a different way....lets not even worry about my hose condition or Bottle Catch Can OK

1:) Stant Manufacturing #10231 Vented http://www.rockauto.com/catalog/moreinfo.php?pk=48504&jnid=2&jpid=4

2:) Stant Manufacturing #10230
http://www.rockauto.com/catalog/moreinfo.php?pk=48503&jnid=2&jpid=3

If I was to look at 20 Cars today all would have caps with out the word Vented on them. Plus a good buddy of mine has a 70 Duster 360 just like mine and his cap says 10230 right on the top.

I am just trying to figure out what cap to use that is the correct one, or does it matter.

Richard, IF the catch can is not vented and or the tube going into said catch can is plugged, when the system tries to suck the coolant from the catch can back into the radiator it cannot. Which in turn would make the hose collapse.

You said when you release the cap the hose returns to normal, instant sign of vacuum, vacuum is there because it has no venting.

FIX: Make sure the catch can is vented, make sure the hose is clear, make sure the fitting on the side of the fill spout is clear.

Think vacuum cleaner, turn it on and put your hand over the end of the hose, the hose will try to squeeze together, ie; collapse.

It could be something as simple as a mud dauber getting up in there.