Collapsing upper rad hose...

[Magntik]

Hey guys,
I was under the hood of my '67 Bird with a Pontiac 350 block, and noticed the upper radiator hose was almost collapsed on it self. And after the car sets and cools it'll stay like that until I open the radiator cap.
The car doesn't run any different and I have not been running any different temperture wise.
It's been hot here lately and still 180 to 200 degrees.



Any ideas what is going on?

Thanks

[HILROD]

Check the cap or the overflow hose. Sounds like a clog. I've had cars do it only slightly, when cooling. Never sucked nearly flat.

[Magntik]

When you say clog, where do I look for it at?

[Steve Chryssos]

Do you have an overflow tank? If so, run the line from the rad filler neck to the bottom of the overflow tank and then vent the upper line.

[Magntik]

Ok, up untill now the line in to the custom overflow tank has gone in to the top and a petcock was screwed in to the bottom.
I'll switch the line and vent the top.
Thanks

[Magntik]

Well guys I fixed and didn't even get dirty!!
I stopped by my favorite local parts store where they know me and my car to buy some antifreeze, and the main guy asked if I "sprung a leak??", so I explained what was going on and I was anticipating having to top it off, by time all was said and done.
He told me to wait a minute and walked off, came back a minute or two later with a small box rang them both up then handed it to me. Said try this first.

In the box was a new radiator cap.
I told him someone mentioned the cap, and
asked why would a new cap fix my problem.
He said they go bad too, trust me.

Guess what....$3.99 for a new radiator cap and no more callapsing hose!!

Who would have thunk it?

Thanks for you help guys.