Several times I have helped friends remove their radiator hoses only to find they either cracked the neck or gouged it using screw drivers between the hose and neck/nipples.
I showed them this tool and they said they have never seen before it despite working on cars for a while.
I figured maybe showing it here for those who have never seen it would save time and unnecessary repairs as a result of removing frozen hoses especially if you have a Harrison radiator (very $$$$ to replace).
To use, carefully wiggle the point to slip it between the hose and neck. When it's under then push it around the neck and presto, it's freed!
You can get this at places like Pep Boys for under $10.
Hope it helps,