I can't even imagine the hate mail I'm going to get for this, but here goes.
I was down on bucks and time once to the point that I couldn't afford to fix
a coolant leak on a Chevy pickup.  If it is truly a small radiator hole, get
yourself a box of black pepper and pour a couple handfuls into the radiator
while the engine is running. Don't be stingy with it. It will most likely
fix the leak within a few miles as it did my old Chevy truck.  Now, what
you_should_do, is try to scrape up the bucks to either have the radiator
repaired or replaced.  But the pepper trick worked for me and was still
holding when I got rid of the truck a couple years later.  Never overheated
or plugged the radiator. Hope this helps.

Garrett Fulton