The radiator in my girlfriends Camaro is a total wreck; it's leaking from
multiple places and needs to be replaced. I've never worked on the car
before and know nothing about it; still not too big of a deal, except that
there is a whole below the cap facing the engine a little bigger round
than my thumb; it looks notched on one side (towards the center of the
car). Long story short it is open to the world and I have no idea what
belongs there, does anyone know?
Thanks in advance for any help