You could have a bad water pump gasket.
No. they're dissolved in each other and are quite hard to seperate.
your cooling fans are not kicking in. They make have clutches that have gone bad. they need to be replaced. Also check the themostat
The leak would vary on the size of the hole or seal failure.
vacuum leak
There may be a hole in the radiator?
maybe your head gasket
If not tight enough to seal it will leak.
An antifreeze leak.An antifreeze leak.
cap is off
You would have a leak, from either the pipes to the heater matrix (radiator), or the matrix itself.
A leak.
most likely a blown head gasket.