Knowing the YEAR would help answer your question a little better.
Check these things : Water pump, INTAKE MANIFOLD GASKET, And there could be a heater hose fitting screewed into the front left corner of the intake that could be leaking. That's you standing in front of the engine looking at it. There is also a Freeze plug that is hidden on the left front side of the timing cover that could be leaking.
Possible leaking hoses or water pump
your heater core is leaking
usually caused by a leaking heater core.
fix it
Find the source and repair it.
enough to keep it from freezing.
If it is a vortec engine, it is probably the lower intake manifold gasket. In most cases you can smell it when the engine is hot.
Yes it will, there the same.
That is because it is hot ( over heating ). You need to check all 4 corners of the intake manifold with your fingers to see if it is leaking antifreeze. Chevy had a problem with the intakes leaking engine coolant. There is a heater hose fitting screewed into the left rear corner of the intake and thay are none for leaking engine coolant too. You should check the water pump for leaks too.
change out your wheel cylinders..
Leaking radiator? Leaking or loose radiator hose?
you can but you shouldn`t...use only dexcool.