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do a coolant pressure test.
Run a pressure test on it.
from the water pump tell tale hole
If there is coolant coming from it and it isn't a hose.
You should able to tell if it's leaking so I assume that you are not seeing any coolant where you park so it's a good chance you got a blown head gasket and the coolant is leaking in your cylinders and being burned off or leaking into your oil. Check your oil after running and if it is foamy it has coolant in it.
Coolant leaking from the heater core.
is coolant leaking from engine?or is it leaking from water pump and running down engine and appears to leak from engine
Water pump shaft loose? Water pump leaking? Water circulating in coolant system?
If coolant is leaking from a car it means that your radiator has a hole in it. If this is not fixed the car will over heat.
Coolant leaking from back? meaning exaust? If yes, then it's a head gasket or cracked head. Will not start because 2 or more sparkplugs are now wet with coolant.
Obviously, there is a leak somewhere. It's possible that it is the gasket leaking, and sorry to tell you that it will be pretty expensive to replace. Without more details of the leaking, I can't tell you much more. When mine was leaking, I was able to get it fixed under warranty. I hope you are as lucky.
Example sentence - The coolant in my car was leaking out.