My truck will dump all is coolant when the engine is cold. It will hold the coolant while it's running but as soon as you shut it off it will dump coolant. The coolant is dripping out of the front bottom area of the engine and pouring out behind the engine. I have no idea what could be doing this unless I have two different leaks. FYI you can sometimes smell the coolant being burnt off when running the truck hard.

 

Have you crawled under to investigate further? Maybe get to your mechanic if you are unable to get under on your own.