mypaldave

Everywhere I checked said that the cooling system on a 2014 F-150 with a 3.7L has a capacity of 15 quarts.
I drained it, flushed it, and again drained it until nothing was flowing from the drain plug.

Now, upon refilling it I find that it's only taking 8 Quarts of coolant? What's happened to the other 7 quarts?

Thank you