I had the same problem in my 6.0 liter gas chevrolet engine. coolant was leaking rather quickly. Come to find out my water pump was on the way out.
When the water pump bearings start going, there is a pisser under the pump.
it leaks out. I just kept filling the coolant. but one day there was a nasty squeaky noise. changed the belts, sprayed all kinds of belt crap. Guess what water pump shot. the truck didn't't even over heat. i dont know.. that was my issue. I recommend taking off the belt. On the water pump clutch fan, see if it has play. if so it's shot. I can almost bet it the water pump. go ask the advanced auto guys. they will tell you the same thing, about newer truck water pumps. they piss out fluid slowly to forcast water pump damage..
hope this helps
Also had problems like you stated above a year prior. coolant was leakin slowly.had to put a little in twice a year. then more. then on day that happen above
When the water pump bearings start going, there is a pisser under the pump.
it leaks out. I just kept filling the coolant. but one day there was a nasty squeaky noise. changed the belts, sprayed all kinds of belt crap. Guess what water pump shot. the truck didn't't even over heat. i dont know.. that was my issue. I recommend taking off the belt. On the water pump clutch fan, see if it has play. if so it's shot. I can almost bet it the water pump. go ask the advanced auto guys. they will tell you the same thing, about newer truck water pumps. they piss out fluid slowly to forcast water pump damage..
hope this helps
Also had problems like you stated above a year prior. coolant was leakin slowly.had to put a little in twice a year. then more. then on day that happen above