loosing coolant

[milkman4282015]

Thanks guys for all the info! I checked everything that yall sugested except testing under load. I fololowed that truck one day across I88 and it seemed to blow alot of blueish white smoke for quite a long time and i asked driver if it did this alot. Oh ya it does it quite a bit, like its going through a regen. after that i talked to a few more knowlegable mechs and they sugested to change egr cooler so thats my project for this week. keeping my fingers crossed this is it!!