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Low on coolant, blowing coolant out the degas bottle or using coolant? The min line on the degas bottle is normal and where it should be, let us know which of the above you are seeing.
Park truck over night so front is slightly down hill, in the morning pull EGR valve and check for wetness, sludge. If you find it your looking at replacing oil and EGR coolers. There are other way coolant can disappear, such as being expelled out the degas cap, any coolant hose.